setting idle screw 96 cr 250

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ACE -325X/ 395 X-XX CLOCK, UNIT, WHEEL, ODOMETER, TEMPERATURE & FUEL METER SETTING

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Filed Under (Honda) by admin on 24-12-2011

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Setup operations include 12/24hour clock, bar tachometer scale, shift warning RPM, numbers of engine rotation per signal, wheel circumference, units, odometer adjustment, units of temperature, temperature warning and fuel meter input resistance selection. These must be set up step by step. The computer will automatic reversion to main screen if no button operation for 75 seconds at any setting screen. 2. Press both MODE & RESET buttons to go into setting screen. In setting screens, press RESET button to add the flashing digit by 1 or convert units, press MODE button to confirm the digit setting and jump to next digit or next setting screen to be set. Press MODE button for 2 seconds at any setting screen to finish the setting and go to main screen. 3. It displays “12 or 24H and XX:XX-XX” symbols and AM/PM in case you select 12H. Operates buttons as descriptions of item 2 to finish clock and jump to 8,000/16,000rpm scale setting. 4. It displays 8,000rpm scale, presess RESET button to convert 8,000 or 16,000rpm. Press MODE button to confirm the setting and jump to shift RPM warning setting. 5. It displays ” RPM rXXX00 “. Follow the item 2 of button operation to finish the shift RPM warning setting and jump to engine specification setting. 6. It displays “SPC-X.X RPM”, the default value is 1.0; there are 4 options: 1.0, 2.0, 3.0 and 0.5. It means the numbers of engine rotation per signal. For example the value 2.0 means the engine rotate 2 turns to output a signal. 7. Press RESET button to move in loop sequence from one to another value of the 4 values. Press MODE button to confirm the setting and go to wheel circumference setting screen. 8. In “cXXXX” display, “c” means “Circumference”, following 4 default digits; flashing digit is digit to be set. Follow the item 2 of button operation to finish the wheel circumference setting and jump to unit setting. 9. It displays KM/h or MPH, each press of RESET button converts unit; press MODE button to confirm unit setting and jump to odometer setting. 10. It displays “ODO & 00000Xkm”, the “X” is tested odometer in factory, follow item 2 to setting a desired odometer and jump to thermometer unit setting. The setting screen will disappear when the odometer is over 30km or your setting is over 30km and returned to main screen. 11. It displaysm ” , or oFF”, each press of RESET button converts , or oFF; press MODE button to confirm temperature setting and jump to temperature warning setting. 12. It displays ” XXX” and the selected unit. Follow the item 2 of button operation to finish the temperature warning setting and go to fuel sensor input resistance setting. 13. It displays “100r and fuel tank symbol”, follow the item 2 to select 100, 250, 510 Ohm or oFF and return to the main screen. The fuel meter bar will disappear if you select oFF mode.

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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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How To Adjust the Accelerator Pump On the 40mm Mikuni Carburetor

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Filed Under (Yamaha) by admin on 21-01-2012

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1) The “blue” colored screw in the image is the duration adjustment screw. Underneath the head of the screw is a lock nut and the bracket arm that the screw is threaded into. To decrease the amount of fuel squirted the adjustment screw is turned “clockwise” or in. To increase the amount of fuel squirted the adjustment screw is turned “counter clockwise” or out. To get the max, amount of decrease remove the screw and take the lock nut off of the screw. Then replace the screw into the cam arm, then replace the lock nut underneath the arm on the screw. this gives you another 3/32″ of an inch in which the screw can be screwed in.
2) Turn the adjustment screw fully clockwise or IN. Start your engine, Blip your throttle open, if the engine stutters, (hesitates), it is not getting enough fuel so turn the screw counter clockwise to increase the amount of fuel squirted from the accelerator pump into the carburetor. Keep blipping the throttle and adjusting the screw till the carburetor starts to cough. Stop here and turn the screw back in till the coughing stops. Tighten down the lock nut. This should give you the best throttle response with the least amount of coughing and backfiring out the carburetor. Timing Adjustment Screw This is the “Green” colored screw just above the Blue duration adjustment screw. The” Mucker” said it best,,,,, This upper screw adjusts the “timing” of the squirt. By altering it’s setting, you can advance or delay the onset of the fuel squirt. But probably, it won’t have to be touched

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Kawasaki Ninja 250 FAQ

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Filed Under (Kawasaki) by admin on 15-11-2010

