how to set the timing on a single cylinder 4 stroke engine

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Vespa GTS Super Specification

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Filed Under (Vespa) by admin on 11-11-2010

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Gts super 300 ie Gts super 125 ie s 125cc s 50cc Gts 250 ie Gts 125cc LX 125cc LX 50cc 2 stroke Engine Single-cylinder, catalised, QUASAR 4 stroke, 4 valve electronic injection Single-cylinder LEADER 4 stroke with electronic injection Single-cylinder LEADER 4 stroke Single-cylinder HI-PER 2 stroke Single-cylinder, catalised, QUASAR 4 stroke, 4 valve electronic injection Single-cylinder, catalised, LEADER 4 stroke, 4 valve Single-cylinder LEADER 4 stroke Single-cylinder HI-PER 2 stroke Capacity 278cc 124cc 124cc 50cc 249cc 124cc 124cc 49cc Power 16.4 kW / 7500 rpm 10.5 Kw / 9500 rpm 7.65 Kw / 8250 rpm 3.2 Kw / 7500 rpm 15.7 Kw / 8500 rpm 7.65 Kw / 8250 rpm 7.65 Kw / 8250 rpm 2.5 Kw / 8500 rpm Max Torque 22Nm / 6500 rpm 12 Nm / 8000rpm 9.6 Nm / 7250 rpm 4.4 Nm / 6500 rpm 20.1 Nm / 6500 rpm 9.6 Nm / 7250 rpm 9.6 Nm / 7250 rpm 3.3 Nm / 6500 rpm Cooling Liquid Liquid Forced Air Forced Air Liquid Liquid Forced Air Forced Air Starter Electric Electric Electric and kick starter Electric and kick starter Electric Electric Electric and kick starter Electric and kick starter Transmission Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Front Suspension Single arm, dual chamber hydraulic shock absorber with coaxial spring Single arm link with coil spring and double hydraulic shock absorber Single arm link with coil spring and double hydraulic shock absorber Single arm link with coil spring and double hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Rear Suspension Two dual effect shock absorbers with adjustable preload Coil spring and double hydraulic shock absorber Coil spring and double hydraulic shock absorber Coil spring and double hydraulic shock absorber Twin hydraulic shock absorbers with preload adjuster Twin hydraulic shock absorbers with preload adjuster Hydraulic shock absorbers with preload adjuster Hydraulic shock absorber Front Brake ø 220mm disc brake 220mm disc brake ø 200mm disc brake ø 200mm disc brake ø 220mm disc brake ø 220mm disc brake ø 200mm disc brake ø 200mm disc brake Rear Brake ø 220mm disc brake 220mm disc brake ø 110mm drum brake ø 110mm drum brake ø 220mm disc brake ø 220mm disc brake ø 110mm drum brake ø 110mm drum brake Front Tyre Tubeless 120/70-12″ Tubeless 120/70 – 12″ Tubeless 110/70 – 11″ Tubeless 110/70 – 11″ Tubeless 120/70-12″ Tubeless 120/70-12″ Tubeless 110/70 – 11″ Tubeless 110/70-11″ Rear Tyre Tubeless 130/70-12″ Tubeless 130/70 – 12″ Tubeless 120/70 – 10″ Tubeless 120/70 – 10″ Tubeless 130/70-12″ Tubeless 130/70-12″ Tubeless 120/70 – 10″ Tubeless 120/70-10″ Running weight 158kg 158kg 114kg 96kg 151kg 145kg 114kg 96kg Length/Width/Height 2230mm / 755mm / 1170mm 1930mm / 755mm / 1930mm 1770mm / 740mm / 1140mm 1755mm / 740mm / 1140mm 1930mm / 755mm / 1170 mm 1940mm / 755mm / 1180 mm 1770mm / 740mm / 1140mm 1755mm / 740mm / 1140mm Fuel Tank Capacity 9 litres 9 litres 8.5 litres 8.5 litres 9.2 litres 10 litres 8.5 litres 8.5 litres Emmissions Euro 3 Euro 3 Euro 3 Euro 2 Euro 3 Euro 3 Euro 3 Euro 2 Colours Rosso Dragon Nero Lucido Montebianco Rosso Dragon Nero Lucido Montebianco Taormina Nero Lucido Montebianco Taormina Nero Lucido Montebianco Marrone Terra Di Toscana Bronzo Perseo Nero Vulcano Blu Midnight

