vulcan 1500 idle adjust

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Ural carburetors Installation and idle adjustment

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Filed Under (Ural) by admin on 02-11-2010

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1. First you must adjust the idle. It is acceptable per the manual to adjust the idle by using the idle adjust screws (11). This usually involves screwing them then backing out 1 to 1.5 turns. Or you can adjust looking at the sliders 2. If installing the carburetors: a. Remove the cover (2) b. Reomve the slider (3) c. Place the throttle cable through the guide (18) with the spring (4) on the cable. d. Route the cable through the slide catch (6) e. Insert the slide assembly into the chamber and make sure it easily slides up and down. Direct the needle (8) into the opening of the diffuser (angled side visible). f. Screw assembly together and verify via throttle movement that slide moves freely. Attach fuel delivery lines to (12). 3. Using the idle set screw (11) raise the slider so the lower edge is 1-2 mm. 4. Assemble to engine using the proper gaskets (paper – felt – paper). 5. Using the locknut (26) adjust the free play of the throttle cable (2-3 mm) 6. Adjust the idle mixture screw – turn in completely then out 1 to 1.5 turns 1. Remove one of the spark plug caps, and with the cap shorted, adjust (11) to decrease RPM’s to a point of being minimally steady. 2. Adjust the mixture (15) out until RPM’s decrease. Turn in until RPM’s increase slightly. Then turn in screws ¼ to 1/3 revoultion. 3. Do the same for the second carburetor with the first spark plug cap shorted. 4. With both cylinders, adjust each idle (11) on each carburetor the same amount each until it’s at a steady, minimal RPM. Use small changes. (at this point you can use your airflow tool to check). 5. Sharply increase, then decrease throttle. Then engine must return to low RPMs smoothly. If the engine goes below limits, readjust (11) from step 4. Synchronization of the K68 Note: Rather than using the opposite cylinder shorted to test the pull of the live cylinder carburetor, you can use something like a Twinmax connected to the test ports (27 Fig 1). Or, if you have a model without these ports, use a Synchrometer (Appendix 2) held against the face of the carburetor. These tools merely show airflow passing through each carburetor (which is dependent on the position and wear on the slide). If using these tools, it’s not necessary to do the following steps. You wil want to use a throttle guide (Appendix 1), to show airflow at various throttle settings. Using the flow meter of your choice make sure each carburetor is the same at the various throttle settings. 1. Place the motorcycle on the center stand ensuring the rear wheel is suspended 2. Make sure you have large area to work with (safety issues here) 3. Shift into the highest gear with the engine running 4. Short one spark plug cap to the cylinder (using a nail or something in the fins) 5. Increase the speed to 40-50 km/hr 6. Fix the throttle using the throttle (maybe using a throttle stop screw under the throttle housing). 7. Reconnect other cylinder and using the opposite carburetor determine the speed which should be the same as the first. 8. Adjust the position of this slide to achieve the referenced speed using the locknut at the top of the carburetor.

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Adjusting the Pekar K68 for Dnepr or Ural

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Filed Under (Tips and Review) by admin on 11-11-2010