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Am I too small for this motorcycle? Duke – Sun May 14 17:38:31 2000 I’m only about 5’2″ and don’t have a problem, even though I can only touch the ground with the ends of my toes. Once you get a feel for the balance of the bike it’s not hard to keep everything upright. Only place I have trouble is pushing the bike backwards in a parking lot. Usually I just walk the bike (beside it) to where I can get on and get going. How does the EX500 compare to the EX250? Craig M. – Mon May 22 10:23:29 2000 I have both the EX250 and the EX500; both are Y2K models. The 250 is a screamer that performs well and can easily get me into trouble. My only complaints about the 250 are the excessive nose dive when getting on the front brake hard and the skittishness of the rear during high speed cornering. Both are easily corrected with suspension adjustments, I’ve just been too lazy to get the parts and do the work. A bit more wind protection would be great too. The 500 addresses these problems, the diving of the front end (to a degree); the rear’s skittishness and the wind protection. A plus for the 500 is the greater torque and power off the line; it pulls stronger (in my opinion) and will get you into illegal speed territory just a bit quicker than the 250. With greater weight, is has more stability in high speed and windy situations. Insurance is just about the same for both, with the 250 getting the nod for gas mileage. Service requirements are almost identical for both as well, being that they’re both parallel twins, the technology is the virtually the same. The downfalls of the 500: $2K more than the 250 (can do a lot to the 250 with that kind of money); buzzy mirrors, barely useful; heavier weight to have to push around the garage; lesser gas mileage (55-60 MPG; 250 pushes 70 MPG easily); engine is worse than a nervous dog shaking around at idle and at speed (here the 250 is far superior and much smoother). In my opinion, the 500 is a better suited for a larger rider, from a comfort standpoint. I feel I can stretch out a bit more on it than the 250 (I’m 5′ 9″, 160 lbs). The 250′s brakes are better tuned than the 500 and the shifter is much smoother. That may be due to the 3,500 mile difference between the two bikes. Bottom line, both bikes are great, the 250 is now my wife’s ride (mainly) and the 500′s mine (unless she steals the keys away). In time, I’ll make the adjustments to the 250; she doesn’t push it like I do.

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2008 KTM 250 SX-F 250 XC-F, XCF-W 250 EXC-F, EXC-F SIX DAYS INSTALLATION MANUAL

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Filed Under (KTM) by admin on 22-10-2010

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Hand brake lever The hand brake lever [1] is mounted on the handlebars on the right and actuates the front wheel brake. The adjusting screw [A] can be used to change the basic position of the hand brake lever (see “Maintenance”). 1 A Short circuit button The short circuit button [2] turns off the engine. When pressing this button, the ignition circuit is short-circuited. 2 Headlamp switch (XCF-W) In this model the headlamp is switched on with the pull switch [5] . 5 Flasher switch The flasher switch is a separate unit and is mounted on the left portion of the handlebar. The wire harness is designed in a way that whenever you want to use your bike off-road, you can dismount the entire turn indicator system without affecting the function of the remaining electrical system. Flasher left Flasher right
OPERATION INSTRUMENTS » ENGLISH 7 1 2 3 4 5 Starter button Pushing the red starter button [1] will actuate the E-starter. Emergency OFF switch (EXC-F Australia) The red emergency-OFF switch [2] is arranged adjacent to the throttle grip. In this position, the E-starter is operational and the engine can be started. In this position, the E-starter and ignition circuits are interrupted.The E-starter cannot be actuated, and the engine will not start, not even if you attempt to start it with the kickstarter. Pushing the black starter button [3] will actuate the E-starter. Indicator lamps The green control lamp [4] flashes in the same rhythm as the flashing indicator when the indicator is working. The blue control lamp [5] lights up when the high beam is on. TEST All of the display segments briefly light up for the display function test. Electronic speedometer The display in the electronic speedometer is activated as soon as you press a button on the speedometer or an impulse is received from the wheel sensor. The display lights up when the engine is running. The display is cleared if no button is pressed for 1 minute or no impulse is received from the wheel sensor. The button is used to change between display modes. The + and – buttons are used to control various functions

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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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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)