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ULTIMA IGNITION MODULE AND KIT INSTALLATION MANUAL FOR HARLEY DAVIDSON

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Filed Under (Harley Davidson) by admin on 03-03-2011

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Disconnect battery. 2. Mark location of timing plate in relation to inside of cam cover. This will give a starting point for timing on new module. Remove old ignition if applicable (see manual) Clymer, Haynes. 3. If your bike is not equipped with timing rotor M/W# 53-528 OEM#32402-83 you must buy one (included in kit). Also a single fire coil is needed (included in kit) M/W# 53-632. Any single fire coil rated 2-4 ohms can be used. NO SOLID CORE PLUG WIRES (copper, silver) they will damage the unit. 4. Install module: helpful hints, early model nose cones, i.e. Shovel Heads, the hole for the wire may need to be drilled out. Align with previously scripted mark for timing. Use lockwashers for stand offs for correct clearance of cover plate. Run wire loom. 5. Connect wires, see wiring diagram. Tape unused wires, green or brown. 12v to tach (brown) will damage module. Set timing. 1996 and later should not be timed 20˚ BTDC as the OEM module, but at 35˚ BTDC. Use this mark when using timing light. If VOESswitch is not used you must ground VOES wire (green) while timing. Refer to manual for correct identification of timing marks. At start up and timing, set spark advance in middle position. FUNCTION SWITCHES LED timing indicator light: When out, shows TDC. When ignition is on, LED will light up. When engine is cranking LED will blink. Electric Start/Kickstart: Set accordingly. VOES/Race mode: VOES switch lets the motor run smoother and improves gas mileage. If you don’t use it or add one tape up green wire and switch to race. VOES switch to use, M/W# 53-652. Spark advance: High compression motors should use race mode and 93 octane or better gas. Changing from VOES to race changes advance curves. Agood rule of thumb is if the engine knocks when throttle is applied in high gear, turn back spark advance curve until it stops engine knock. RPMlimiter: Set at desired RPM to cut engine power. Rear Cylinder: This is for racing and should be set at a dyno. +/-5˚. Rear cylinder timing is achieved through this adjuster. Most should dial to middle setting and leave alone. After all switches are set, install cover with supplied gasket and feel the increased performance of a solid state single fire ignition. Again, we remind you, if you don’t feel confident about installing this unit, let a qualified mechanic do it and be assured you are getting the best performance and gas mileage possible.

4-STROKE TRIUMPH SINGLE CYLINDER MOTORCYCLES ELECTRONIC IGNITION SYSTEM INSTALLATION INSTRUCTIONS

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Filed Under (Triumph) by admin on 27-10-2010

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1. Remove the petrol tank (and seat if necessary) to gain access to the ignition coil, condensor and wiring. 2. For safety, disconnect the battery, if fitted (preferably both terminals). 3. Remove the spark plug. 4. Remove the alternator rotor cover (if fitted). 5. Loosen the auto-advance centre bolt. Rotate the engine to the correct full advance timing position for your machine (see table on page 6), using one of these methods: • Models from 1967 on: use the marks provided for strobe timing on the rotor & chaincase (inside the rotor cover). Unless these marks are known to be accurate it is recommended that they are checked for correct alignment. These marks should line up at the full advance position, check using one of the methods below and, if necessary, re-mark the rotor. • Models from 1969 on: use the timing plug on the left-hand crankcase • Use a degree disc on the crankshaft / camshaft (see table on page 6) • Use a dial guage down the spark plug hole (see table on page 6) 5. Remove kickstart, gear lever and outer timing cover. 6. Remove the contact-breaker plate and lead from the outer timing cover. 7. Taking the ignition trigger assembly, insert a small cable tie into the two holes in front of the connector block on the ignition trigger. This will be used later to secure the two wires to the plate. 8. Fit the ignition trigger plate with the adjustable slots at approx. 6 & 12 o’clock, using the original pillar fixings & washers, positioned in the centre of the slots (to allow for adjustment in either direction). Handle the trigger with care. • RED EARTHING WIRE • CRIMP CONNECTORS & INSULATORS • LARGE & SMALL CABLE TIES • CABLE TIE ADHESIVE MOUNTING BASE 3
9. Remove the centre bolt securing the auto-advance unit. Remove the complete auto-advance unit with an extractor bolt or by tapping it gently sideways. 10. Fit the magnetic rotor in place of the auto-advance unit, with the magnets/ red marks positioned at approx. 3 & 9 o’clock. The magnetic rotor has a male taper which fits into the taper in the end of the camshaft. There is no keyway, allowing it to be fitted in any desired position. 11. Using the ¼” washer and the appropriate bolt (UNF or BSF), pass the bolt through the centre of the magnetic rotor and into the thread in the camshaft. Finger tighten only at this stage. The magnetic rotor centre thread (metric M8) is provided for attaching a puller, if the rotor should need to be removed for engine servicing, etc. 12. Replace the outer timing cover, gear lever & kickstart. 13. Check that the engine is still at the correct full advance position, then adjust the magnetic rotor position so that one of the red marks is centrally behind the static timing hole at 9 o’clock (see fig. 4, page 7). If your machine’s camshaft rotates clockwise, refer to fig. 3. Gently tap the rotor into the taper & tighten the centre bolt, using a 3/16″ allen key. WIRING: 14. All connections must be of the highest quality, use crimped or soldered connections; twisted wires will not give a satisfactory operation. Avoid coiling up surplus lead.

