Turn the airscrew slowly in, and then out, until you find the point where the idle is … The only way I was able to set the idle was by opening the throttle part way and tightening the cable adjustment. Screw in the mixture screw all the way on both carburetors. As already stated, start with the pilot circuit. If you don’t have a tachometer, try to set the speed so the saw idles as high as possible without engaging the clutch. Then you find the sweet spot or best idle by using the idle adjust screw, next double check the first step again. Slowly turn in the screw … To set the brass idle mixture screw, turn it in all the way in slowly BUT not tight, just until it touches the bottom, then turn it out 2 1/2 turns. Turn the idle screw counter clockwise until the slide is just closed. Now turn the idle screw in 1 1/2 turns. This may not be a idle problem, so make sure you have your choke down so your engine can get air. The only way I could get it to idle, was with both mixture screws fully closed (seated). Screw the screw all the way in then turn it out 3 1/2 turns.. Use this video to help identify what type of mixture screw you have. I have a 2000 CR125. Now open the screws on both carburetors 1-1/4 turns. If it is closed off the engine will idle funny and then cut out. If the saw will not idle, go to the next step. if so how do I correct, btw this is for a 75 750f. • (6) Set the low speed fuel adjustment. Turn the airscrew all the way in, then turn it out 1.5 turns to start. Last is adjust the sync just off idle say 1300-1400 rpm using the cable adjust ferrules. Items you will need. The idle screw on it makes no difference in the idle whether turned all the way in, or all the way out. Start the engine, and turn the idle screw in until you get a slightly fast idle, or hold the throttle just barely cracked, to keep the engine idleing. The revs still work ok with the carby lever on the handle. After all of this and you are sure the valves are adjusted right you can sync the carbs. I turned my idle screws, the ones next to the air box all the way in, and the bike seems to idle fine. Follow the tips in this video to be on your way to being a jetting pro! Now this video shows a generalized procedure for adjusting the idle speed air/fuel mixture. You can fine-tune the idle mixture screws in a few minutes and keep the motor running strong. Make adjustments 1/2 a turn in either direction to find the smoothest idle speed. Remove the spark plug cap off one cylinder. Never set the idle so the chain runs when the throttle is released. too lean? I pulled them out about 4 turns, then the bike starts to die. Start the engine, and turn the idle screw in until you get a slightly fast idle, or hold the throttle just barely cracked, to keep the engine idleing. Now the idle speed screw adjusts engine idle fine with no black smoke, but still a tad rich. They are synced at idle using the throttle stop first. Set the screw in the position where the engine’s idle sounds most even and smooth to … Warm up the engine to normal operating temperature and shut the engine down. Turn the air screw all the way in, then turn it out 1.5 turns to start. But I just can't seem to get the revs low enough when in the idle/start position. I read somewhere that these need to be about 1 and a half turns out. What is this an indication of my mixture? Do not tighten the screw as the seat for the screw can be easily damaged. Screwdriver. All carburetors are basically the same but with some subtle design differences. 65 jets, 2.5 power valve, 16 psi vacuum at idle out of gear. To set your idle speed screw, look into the engine side of the of the carburetor's bore. Turn the screw counterclockwise and clockwise 1/2 a turn from the middle position and listen to the sound of the idle. 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