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1. Make sure the ignition timing is correct 2. Adjust the valves as necessary to ensure proper operation 3. Run the engine to warm it up a bit 4. Adjust the float setting. To do this, remove the carburetors (leave the throttle cables attached), remove the bowl and turn the carburetor upside down (fuel will spill). The float should look like this: Adjust as necessary by bending the float support (#37 in Figure 1). Reinstall Installation and idle adjustment 1. First you must adjust the idle. It is acceptable per the manual to adjust the idle by using the idle adjust screws (11). This usually involves screwing them then backing out 1 to 1.5 turns. Or you can adjust looking at the sliders 2. If installing the carburetors: a. Remove the cover (2) b. Reomve the slider (3) c. Place the throttle cable through the guide (18) with the spring (4) on the cable. d. Route the cable through the slide catch (6) e. Insert the slide assembly into the chamber and make sure it easily slides up and down. Direct the needle (8) into the opening of the diffuser (angled side visible). f. Screw assembly together and verify via throttle movement that slide moves freely. Attach fuel delivery lines to (12). 3. Using the idle set screw (11) raise the slider so the lower edge is 1-2 mm. 4. Assemble to engine using the proper gaskets (paper – felt – paper). 5. Using the locknut (26) adjust the free play of the throttle cable (2-3 mm) 6. Adjust the idle mixture screw – turn in completely then out 1 to 1.5 turns. * Starting using the K68′s (cold weather) 1. Verify fuel flow. Apply choke (pull 52 in Fig1). 2. Using the ticklers (13) allow fuel to enter the bowl until fuel drains from (14) 3. With the ignition off, kick 1 or 2 times 4. Turn ignition on, and as soon as engine is warmed up (maybe sooner) push choke mechanisms to open choke Idle Adjustment (engine running and warm) 1. Remove one of the spark plug caps, and with the cap shorted, adjust (11) to decrease RPM’s to a point of being minimally steady. 2. Adjust the mixture (15) out until RPM’s decrease. Turn in until RPM’s increase slightly. Then turn in screws ¼ to 1/3 revoultion. 3. Do the same for the second carburetor with the first spark plug cap shorted. 4. With both cylinders, adjust each idle (11) on each carburetor the same amount each until it’s at a steady, minimal RPM. Use small changes. (at this point you can use your airflow tool to check). 5. Sharply increase, then decrease throttle. Then engine must return to low RPMs smoothly. If the engine goes below limits, readjust (11) from step 4. Synchronization of the K68 Note: Rather than using the opposite cylinder shorted to test the pull of the live cylinder carburetor, you can use something like a Twinmax connected to the test ports (27 Fig 1). Or, if you have a model without these ports, use a Synchrometer (Appendix 2) held against the face of the carburetor. These tools merely show airflow passing through each carburetor (which is dependent on the position and wear on the slide). If using these tools, it’s not necessary to do the following steps. You wil want to use a throttle guide (Appendix 1), to show airflow at various throttle settings. Using the flow meter of your choice make sure each carburetor is the same at the various throttle settings. 1. Place the motorcycle on the center stand ensuring the rear wheel is suspended 2. Make sure you have large area to work with (safety issues here) 3. Shift into the highest gear with the engine running 4. Short one spark plug cap to the cylinder (using a nail or something in the fins) 5. Increase the speed to 40-50 km/hr 6. Fix the throttle using the throttle (maybe using a throttle stop screw under the throttle housing). 7. Reconnect other cylinder and using the opposite carburetor determine the speed which should be the same as the first. 8. Adjust the position of this slide to achieve the referenced speed using the locknut at the top of the carburetor.

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KAWASAKI TERYX EFI Installation Instructions.

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Filed Under (Kawasaki) by admin on 08-02-2011

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Basic Tuning Adjustments 1. The following instructions are for basic fuel tuning. Modes 1,2, & 3 are allowing adjustments to increase and decrease the amount of fuel the engine needs. Modes 4 & 5 are for advanced tuning only. DO NOT change modes 4 & 5 when doing basic tuning! 2. To help understand how these modes work, you can think of them as if you were working with a carburetor. 3. Remember each time you push the MODE button you will be advancing to the next mode. Push the MODE button once and you are now in mode 1, push the MODE button again and you are now in mode 2 and so on. You only need to be concerned with modes 1, 2 & 3 for basic tuning. Modes 4 & 5 are for advanced tuning ONLY. 4. If you need to go back to the settings that were pre programmed when you purchased the controller, just look at the picture in each mode, the colored square represents where the settings were when you purchased the controller. 5. Looking at the controller you will see eight lights with numbers under them, this is what you need to look at when changing settings. The #1 light on the controller represents the leanest setting. TRINITY RACING DOES NOT TAKE REPONSIBLITY FOR DAMAGES THAT MAY OCCUR DURING OPERATION OF YOUR VEHICLE UNDER IMPROPER JET SETTINGS. IT IS THE FINAL RESPONSIBLITY OF THE OWNER/RIDER TO ADJUST JETTING TO SPECIFIC RIDING CONDITIONS AND ELEVATION BEFORE RIDING. WARNING! 1.877.FAS TOYS 2.Remove both seats 6. Re-install engine cover and seats. 6. Mode 1 green light represents idle & cruise adjustment (i.e. pilot jet). To adjust this setting push the MODE button once and then push the plus or minus buttons to adjust fuel as needed. 7. Mode 2 yellow light represents an additional amount of fuel added during acceleration (i.e. needle position). To adjust this setting, push MODE twice and then push the plus or minus buttons to adjust fuel as needed. 12 34 56 7 8 12 34 56 7 8 8. Mode 3 red light represents more fuel being added during full throttle (i.e. main jet). To adjust this setting push the MODE button three times and then push the plus or minus buttons to adjust fuel as needed. 9. If you are confident about your tuning skills and feel you need to adjust other parameters, see Advanced Tuning. 12 34 56 7 8 Advanced Tuning Adjustments 1. Advance tuning has two modes in which to adjust. They are called mode 4 and mode 5. In basic tuning, you are changing the amount of fuel that the engine receives, but with advance tuning, you will be changing when the fuel will be available. In each mode you can adjust how soon the fuel delivery occurs. 2. Mode 4 yellow light and blue light represent when the fuel delivery is available during partial throttle acceleration. To adjust this setting, push the MODE button four times and then push the plus or minus buttons to adjust fuel as needed. Only the yellow light will be changing.