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KTM 60 SX / 65 SX REPAIR MANUAL ENGINE

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Filed Under (KTM) by admin on 12-11-2010

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Carburetor adjustment Basic information about the original carburetor setting The original carburetor setting was adapted for an altitude of approx. 500 meters (1600 ft.) above sea level, and the ambient temperature of approx. 20°C (68°F), mainly for off-road use and central European premium-grade fuel (ROZ 95). Mixing ratio 2-stroke motor oil : super fuel 1:40 . Basic information of changing the carburetor setting Always start out from the original carburetor setting. Essential requirements are a clean air filter system, air-tight exhaust system and an intact carburetor. Experience has shown that adjusting the main jet, the idling jet and the jet needle is sufficient and that changes of other parts of the carburetor will not greatly affect engine performance. RULE OF THUMB: high altitude or high temperatures  choose leaner carburetor adjustment low altitude or low temperatures  choose richer carburetor adjustment * WARNING * -ONLYUSE PREMIUM – GRADE GASOLINE ROZ 95 MIXED WITH HIGH – GRADE TWO – STROKE ENGINE OIL . OTHER TYPES OF GASOLINE CAN CAUSE ENGINE FAILURE , AND USE OF SAME WILL VOID YOUR WARRANTY . -ONLYUSE HIGH – GRADE 2- STROKE ENGINE OIL OF KNOWN BRANDS ( I . E .SHELL ADVANCE RACING X). -NOTENOUGH OIL OR LOW – GRADE OILCAN CAUSE EROSION OF THE PISTON . USING TOO MUCH OIL , THE ENGINE CAN START SMOKING AND FOUL THE SPARKPLUG . -INTHE CASE OFA LEANER ADJUSTMENT OF THE CARBURETOR PROCEED CAUTIOUSLY . ALWAYSREDUCETHEJETSIZEINSTEPSOFONENUMBERTOAVOID OVERHEATING AND PISTON SEIZURE . NOTE: If despite a changed adjustment the engine does not run properly, look for mechanical faults and check the ignition system. Basic information on carburetor wear As a result of engine vibrations, throttle valve, jet needle, and needle jet are subjected to increased wear. This wear may cause carburetor malfunction (e.g., overly rich mixture). Therefore, these parts should be replaced after 1000 hours of using. Idling range – A Operation with closed throttle valve. This range is influenced by the idle adjusting screw 1 . Only make adjustments when the engine is hot. The idling speed can be changed by turning the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Opening up – B Engine behavior when the throttle opens. The idle jet and the shape of the throttle valve influences this range. If, despite good idling-speed and part-throttle setting, the engine sputters and smokes when the throttle is fully opened and develops its full power not smoothly but suddenly at high engine speeds, the mixture to the carburetor will be too rich, the fuel level too high or the float needle is leaking. Part-throttle range – C Operation with partly open throttle valve. This range is only influenced by the jet needle (shape and position). The optimum part-throttle setting is controlled by the idling setting in the lower range and by the main jet in the upper range. If the engine runs on a four-stroke cycle or with reduced power when it is accelerated with the throttle partly open, the jet needle must be lowered by one notch. If then the engine pings, especially when accelerating under full power at maximum engine revs, the jet needle should be raised. If these faults should occur at the lower end of the part throttle range at a four-stroke running, make the idling range leaner; if the engine pings, adjust the idling range richer