HARLEY DAVIDSON FLSTN SADDLEBAG GUARD KIT REMOVAL AND INSTALLATION MANUAL

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

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REMOVAL All Models 1. If equipped with saddlebags, removal may ease installation. Follow the instructions in the appropriate Service Manual or Instruction Sheet. 2. See Figure 1. Remove and discard the forwardmost fender support bolt (1). Repeat for the other side. 3. See Figure 2. On the left side, remove the footrest support mounting bolt (1) and footrest support bracket assembly (2). Discard the mounting bolt. 2005 – 2006 Models 1. Loosen the exhaust shields as necessary following the instructions in the appropriate Service Manual. Move as necessary for access. 2. Loosen the exhaust header nuts following the instructions in the appropriate Service Manual. 3. See Figure 3. Remove bolt (1) connecting the exhaust system (2) to the support bracket (3). 4. See Figure 4. Remove the two rear muffler bracket bolts (1). 5. See Figure 5. Move mufflers enough to access the rear bolt attaching the exhaust mounting bracket to the frame. Remove bolt (1) and discard. 2007 – Later Models NOTE On 2007 – later models, the frame tab (4) has a plug instead of a bolt (see Figure 6, item 1). 1. Remove plug and discard. 1 is05313 1. Fender support bolt (discard) Figure 1. Remove Docking Hardware 1 2 is05320 1. Footrest support mounting bolt 2. Footrest support bracket assembly Figure 2. Footrest Support Bracket Assembl NSTALLATION Right Side See Figure 5 or Figure 6. 1. See Figure 7. Install upper screw (7) in the fender support. Tighten screw finger-tight. 2. Install the lower screw (4 or 5) with the saddlebag guard, washer (9) and locknut (6) inside the frame. Tighten screw finger-tight. 3. Tighten the upper screw to 30 ft-lbs (41 Nm) . 4. Tighten the lower screw to 40 ft-lbs (54 Nm) . Tighten nut to 30 ft-lbs (41 Nm) . 5. 2005 – 2006 Models: a. Loosely install the exhaust header bolts. b. See Figure 4. Loosely install two rear muffler bracket bolts (1). c. See Figure 3. Loosely install bolt securing exhaust system (2) to support bracket (3). d. Tighten exhaust header bolts following the instructions in the appropriate Service Manual. e. Tighten support bracket bolt and rear muffler bracket bolts following the instructions in the appropriate Service Manual. f. Tighten exhaust shields following the instructions in the appropriate Service Manual. 6. Install saddlebag (if removed) following the instructions in the appropriate Service Manual or Instruction Sheet. 1 2 3 4 is05333 1. Lower saddlebag guard screw 2. Upper saddlebag guard screw 3. Saddlebag guard 4. Exhaust support bracket Figure 5. Install Saddlebag Guard – Right Side Shown (2005 Models) -J04645 2 of 4
2 1 3 4 is05332 1. Lower saddlebag guard screw 2. Upper saddlebag guard screw 3. Saddlebag guard 4. Frame tab Figure 6. Install Saddlebag Guard – Right Side Shown (2007-Later Models) Left Side 1. Loosely install upper screw (7) through the saddlebag guard and the fender support. NOTE Spacer (8) must be installed with the chamfer facing out. 2. See Figure 7. For 2005-2006 Models: Install lower screw (3) through the saddlebag guard, saddlebag guard spacer (8), footpeg support and the frame. Tighten to 30 ft-lbs (41 Nm) . For 2007 and later Models: Install lower screw (10) through the saddlebag guard, footpeg support and the frame. Tighten to 30 ft-lbs (41 Nm) . 3. Tighten upper screw to 30 ft-lbs (41 Nm)

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BMW R1200RT Sport/ Touring 1100X Kit Installation Manual

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Filed Under (BMW) by admin on 17-12-2010

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Step 1 — Locate ‘mold circle’ indentation on each side fairing panel (Pic 1). With panel mounted on bike, this indentation is center, at rear inside panel edge, and faces inside. Temporarily install bracket as shown in (Pic 2), align bottom bracket hole over indentation and mark for hole. Remove brackets at this time. Step 2 — Remove fairing body side panels. Four screws per side required for removal, see owners manual. Drill a 3/8″ hole at mark. If harness kit has not been installed, do not re-install left side panel until finished unless you remove tank to install harness. Removal of the tank is the best option to route harness from battery area to front of the bike. Step 3 — As required, re-install fairing body side panels. Do not re-install the top factory inner panel Torx Screw yet, as you will re-use this screw to secure the top light bracket mounting hole to the fairing panel. Step 4 — Using 10/32×1/2 screws and black shoulder washers from Hardware package, secure lights to PIAA Ezy-Mount® brackets (See Pics 3 & 4). Right side bracket is stamped ‘EZY-MOUNT’. See note below for Powersports lights. Due to close proximity of the light body to fairing side panel, access to the vertical adjustment screw on the panel side of the light will not be possible after installation. To prepare for this; before installing bracket/light assembly to panel, make sure this screw is tightened so that you can barely move the light body. After bracket is installed, final vertical adjustment can be secured with the inside screw. Torque on this screw is adequate to hold vertical adjustment, and the screw that faces the panel will not come loose. NOTE: WHEN INSTALLING POWERSPORTS LIGHTS, YOU MUST INSERT THE SHOULDER ADAPTER WASHER INTO THE LIGHT FOOT, BEFORE INSERTING SCREW TO SECURE LIGHT FOOT TO BRACKET. THIS ADAPTER CENTERS LIGHT FOOT OVER PEMNUT (TIGHTEN THIS SCREW SECURELY). Step 5 — Insert well nut into previously drilled 3/8″ hole. Place bracket assembly against fairing, aligning top hole with the top fairing mounting position; re-install the factory Torx screw at this location. Adjust as necessary and install the second supplied SS 10/32 x 5/8 Torx screw thru the lower bracket mounting hole to the well nut. With constant pressure on the screw, tighten securely. Constant pressure ensures that the rear expandable section of the well nut captures the back of the plastic inner panel as you tighten the screw. Future removal of fairing panels is now possible with light assembly installed (utilizing the bottom bracket mounting screw), thus re-alignment of lights is not required after normal maintenance.

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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