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KAWASAKI VULCAN 1500, 1600, 2000 HANDLEBAR RISERS INSTALLATION INSTRUCTIONS

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Filed Under (Kawasaki) by admin on 25-10-2010

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1. Lay a blanket folded several times over the fuel tank to protect it. 2. Loosen (do not remove) from underneath, the two hex nuts holding the risers to the upper triple clamp. (Steering head) 3. Remove the four handlebar clamp bolts. (8mm allen wrench) While sitting on the motorcycle, pull the handlebars and upper clamp off of the risers. They may be slightly stuck and require some force to get free. Lay the handlebar and/or upper clamp/gauge assembly carefully on the blanket. 4. Remove the nuts and risers from the triple clamp. NOTE: Be careful not to scratch the upper triple clamp when installing the new risers. Assemble the supplied lock washers and flat washers onto the supplied bolts. Install the new risers onto the triple clamp and finger-tighten the bolts. 5. Re-install the handlebars and upper clamp/gauge assembly. Tighten the front bolts first closing the gap at the front, and then tighten the rear bolts. Tighten the two riser-mounting bolts securely. Check for adequate clearance and proper routing of cables and hoses.

KAWASAKI VULCAN 1500 PRO PIPE HS EXHAUST SYSTEM INSTALLATION MANUAL

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Filed Under (Kawasaki) by admin on 28-12-2010

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REMOVING THE STOCK EXHAUST SYSTEM 1. Remove the mufflers by loosening the pinch clamps on the front of each muffler. 2. Remove the muffler mounting bolt from the right side passenger footrest, slide the mufflers off and set them aside. Note: Save the mounting bolt, it will be reused for installation. 3. Loosen the pinch clamp on both front and rear head pipes, they’re located at the resonance chamber (the black box where the pipes meet). 4. Remove the two acorn nuts that mount the head pipe to the cylinder head. Remove the two piece header flange and set it aside. 5. Remove the front head pipe by rotating it down and pull it out of the resonance chamber. 6. Remove the two acorn nuts and flange from the rear head pipe. Remove the two bolts from either side of the resonance chamber and lower rear pipe and resonance chamber down and out and set it aside. 7. Remove the rubber grommets at the resonance chamber mounting points. INSTALLING YOUR NEW VANCE & HINES EXHAUST SYSTEM 1. Install the new mounting bracket (stamped 317) to the inside of the stock muffler mounting point (Refer to FIG. 1). 2. Unscrew all of the hose clamps (supplied) until they are completely loose. Mark the top edge of all three heat shields with the location of the mounting clips that are welded to the backside. Position the front heat shield over the head pipe and feed the tail end of the hose clamps into the clips. Be sure that each hose clamp is engaged with both clips. Repeat this step with the rear and collector heat shields. To facilitate the installation of the collector heat shield use a forward sliding motion from the rear of the collector. Do not force the collector heat shield directly onto the collector as damage to the heat shield will result. Note: the collector heat shield uses the 3/8″ wide clamps. 3. Rotate the hose clamps in the shields so that the screw drives are accessible. Tighten only finger tight at this time. Note: The screw end of the hose clamp should be accessible, but not visible when pipe is mounted on the bike. 4. Check to be sure that the stock exhaust gaskets are in good shape. If you have any doubts as to their condition, replace them. 5. Install the header with the heat shields attached, to the front and rear cylinders using the stock nuts and bolts. Leave them loose at this time. 6. Slide the chrome muffler clamp (supplied) onto the inlet end of the megaphone. Install the 5/16″ x 1 1/4″ bolt with a flat washer on either side of the clamp followed by the 5/16″ lock nut (hardware supplied). Leave the clamp loose at this time. 7. Slip the megaphone onto the head pipe collector, engaging the collector heat shield between the clamp and the outer slip joint tube. Slide one dog bone shaped nut plate under the bracket that