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HARLEY DAVIDSON XLH 1200cc BIG BORE KIT INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 06-03-2011

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Boring and Honing Procedures 1. Check again for burrs on cylinder gasket surfaces and remove burrs before performing Step 2. 2. Install original head and base gaskets, CYLINDER TORQUE PLATES (Part Number 33446-A) and TORQUE BOLTS (Part Number 33446-4). Tighten TORQUE BOLTS following tightening procedure given in the INSTALLATION, CYLINDER HEAD procedure in the ENGINE section of the Service Manual. NOTE Torque plates, properly tightened and installed with gaskets, simulate engine operating conditions. Measurements will vary as much as 0.001 inch without torque plate. 3. The cylinder must be bored with gaskets and torque plates attached. Bore the cylinder to 0.003 inch under the desired finish size. 1 WARNING CAUTION CAUTION 1 WARNING Kit Number 4. Hone the cylinder to its finished size (See Figure 1) using a 280 grit rigid hone followed by a 240 grit flexible ball hone. Honing must be done with torque plates attached. All honing must be done from the bottom (crankcase) end of the cylinder. Work for a 60 degree crosshatch pattern. 5. See Figure 1. After machining and honing, chamfer the bottom edge of the cylinder liner. the chamfer provides a beveled surface for easier installation of the cylinder over the piston rings. Break leading edge of liner to a flat surface. The bottom edge of the liner will be somewhat sharp after machining. This sharp edge could easily be damaged during installation of the cylinder. Piston Installation The 1200cc pistons have an arrow on the top of the piston. This arrow must face the front of the engine when piston is installed. There is no front cylinder piston or rear cylinder piston. New pistons can be installed in either cylinder. Check piston rings for proper side clearance and end gap (See XLH Service Manual). Be sure end gaps of adjacent rings are installed 90 degrees apart. Assembly Follow assembly and torque specifications given in the ENGINE section of the applicable Service Manual. Replace original gaskets, O-rings and seals with new components furnished in kit. NOTE Push rod covers on 1991 and later models are one-piece and the correct O-rings are as follows: Bottom – Part Number 17944-89 Upper – Part Number 11190 Engine Break In For the first 500 miles, to wear-in critical parts, observe these few simple driving rules: During the first 50 miles, keep the engine speed below 2500 RPM in any gear. Up to 500 miles, vary the engine speed, avoiding any steady speed for long distances. Engine speed up to 3000 RPM is permissible in any gear. Avoid fast starts at wide open throttle. Drive slowly until engine warms up. Avoid running the engine at extremely low RPM in higher gears. 2 of 3 -J00001 1200cc CYLINDER FINAL BORE SIZE AFTER HONING STANDARD BORE DIAMETER 3.4980 inch + 0.0002 inch Figure 1. Bottom Edge of Cylinder Liner Chamfer i04852 Break Edge to Flat Surface

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TRIUMPH 750 BIG BORE CYLINDER AND PISTON SET FOR 650 TWINS INSTALLATION

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Filed Under (Triumph) by admin on 29-10-2010

