how to adjust idle speed 2011 yamaha 1100

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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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Harley Davidson 6- SPEED CONVERSION KIT FOR BIG TWIN 5- SPEED TRANSMISSIONS INSTALLATION

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Filed Under (Harley Davidson) by admin on 05-03-2012

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5/16 Bolt hole boss clearance This can easily be checked with the trap door gasket. Put the gasket on the dowel pins. AII material of the boss around the hole that “sticks outside” the gasket (60 degrees forward to 60 degree backwards) must be removed (see figure A). Primary fork clearance Place the gasket on the housing and remove material as indicated for clearing the shifter fork (see figure B). WWW . ZODIAC . NL PERFORMANCE PRODUCTS FOR HARLEY-DAVIDSON ® INSTALLATION INSTRUCTIONS FOR 6 SPEED CONVERSION KIT AND 6 SPEED BUILDER KIT speed transmission. Also make sure you have a 1990 or later Factory Service Manual available. Tools The conversion kit should only be used in new or low milage transmissions. If gears or bearings of a used Gear set Removal Refer to the Factory Service Manual Section for Mainshaft and Countershaft removal. When you get to the point of actually sliding the gear set out make sure you properly mark the 5th gear set as described in the Factory Service Manual (for used transmissions only). Further follow the factory removal procedure. Clearance Checks The 6 Speed conversion and builder kit will fit in most OEM or aftermarket transmission housings without may be needed. The following clearances must be checked before assembling the 6 speed transmission. 28-05-2008 We recommend the kits are installed by a qualified mechanic with knowledge of the Harley-Davidson 5 needed are the same as used for a 5 Speed transmission. 5 speed transmission are worn, new ones must be installed, or better, the builder kit should be used. any modification of the housing. However due to casting differences, in some instances some modification
WWW . ZODIAC . NL PERFORMANCE PRODUCTS FOR HARLEY-DAVIDSON ® Pillow block clearance (right side) Make sure there is clearance between the pillow block and the housing. Any clearance is O.K. (see figure C). Fork shaft support clearance Again use the gasket as the template and remove the material as indicated (see figure D). Shift drum end play The end play of the shift drum must be checked prior to final installation. Install the shift drum. Measure the end play with feeler gauges at the right pillow block (see figure E). End play should be between .004″ and .010″, some 1/2″ X 7/8″ 0.008″ thick shims are included to adjust the end play

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KTM 125 EXC, EXC SIXDAYS 200 XC, XC-W, EXC 250 XC, XC-W, EXC, EXCSIXDAYS 300 XC, XC-W, EXC-E, EXC-ESIXDAYS OWNER'S MANUAL 2008

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Filed Under (KTM) by admin on 02-12-2010