KAWASAKI 1500 CARB THUNDER Air Filter Kit Installation And removal Instruction

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Filed Under (Kawasaki) by admin on 25-10-2010

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1) Remove Seat 10mm KAW 1500 CARB ADPTOR QTY PARTS LIST 1 1500 CARB ADAPTOR 1 3″ PIECE OF HOSE 1 DOUBLE BARB 1 L-BARB 1 3/8″ RED PLUG 1 ¼” BLACK VACCUM PLUG 1 M6-1 NYLON INSERT LOCK NUT 3 M6-1 X 16 FLAT SOCKET HD CAP SCREW 1 170 MJ 1 INSTRUCTIONS 2) Remove Dash Plaque 8mm bottom Bolt only 3) Lift from bottom then Remove speedo cable 4) Disconnect Electric Plugs 5) Remove 12mm bolts holding tank 6) Turn petcock OFF – Pinch off fuel line. 7) Disconnect the electric Plug under speedo opening 8) Lift Tank at Rear – Disconnect two Vent Lines; Fuel gage Vent will Pull up – Remove. 9) Remove Chrome Air Cover. 10) Left side Remove two screws – 10mm bolt in side Air box. Pull hoses off Remove 1″ hose going to cross over Tube. 11) Remove two 8mm bolts on Bracket – Remove Bracket 12) Remove Screw on Top of air Box Snorkel 13) Remove both side covers 14) Remove air Backing plate right side (Crank Case Breather hose that connects to stock air box will connect to new) 15) Remove Bracket that holds Carb and holds Backing Plate 16) Take idle adjustable Knob loose – let hang loose 17) Take Choke Knob out of holding Bracket 18) Hose that went to cross over tube MAY BE PLUGGED OR VENTED your Choice (Fresh air unit) ** 98′S or any models with carb warmer should disconnect carb warmer by pinching off line on each side of connector that plugs into carb on bottom. Small bracket with one screw directly on the bottom of carb. 19) Loosen Clamp that holds Carb to intake Manifold, Carb will hang loose 20) Remove intake Manifold 5mm Allen- Remove crossover tube. 21) (- BE CAREFULL-) LINE IT UP RIGHT- Replace intake Manifold (YOU MAY TO SEAL THIS WITH A SEALER LIKE PERMATEX) ( BE SUPER CAREFUL TO KEEP INTAKE COVERED DURING EACH STEP. SCREWS CAN FALL ONTO INTAKE) 22) Drain Float Bowl 3mm allen – very bottom of carb 23) Remove Float Bowl 4 screws (#2 Phillips) let hang down 24) Remove main jet, if Emulsion tube comes out use 8mm and Flat tip to separate jet from Emulsion tube. 25) Install with new jet 26) CAREFULLY Reinstall Float Bowl Cover 27) If installing Needle Remove Top Cover of Carb, Carefully pull the slide out. ( BE CAREFUL WITH DIAPHRAM) Remove Spring + Needle Install new Needle (WE RECOMMEND THE 3RD CLIP FROM TOP WITH TWO WASHERS ON TOP. REINSTALL 28) Be sure to reseat diaphragm – BE CAREFUL Reinstall Cover. 29) Install Carb to Intake – reconnect carb warmer if applicable 30) Reattach idle adjustment 31) Reattach Choke 32) Reattach Bracket in front of Carb- 33) Take Center bolt mount Rubber Gromlet from Stock Air box Plate install in to new Air box Adapter use stock Bolt, Attach to Bracke

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HARLEY DAVIDSON MULTI-FIT BRAIDED THROTTLE/IDLE CABLE KITS REMOVAL AND INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 20-03-2011