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Step 1. Unpack your big bore kit and inspect the contents. There should be the following: 1. Cylinder x l 2. piston with wristpin x 2 3. Hepolite piston ring set x l 4. Special big bore head gasket Step 2. Thoroughly wash the cylinder bores with soap and water. Do not use solvent! Dry bores with air or a lint free towel and let completely air dry. This step is most important and will greatly extend the life of the pistons. Step 3. Following the procedure outlined in your service manual, drain the fuel tank, remove the exhaust system, fuel tank and carburetors. Have a catch basin handy to capture any fuel that may spill from the carburetors, as fuel is highly flammable and can be ignited by a dryer pilot light etc. from a long distance. Clean up any spilled fuel immediately and dispose of away from any source of ignition. Store the fuel tank in a well vented area, outdoors is best, in the event your fuel taps should leak. Step 4. Remove the rocker boxes by slacking the 9 head bolts a little at a time in a star pattern. Remove the 6 nuts at the front and back of the head. Remove the 4 corner rocker box bolts. Remove the head bolts and rocker boxes. Remove the push rods. Examine the push rods to insure they are straight and the ends are tight. Replace any suspect push rod. Step 5. Remove the cylinder head. Now would be a good time for guide and valve renewal. This is best left to an expert. More cylinder heads have been ruined by auto machine shops than by hard use. If you do not have a qualified shop in your area please call for a referral. Step 6. Remove the push rod tubes and the cylinder base nuts. Clip rubber bands around the top of the lifters to keep them from dropping into the crankcase. Have a few lint free rags handy. Bring the pistons to the top of the stroke and begin lifting off the cylinder. If the cylinder is hard to lift off, thread a nut on one of the base studs and use a tire lever to pry against the bottom fin close to its base using the stud as a fulcrum. After partially raising the cylinder stuff the crankcase mouth with rags to keep any carbon or broken rings from entering the crankcase. These will remain in place until step 12. Step 7. Leaving the rags in the crankcase remove the wrist pin circlips from the pistons and discard. Heat the piston and gently push the wrist pin out. Do not use force as this can damage the connecting rod or its bearings. Be sure to account for all the clips as one left in the crankcase can do extensive damage. Step 8. Clean all gasket surfaces to remove any traces of the old gaskets. Use Pennatex gasket remover if needed. Be very careful not to scratch the gasket surface or to allow any gasket particles to enter the crankcase. Even a small bit of gasket can stop the oil pump from working! Step 9. Note the direction and location of the lifters. These must be replaced in the same position as when removed. Remove the lifter blocks from the old cylinder. Start by removing the small retaining bolts and washers. The lifter blocks are extremely fragile and are easily broken. They are also very expensive so great care must be taken in this step! Triumph special tool 222-616008 is advisable here. Apply pressure to the center of the block only. Do not press against the tangs that locate the lifter! A tool can be fabricated using two dowels to locate in the lifter holes. Step 10. Clean and examine the lifters and camshaft faces. Clean the lifter blocks and remove the sealing oring under the locating flange. Replace these with the new orings in the gasket set. Apply a smear of gasket sealant to the lifter block oring and press into the new cylinder. Be sure the lifter block is parallel with the bores and the grooved block is on the exhaust side. Apply a small amount of assembly oil to the lifters and replace in the exact position they came from

2004 Honda CRF450R OWNER'S MANUAL

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Filed Under (Honda) by admin on 21-11-2010

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motorcycle can be kickstarted with the transmission in gear by disengaging the clutch before operating the kickstarter. Check the engine oil, transmission oil and coolant levels before starting the engine (page 21, 23, 24). Cold Engine Starting: 1. Turn the fuel valve ON. 2. Shift the transmission into neutral. 3. If the temperature is 35°C (95°F) or below, pull the choke knob fully out. 4. If the temperature is below 0°C (32°F), open the throttle two or three times. (The engine requires a richer mixture for starting in cold weather. When the throttle is so opened, the accelerator pump will feed extra fuel to the cylinder, thereby facilitating starting in cold weather.) 5. With the throttle closed, operate the kickstarter starting from the top of the kickstarter stroke, kick through to the bottom with a rapid, continuous motion. (Do not open the throttle, As the carburetor is equipped with an accelerator pump, excessive fuel will be charged into the engine, and the spark plug will be fouled if the throttle is opened and closed repeatedly. Excessive fuel in the engine makes kick- starting difficult.) 6. About a minute after the engine starts, push the choke knob back all the way to fully OFF. If idling is unstable, open the throttle slightly. (1) FUEL FILL CAP (2) BREATHER TUBE WARNING (1) FUEL VALVE (2) CHOKE KNOB Warm Engine Starting: 1. Turn the fuel valve ON. 2. Shift the transmission into neutral. 3. Pull the hot start lever and kick-start the engine. (Do not open the throttle.) 4. As soon as the engine starts, release the hot start lever 1. Shift the transmission into neutral. 2. Pull the hot start lever and kick-start the engine. (Do not open the throttle.) 3. As soon as the engine starts, release the hot start lever. Starting the engine excessively charged with fuel by throttle blipping or other reasons: 1. Shift the transmission into neutral. 2. With the throttle fully opened, repeat kickstarter operation approximately 10 times very slowly to discharge excessive fuel from the engine. 3. Pull the hot start lever and kick-start the engine (Do not open the throttle.) 4. As soon as the engine starts, release the hot start lever. Stopping The Engine 1. Shift the transmission into neutral. 2. Turn the fuel valve OFF. 3. Lightly open the throttle 2 – 3 times, and then close it. 4. Depress and hold the engine stop button until the engine stops completely. NOTE: • Failure to close the fuel valve may cause the carburetor to overflow. (1) THROTTLE GRIP (2) ENGINE STOP BUTTON Break-In Procedure Help assure your CRF’s future reliability and performance by paying extra attention to how you ride during the first operating day or 15 miles (25 km). During this period, avoid full-throttle starts and rapid acceleration. This same procedure should be followed each time when: • Piston is replaced • Rings are replaced • Cylinder is replaced • Crankshaft or crank bearing are replaced