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Chassis number The chassis number is stamped on the right side of the steering head tube. Enter this number in the field on page no 1. Engine number, engine type The engine number and the engine type are stamped into the left side of the engine below the engine sprocket. Enter this number on page 1. Clutch lever The clutch lever [1] is located on the left side of the handlebars. The adjusting screw [A] is used to change the original position of the clutch lever (see maintenance work on chassis and engine). The clutch is hydraulically actuated and adjusts itself automatically. Hand brake lever The hand brake lever [2] is mounted on the handlebars on the right and actuates the front wheel brake. The adjusting screw [B] can be used to change the basic position of the hand brake lever (see maintenance work on chassis and engine). OPERATION INSTRUMENTS » 1 2 A B
ENGLISH 6 OPERATION INSTRUMENTS » TEST All of the display segments briefly light up for the display function test. WS (wheel size) The display changes and the circumference of the front wheel is briefly displayed in millimeters (2205 mm corresponds to a front wheel circumference of 21″ with production tires). Afterwards the display will return to the previous display mode. 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. SPEED display mode / H (service hours) Only the SPEED / H and SPEED / ODO display modes are activated in the condition at delivery. SPEED/H is displayed whenever the display is activated and the front wheel is not turning. It automatically changes to the SPEED/ODO display mode as soon as the front wheel starts turning. SPEED displays the speed. H displays the engine’s service hours. The service hour counter starts to count as soon as you start the engine. The displayed figure cannot be changed. Service intervals are indicated in service hours for some KTM offroad motorcycles, making the service hour counter a very practical function. SPEED / ODO display mode (odometer) The SPEED/ODO mode displays the speed and the total distance traveled. The display automatically changes to the SPEED/H display mode when the front wheel stops turning. + button no function – button no function briefly press buttonchanges to the next display mode hold button 3 secs. changes to the next display mode The electronic speedometer has a number of display modes (functions) that you can also activate (reveal) (see: Activating and deactivating display modes).
ENGLISH 7 OPERATION INSTRUMENTS » SPEED / LAP (lap time) display mode You can use the manual stop watch to stop and store up to 10 lap times, which you can view in the LAP/LAP display mode (see below). LAP displays the lap times in hours, minutes and seconds. + button Starts and stops the stop watch, lap time is not reset to 0 – button Stops the stop watch, stores the lap time and restarts the stop watch again. The time is reset to 0. A total of 10 lap times can be stored. If the lap time continues to run after you press the – button, all 10 memory locations are occupied.To clear all of the stored lap times, hold the button for 3 seconds in the SPEED/LAP mode.Up to 10 lap times can be stored in this way. briefly press buttonChanges to the next display mode.If no lap time is stored or the motorcycle is driving, the LAP/LAP mode will be skipped. hold button 3 secs. Clears all LAP figures SPEED / CLK (time) display mode CLK displays the time in hours, minutes and seconds. + button no function – button no function briefly press buttonchanges to the next display mode hold button 3 secs. set the clock menu To set the clock, see „Setting the clock”. Activating and deactivating display modes In the display mode SPEED/H, press and hold the button for 3 seconds to access the SETUP menu. The active functions will be displayed. The blinking function can be activated by pressing the + button and deactivated by pressing the – button. Press and hold the button 3 seconds to store the settings. If no button is pressed for 20 seconds, the setting will be stored automatically and the display will return to the SPEED/H mode. + button activates the blinking display – button deactivates the blinking display briefly press buttonchanges to the next display without changing any settings hold button 3 secs. starts the SETUP stores the settings and changes to the SPEED/H mode

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2001-2002 GL1800 A ABS Speed Sensor Wire Clamp Location INSPECTION/ REPAIR PROCEDURES

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Filed Under (Honda) by admin on 29-01-2011

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1. If the VIN is within the preceeding range, inspect the front ABS speed sensor wire clamp according to the following illustrations. 2001-2002 GL1800A ABS Speed Sensor Wire Clamp Location INCORRECT Installation CORRECT Installation Service Bulletin American Honda Motor Co., Inc. 2001-2002 GL1800 ABS Speed Sensor Wire Clamp Location 0112 GL1800 #9*GL1800 #9*0112*2001-2002 GL1800 ABS Speed Sensor Wire Clamp Location*GL1800, ABS Speed Sensor Wire Clamp Location*Motorcycle*1800 2 of 2 ©2001 American Honda Motor Co., Inc. – All Rights Reserved GL1800 #9 DECEMBER 2001 IDENTIFICATION There is no identification mark associated with this Service Bulletin. PARTS INFORMATION There is no parts information associated with this Service Bulletin. WARRANTY INFORMATION The normal warranty claim submission requirements apply. Submit one warranty claim per VIN with the following information only: Inspected and REPAIRED Template: GL#9 Hours: 0.2 hours Parts: None If the clamp is installed correctly on top of the speed sensor, no further action is necessary. 3. If the clamp is installed incorrectly under the speed sensor, remove and reinstall the clamp and speed sensor correctly. Torque the bolts,. Torque: 12 N • m (1.2 kgf • m, 9 lbf • ft) If the speed sensor wire clamp for the front ABS speed sensor is installed incorrectly, the ABS speed sensor air gap may be out of specification. This does not affect ABS speed sensor operation, but the clamp should be installed correctly. Inspect and repair all affected units using the Inspection/Repair procedures listed below. Inspect all unsold units and customer units brought in for service. AFFECTED UNITS 2001-2002 GL1800A units as follows: MODEL 2001 GL1800A All units 2002 GL1800A 1HFSC474*2A100001 – 1HFSC474*2A101643 * = denotes check digit Any unit in the above VIN range may be affected and should be inspected according to the procedures in this Service Bulletin. All units outside of the above VIN range do not require inspection. CUSTOMER NOTIFICATION There is no customer notification associated with this Service Bulletin.