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REMOVAL To prevent accidental vehicle start-up, which could cause death or serious injury, disconnect negative (-) battery cable before proceeding. (00048a) To prevent accidental vehicle start-up, which could cause death or serious injury, remove main fuse before proceeding. (00251b) 1. Disconnect battery cables, negative (-) cable first or remove the main fuse following the instructions in the service manual. NOTE When performing cable disassembly procedures, make careful notes as to the existing cable routing. Pay special attention to existing cable strap locations before removing so new straps can be installed in the same locations. Do not remove or install the master cylinder assembly without first positioning a 5/32-inch (4 mm) thick insert between the brake lever and lever bracket. Removing or installing the master cylinder assembly without the insert in place may result in damage to the rubber boot and plunger on the front stoplight switch. (00324a) 2. See Figure 1. Place the cardboard insert between the brake lever and lever bracket. 3 2 1 is00825 1. Brake lever 2.5/32 inch (4 mm) cardboard insert 3. Brake lever bracket Figure 1. Install Cardboard Insert 3. See Figure 2. Loosen cable adjuster jam nuts. Turn cable adjusters in until they are as short as possible. This will provide enough slack for easy removal. 3 4 1 2 5 is 02071 1. Upper switch housing 2. Lower switch housing 3. Throttle cable adjuster 4. Idle cable adjuster 5. Adjuster jam nut Figure 2. Handlebar Throttle Control 4. Remove the right upper and lower switch housing screws. 5. Loosen the upper screw securing the handlebar clamp to the master cylinder housing. Remove the lower clamp screw and flat washer. NOTE If possible, leave the friction shoe in place. The friction shoe is a loose-fit and may fall out or become dislodged if the lower switch housing is turned upside down or shaken. 6. See Figure 3. Remove the brass ferrules from the notches on the inboard side of the throttle control grip. Remove the ferrules from the cable end fittings. 1 2 4 3 is 02072 1. Throttle cable 2. Idle cable 3. Brass ferrule 4. Notch Figure 3. Throttle/Idle Control Cables 7. Pull the crimped inserts at the end of the throttle and idle control cable housings from the lower switch housing. For best results, use a rocking motion while pulling. Remove cables with retaining rings from switch housing. Apply a drop of light oil on the retaining ring, if necessary, to help in removal. NOTE If installing different handlebars, measure the change in distance that will be required from the end of the cable housing to the throttle grip. Compare this additional required length to the cables provided in the kit. If the cables are more than 2.0 inches (51 mm) longer or more than 1.0 inch (25 mm) shorter than the above measured distance, see a Harley-Davidson dealer for the correct cable length. Install proper length throttle cables. Incorrect cable length can adversely affect motorcycle operation, which could cause loss of control resulting in death or serious injury. (00396b) 8. Follow instructions in the applicable service manual and remove air cleaner and backplate.

HARLEY DAVIDSON MULTI-FIT BRAIDED THROTTLE/ IDLE CABLE KITS REMOVAL AND INSTALLATION INSTRUCTIONS

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Filed Under (Harley Davidson) by admin on 01-02-2011

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REMOVAL To prevent accidental vehicle start-up, which could cause death or serious injury, disconnect negative (-) battery cable before proceeding. (00048a) 1. Disconnect battery cables, negative (-) cable first or remove the main fuse following the instructions in the service manual. NOTE When performing cable disassembly procedures, make careful notes as to the existing cable routing. Pay special attention to existing cable strap locations before removing so new straps can be placed into the same locations. Do not remove or install the master cylinder assembly without first positioning a 5/32-inch (4 mm) thick insert between the brake lever and lever bracket. Removing or installing the master cylinder assembly without the insert in place may result in damage to the rubber boot and plunger on the front stoplight switch. (00324a) 2. See Figure 1. Place the cardboard insert between the brake lever and lever bracket. 3. See Figure 2. Loosen cable adjuster jam nuts. Turn cable adjusters in until they are as short as possible. This will provide enough slack for easy removal. 4. Remove the right upper and lower switch housing screws INSTALLATION Throttle and Idle Cable Installation 1. See Figure 3. Apply graphite lightly to the throttle grip inside the switch housing and on the throttle end of the handlebar. NOTE The throttle control cable has a larger diameter retaining ring crimped to the cable end than does the idle control cable. For assembly, apply a drop of light oil on the retaining rings of the crimped inserts. 2. See Figure 7. Push the throttle cable housing and retaining ring into the larger hole of the switch housing, located in front of the tension adjuster screw. 3. Push the idle cable housing and retaining ring into the smaller hole of the switch housing, located behind the tension adjuster screw. 4. Push the throttle and idle control cable housings into the lower switch housing until each snaps into place. NOTE For models not equipped with factory-installed cruise control, if the friction shoe has fallen out or become dislodged, install the shoe with the concave side facing up and position it so the pin hole is over the point of the adjuster screw. 5. Push the throttle control grip over the end of the right handlebar until it bottoms against the closed end. Rotate the grip until the ferrule notches are at the top. To prevent binding, pull the grip back about 0.12 inch (3.2 mm). 6. See Figure 3. Position the lower switch housing beneath the throttle control grip. Install two brass ferrules (Item 3, Figure 11) from this kit onto cables, seating the ferrules in their respective notches on the throttle control grip. The cables must be captured in the grooves molded into the grip. 7. Position the upper switch housing over the handlebar and lower switch housing. Route the wire harness conduit through the depression at the bottom of the handlebar. 8. Tighten the upper and lower switch housing screws finger- tight. 9. Position the brake lever/master cylinder assembly inboard of the switch housing assembly, engaging the tab on the lower switch housing in the groove at the top of the brake lever bracket. 10. Align the holes in the handlebar clamp with those in the master cylinder housing and tighten the lower screw and flat washer finger-tight. Position for rider comfort. Beginning with the top screw, tighten the screws to 60-80 in-lbs (6.8-9.0 Nm)