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HARLEY DAVIDSON CHROME BILLET LIFTER-COVER KIT REMOVAL AND INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 25-02-2011

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Installation with Stock Pushrods Refer to the service manual for your motorcycle model. Installation with Adjustable Pushrods Lifter-Cover Removal Installing or removing the pushrods with the valve train loaded can result in engine damage. On the cylinder being serviced, always set the lifters to the base circle on the cam before servicing pushrods, lifters, rocker arms, and valves. 1. Set the lifters of the rear cylinder to their lowest point, or base circle, on the cam. Refer to Setting the Lifters to the Base Circle in this instruction sheet. 2. See Figure 1. Insert a screwdriver into the slot on the side of the spring-cap retainer on the pushrod cover. 3. Press the spring-cap and retainer down while pulling outward to remove the spring-cap retainer. 4. See Figure 2. Lift the lower pushrod cover to reveal the lower third of the pushrod. 5. If the engine has stock pushrods installed and you are installing adjustable pushrods with this lifter-cover installation, go to step 6. If the engine already has adjustable pushrods installed and you are installing adjustable pushrods with this lifter-cover installation, go to step 7 6. Use a bolt cutter or similar tool to cut the stock pushrod. Avoid cutting the pushrods with a saw, grinder, or other method that may allow metal debris into the engine. Go to step 8. 7. Loosen the jam nut on each adjustable pushrod and resize each rod to its shortest length. 8. Remove the pushrod covers and pushrods from the engine. 9. Remove the O-rings from the seats in the engine at the top and bottom of the pushrod cover. 10. Remove the four screws fastening the lifter cover to the engine to remove the cover and gasket. 11. Remove old lifter-cover gasket material from the engine, taking care not to allow material to fall into the engine. Continue to Lifter-Cover Installation in this I-Sheet. Lifter-Cover Installation 1. See Figure 3. Verify that the lifter anti-rotation pin is in position. Installing or removing the pushrods with the valve train loaded can result in engine damage. On the cylinder being serviced, always set the lifters to the base circle on the cam before servicing pushrods, lifters, rocker arms, and valves. 2. Verify that the cylinder lifters are set to their lowest point, or base circle, on the cam. Refer to Setting the Lifters to the Base Circle in this instruction sheet. 3. Fasten the new lifter-cover gasket and chrome billet lifter cover to the engine using the chrome screws from this kit. In a cross pattern, torque the lifter-cover screws to 90 – 120 in-lbs (10.2 – 13.6 Nm). 4. See Figure 4. Loosen the jam nut on all of the pushrods and adjust the pushrods to their shortest length. NOTE See Figures 4 and 5. Install the narrow-band pushrods in the cylinder-intake location. Install the wide-band pushrods in the cylinder-exhaust location. 5. Assemble the O-rings (purchased separately) and pushrod covers. 6. Install the pushrods with the pushrod covers. The adjustment-end of the pushrod must be on the lifter

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2003 Ducati ST4s Timing Belt Adjustment

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Filed Under (Aprilia) by admin on 31-10-2010