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V-Star 1100 And Dragstar 1100 Modification V-Star Driving/ Passing Lights Factory Chrome Light Bar Cover Installation

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Filed Under (Yamaha) by admin on 08-11-2010

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Modify your factory light bar cover to fit on Yamaha brand driving/passing lights. Use a rotary tool to widen the fastening area of the lower backside clips on the cover. The total width between the clips should be 4 æ inches. Trim off º inch on both inside ends of the lower backside attachment clips. Trim the clips equally. The following picture shows a modified cover. Narrow the clips on both ends to fit over the welds on the bar. The cover will not attach to the bar if the width between the clips is too narrow. If the width is too wide the cover may slide sideways on the bar. Narrow both clips equally to center the cover over the welds on the lower edge of the bar. The top of the cover is modified to allow the cover to fit over the bolts on the light bar. The top edge of the cover is filed æ inch deep and 5/8 inch wide to fit over the bolts. The back top edge is filed or ground 1/8 inch to fit over the light bar fastening bracket. Use care when filing chrome covered plastic. The following picture will help to complete this step in the modification. Modify your factory light bar cover to fit on Yamaha brand driving/passing lights. The ends of the cover are modified to allow the cover to fit over the upward curved light bar. The upper openings on the ends of the cover that fit over the bar must be filed to enlarge the area. Grinding the cover ends will allow the cover to fit and clip onto the bar. The end openings are filed or ground at an angle to match the slope of the bar. This picture shows the outer end of the cover. The ends of this cover have been modified by enlarging the area on the upper edges to fit over the upward curving light bar. The ends must be enlarged 1/8 inch on the top edge. The cover edge can be slanted upward to match the curved bar. Modify the cover ends until it fits without the outer chrome cover touching the bar. Modify your factory light bar cover to fit on Yamaha brand driving/passing lights. Sometimes the modified light bar cover may touch the bottom of the headlight. Modify the cover, or adjust the bar or headlight if you notice the headlight touching the bar cover. This modification makes the V-Star motorcycle with Yamaha driving lights look better. The light bar bolts are covered and the chrome cover improves the appearance of the front of your bike. Other V-Star riders will notice how nice the front of your bike looks with the chrome light bar cover installed

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2008 KTM Model Engine Oil Recommendation Chart

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Filed Under (KTM) by admin on 24-11-2010

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2008 Model Type Recommended Engine Oil Type Quantity SPORTMINICYCLES AC 50 SX MINI Motorex ATF Super (Dexron II Gear Oil) 0.15-0.2 L SPORTMINICYCLES LC 50 SX JUNIOR Motorex ATF Super (Dexron II Gear Oil) 0.15-0.2 L 50 SX Motorex ATF Super (Dexron II Gear Oil) 0.15-0.2 L 65 SX Motorex Top Speed 4T 15W50 0.5L SX 2 STROKE 85 SX Motorex Top Speed 4T 15W50 0.5 L 105 SX Motorex Top Speed 4T 15W50 0.5 L 125 SX Motorex Top Speed 4T 15W50 0.7 L 144 SX Motorex Top Speed 4T 15W50 0.7 L 250 SX Motorex Top Speed 4T 15W50 0.7 L SX 4 STROKE 250 SX-F Motorex Power Synt 4T 10W50 1.1 L 450 SX-F Motorex Power Synt 4T 10W50 1.35 L 505 SX-F Motorex Power Synt 4T 10W50 1.35 L CROSS COUNTRY 2 STROKE 65 XC Motorex Top Speed 4T 15W50 0.5L 85 XC Motorex Top Speed 4T 15W50 0.5L 105 XC Motorex Top Speed 4T 15W50 0.5 L 200 XC Motorex Top Speed 4T 15W50 0.7 L
200 XC-W Motorex Top Speed 4T 15W50 0.7 L 250 XC Motorex Top Speed 4T 15W50 0.7 L 250 XC-W (e) Motorex Top Speed 4T 15W50 0.7 L 300 XC Motorex Top Speed 4T 15W50 0.7 L 300 XC-W (e) Motorex Top Speed 4T 15W50 0.7 L CROSS COUNTRY 4 STROKE 250 XC-F Motorex Power Synt 4T 10W50 1.1 L 250 XC-F-W Motorex Power Synt 4T 10W50 1.1 L 450 XC-F Motorex Power Synt 4T 10W50 1.35 L 450 XC-W (R) Engine – Motorex Power Synt 4T 10W50 Gearbox – Motorex 4T 10W50 0.7 L 0.9 L 505 XC-F Motorex Power Synt 4T 10W50 1.35 L 530 XC-W (R) Engine – Motorex Power Synt 4T 10W50 Gearbox – Motorex 4T 10W50 0.7 L 0.9 L ENDURO RACING 450 EXC (R) Engine – Motorex Power Synt 4T 10W50 Gearbox – Motorex 4T 10W50 0.7 L 0.9 L 530 EXC (R) Engine – Motorex Power Synt 4T 10W50 Gearbox – Motorex 4T 10W50 0.7 L 0.9 L SUPERMOTO LC4 690 Supermoto Motorex Power Synt 4T 10W60 Approx. 2.0 L SPORT ATV 450 XC Motorex Power Synt 4T 10W50 2.0 L 525 XC Motorex Power Synt 4T 10W50 2.0 L LC8 950 Super Enduro (R) Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L 990 Adventure Orange Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L 990 Adventure Black Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L 990 Adventure S Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L 990 Super Duke Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L 990 Super Duke R Motorex Power Synt 4T SAE 10W50 (for temperatures over 32° F) and 5W40 (for temperatures under 32° F) Approx. 3.0 L