Kawasaki FI Calibration Tool Instruction Manual

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Filed Under (Kawasaki) by admin on 08-02-2011

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System Function Kawasaki FI Calibration Tool (FI Tool) is developed to modify the mapping of the racing machine to gain operating conditions suitable for the course and the rider’s skill. The following are the available setting functions. Table 1 FI Tool Function Model Name Functions Available Setting Range ’04 ZX-10R ’05 ZX-6RR ’05 ZX-10R ’06 ZX-10R ’07 ZX-6R 1) Adjust the injected fuel rate at acceleration -30 % ~ +30 % 〇 〇 〇 〇 〇 2) Adjust the injected fuel rate of No.1 and No.4 cylinder -30 % ~ +30 % 〇 〇 〇 〇 〇 3) Adjust the injected fuel rate of No.2 and No.3 cylinder -30 % ~ +30 % 〇 〇 〇 〇 〇 4) Adjust the injected fuel rate of primary and secondary injector * -30 % ~ +30 % -10 % ~ +10 % — – — 〇 — – — – — 〇 5) Adjust the ignition timing -15°CA~ +5°CA 〇 〇 〇 〇 〇 6) Adjust the sub-throttle opening angle -50 % ~ +50 % -45 % ~ +45 % 〇 — – 〇 〇 — 〇 — – 〇 7) Adjust the exhaust device opening angle -50 % ~ +50 % 〇 — 〇 〇 — 8) Adjust the all injected fuel rates of all cylinders and operating are a simultaneously -30 % ~ +30 % 〇 〇 〇 〇 〇 9) Adjust the value of engine over revolution limiter 0 ~ +300 rpm -1000 ~ +700rpm -1000 ~+1200rpm — – — 〇 — – — 〇 — – — 〇 〇 — – 10) Set the fuel cut or not at deceleration Use or Not Use 〇 〇 〇 〇 〇 11) Set the sub throttle controlled or not Controlled or Full Open Fixed 〇 — – — – 12) Set the exhaust device controlled or not Controlled or Full Open Fixed 〇 〇 〇 〇 〇 13) Set the Auto Shifter Ignition Cut Length Controlled or not, set Ig. Cut Time by gear range — – 〇 〇 〇 14) Set the Pit Road RPM Limit Controlled or not, set Upper Limit RPM by gear range

KTM 250/ 300/ 380 SX,MXC,EXC ENGINE REPAIR MANUAL

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

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Repair manual KTM 250 / 300 / 380 Art No 3206004 -E 2-2C main jet jet needle jet needle air control screw idle adjusting screw idle jet throttle valve Idling range A Operation with closed throttle valve. This range is influenced by the position of the air control screw 1 and the idle adjusting screw 2 . Only make adjustments when the engine is hot. To this end, slightly increase the idling speed of the engine by means of the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Create a round and stable engine speed using the air control screw (basic position of the air control screw = open by 1.5 turns). Then adjust to the normal idling speed by means of the idle adjusting screw. 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. Full throttle range D Operation with the throttle fully open (flat out). This range is influenced by the main jet and the jet needle. If the porcelain of the new spark plug is found to have a very bright or white coating or if the engine rings, after a short distance of riding flat out, a larger main jet is required. If the porcelain is dark brown or black with soot the main jet must be replaced by a smaller one. mixture too rich: too much fuel in proportion to air mixture too lean: not enough fuel in proportion to air 1 2 OPERATING RANGES OF THE CARBURETOR 2-3C Carburetor adjustment Basic information on 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 MOZ). Mixing ratio 2-stroke motor oil : super fuel 1:40 – 1:60. Basic information on a change of 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:

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