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This instruction on cam belt adjustment starts after you remove the fairing pieces. Plan on an hour to remove these. Since you are performing your own service, buying Ducati belts may not be that expensive. There may be another belt source, but I have not confirmed this for the 996 engine of the 02-03 ST4s. Fig 1 – ST4s ready for belt adj./ repl. Fig 2 – Crank tool installed. See dwg. 1) Ensure maximum of ½ tank of gas. Fuel will leak into the charcoal canister, then onto the floor if the tank is over half full and the tank is tilted up on its hinge. So put the tank up on its hinge. 2) Remove spark plugs. Cover sparkplug wells with boots or rags. This is a great time to toss out those Champions for a set of NGK DCPR8E’s. 3) Remove the front shield from the horizontal cylinder head. 4) Remove crankshaft cover on Riders LH side and insert crank tool. A crank tool can be made by following the drawing at the end of this document. See Fig 2 above. The flat head screws used are kind of soft so beware on their removal. 5) Remove oil pressure sending unit cable and remove oil sending unit. No oil should pour out. 6) Remove battery and remove bolts fastening battery box to engine/frame. You can let the battery box dangle or partially support it via a bungee cord. Be careful of the cable on the ground of the ECU. By dangling the battery box excess stress could be placed on this cables connector and you don’t want to troubleshoot an intermittent electrical issue. 7) Remove cam belt covers. The two covers over the cams are real easy. The center piece is removed by pulling it down. You may have to move some hoses and cables out Timing belt adj. doc 1
of the way because it is a tight fit. Removing the oil pressure sending unit gave clearance for the removal. Fig 1 shows bike ready to be worked on. On the Rider’s LH is a window on the case cover. Using a flashlight to illuminate the area, marks can be rotated into view using the engine turning tool. There are two marks denoting the TDC of each of the cylinders. When a mark in the window aligns with the pointer, look at the crank driving pulley on the Rider’s RH of the engine. If the driving pulley’s mark is aligned with the pointer on the engine case, you are at TDC horizontal cylinder. If the pulley mark and the pointer on the engine do not align, rotate the engine until the mark in the window on the Rider’s LH side case cover aligns as well as the pulley’s mark and the engine’s pointer. Fig 3 shows the engine pulley and pointer. You can check that the horizontal piston is at TDC by inserting a welding rod into the spark plug well and touch the top of the piston with it to sense its position. Timing marks on cam pulleys are clearly stamped on all four pulleys. When the crank driving pulley aligns with its corresponding pointer on the engine case and the marks on the pulleys align with their corresponding marks on both cylinders, you are in position for belt adjustment and replacement

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2009 GAS GAS TXT PRO TECHNICAL SPECIFICATIONS AND OWNER'S MANUAL

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Filed Under (Gas Gas) by admin on 28-11-2010

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ENGINE 2 stroke, single cylinder, direct reed valve crankcase induction. Liquid cooled. 125 cc. engine Cylinder size 124,8 cc. Bore and stroke 54 x 54.5 mm. 200 cc. engine Cylinder size 175,3 cc. Bore and stroke 64 x 54,5 mm. 250 cc. engine Cylinder size 247,7 cc. Bore and stroke 72,5 x 60 mm. 280 cc. engine Cylinder size 272,2 cc. Bore and stroke 76 x 60 mm. 300 cc. engine Cylinder size 294,1 cc. Bore and stroke 79 x 60 mm. Carburettor, diameter of the diffusor 26 Lubrication system Mixture (50:1)(2%) Ignition system Digital magnetic flywheel CDI TRANSMISSION Transmission type 6 gears, Four / Six system by GAS GAS* (Patented). Clutch type Hydraulic command, 1/3 discs, variable progressive with diaphragm system by GAS GAS* (Patented). Driving system By chain Gear ratio 1st. 2,996 (35x27x28/16x24x23) 2nd. 2,571 (36/14) 3th. 2,187 (35/16) 4st. 2,112 (36x23x24/14x28x24) 5st. 1,125 (27/24) 6th. 0,821 (23/28)
-11- Primary reduction ratio 2,777 (75/27) Final reduction ratio 3,818 (42/11) Overall drive ratio 8,704 (6th. gear) Transmission oil Capacity 550 cc. Type 10W40 API SF o SG. FRAME Type Tubular profile made with Cr-Mo. Tyres Front 2,75 x 21″ Trial Rear 4,00 x 18″ Trial tubeless. Suspension Front Adjustable tele-hydraulic fork ø 40 mm. (125 / 200). Adjustable tele-hydraulic fork ø 40 mm with aluminium bars (250 / 280 / 300) Rear Variable progressive system with mono-shock multiadjustable. Suspension stroke Front 177 mm. Rear 164 mm. Front fork oil SAE 5. Front fork oil level ø 40 mm.(125 / 200) 180 mm. air chamber steel bar ø 40 mm. (250 / 280 / 300) 160 mm. air chamber aluminium bar BRAKES Type Disc brake. Disc diameter Front ø185 mm. 4 piston calipers. Rear ø150 mm. 2 piston calipers. DIMENSIONS Overall height 1180 mm. Overall width 820 mm. Seat height 650 mm. Ground clearance 315 mm. Wheelbase 1330 mm. Fuel tank capacity 3,1 liters.

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