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Honda Shadow A.C.E. v. Yamaha V-Star 1100 Middleweight Import Cruiser Shootout

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Filed Under (Tips and Review) by admin on 25-11-2010

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You want a big cruiser but you don’t need a large 1500 cc behemoth that weighs close to half-a-ton fully loaded. You want something you can cruise down the boulevard on but you want to be able to handle a corner or two. You want classic styling but you insist on reliability as well. If these are your guidelines, then Honda and Yamaha might have what you’re looking for in the guise of the Honda Shadow American Classic Edition and Yamaha V-Star 1100. Shadow ACE 1100 The ACE and V-Star have a few things in common: Both sport requisite V-twin powerplants (75° for the V-Star and 45° for the ACE) and both possess typical Japanese refinement. Aside from these similarities, the two rides are very different machines. While both machines are shaft driven, the ACE uses the shaft housing as the swingarm. Although this arrangement is effective, it’s a bit lacking style-wise. However, the whitewall tires and the classic fenders and tank help to create a traditional design that turns heads when you’re out and about. The V-Star uses a different approach, utilizing a pivoting sub-frame design with a hidden mono-shock that keeps the lines fluid and consistent with the rest of the bike. Although this beast isn’t equipped with whitewall tires, it still cuts a graceful, glittering profile. The only flaw we noticed was the small headlight that

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YAMAHA V-Star 1100 Motorcycle Enhancements Remote Oil Filter Installation Manual

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Filed Under (Yamaha) by admin on 10-11-2010

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Removing Your Old Filter and Beauty Cover In order to install the new Remote Oil Filter Kit, you’ll need to remove the stock Yamaha “beauty cover” and the old filter and filter cover. Remove the engine parts necessary to access the stock filter as outlined in the V-Star owner’s manual. The parts should come off in this order: 1. Muffler assembly 2. Front exhaust pipe 3. Rear brake reservoir cover bolt and brake cover (the reservoir should not be removed, it can remain in place and be moved aside as needed) 4. Right floorboard (this can be simply loosened, by loosening the two bolts underneath) With the above parts removed, you can remove the Allen bolts holding the beauty cover and filter cap from your engine. There are five Allen bolts holding the beauty cover (so named, because most of the cover just covers the chromed side of the engine There are five bolts holding the cover. Ignore the three on the “Yamaha” cap in the middle – these just hold the Yamaha cap to the beauty cover itself. One bolt is hidd – in this picture – just be the Yamaha ca en low p. The bottommost bolt on the beauty cover will likely leak some oil when you remove it – it holds on the inner oil filter cover. Once you remove the beauty cover, you can remove the oil filter cover, and the oil filter Keep these two “O” rings, you’ll need them for the remote kit Old oil filter. Toss it away; you’ll never need one again! Throw away the old filter, and carefully remove the orange and black “O” rings from the filter cover (see picture above). These two “O” rings will go on the new engine cap in the same order as on the old filter cover. “O” ring for bottom bolt. When the beauty cover and filter cover are removed, be sure not to lose the tiny “O” ring that the bottom bolt goes through. Preparing the Remote Oil Filter Kit Remove the orange and black “O” rings from the stock filter cover plate, and place them on the Remote Oil Filter Kit engine cap – black on the inside, orange on the outside – just like on the stock filter cover.

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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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