My check engine light will occasionally light if I quickly open up the throttle WIDE OPEN on the road, but it's only momentarily, and no code is displayed. The exact same thing happened a year ago and although no code was displayed the dealer said it was a throttle position sensor...which I replaced. Now the same symptoms seem to be occurring.....other than that the cycle runs perfectly.
SOURCE: hesitation problems 2003 yamaha wr 450 f
sounds like a jetting issue. change the main jets starting from the largest one you own and work your way down.
SOURCE: throtle open wide
It has been 35 years since I worked on a 360 as a mechanic at Lynn's Yamaha in D.M. Iowa. You have one of the few left alive. Pull the air cleaner off and look at the slide in the throat of the carb. Does it move all the way up and down freely when you twist the throttle? Is there play at the top of the adjuster on top of the carb? I think your bike has an oil pump for the 2 stroke oil. Remove the front right cover plate, (I think it had a right casing cover separate from the pump cover), and look at the operation of the cable wire on the pump. Both the slide and the oil pump cables should have some free play.
Are there reeds on your carb? The reeds will be between the carb and the cylinder if you have them. Are any of the reeds cracked or broken? Are all reeds fully closing? What condition is the rubber between carb and manifold? Get back to me with the information and we can go from there.
SOURCE: banshee running wide open after a couple of revs
The problem with vents is that a vent can get plugged and lessen or completely kill the flow of fuel. They will not make an engine rev wildly. Your banshee has standard carbs. The throttle cables may be routed incorrectly, pinching or stretching the cables. Remove the air filters. Look inside the carbs. Do the slides move freely up and down when the throttle is twisted? In the diagram below note the junction tube on the throttle cabel. The cable can stick at inside the tube. Is the connector hose between the carbs in place? Also, there is a switch on top of the carb. This can go haywire also. Odd that the problem was not present before they cleaned the carbs.
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SOURCE: yamaha xv 1100 virago
To me it sounds like the coil is breaking down and not working at higher RPM's. You can take them off and have them tested at a service shop.
SOURCE: 2000 Yamaha TW 200 lacks power, has a high speed
Your timing may have skipped a tooth. This causes the glowing pipe. Ther are 3 positions that look like tdc. The flywheel has "I" "T" and range marks. This can be confusing. Put the "T" on the mark and you will run perfect. If not you can set it up one tooth or down one from that position. One setting makes the bike run like ****, the other one is barely noticeable more or less power. You may have to play with it a bit to get it right. If your pipe still glows after redoing your timing then your can change up your jet to a higher flow. Usually a performance filter will lean out the mix causing a red pipe. To much fuel just fouls the plug. I deleted my filter box and put a cone K&N filter. I had to jet my carbs to compensate for all the extra air flow. The bike had more power after I did this. The main jet I used was 127 or some where around there, the stock jet is 115 I think.
To much gas would never make you glow. Timing being off or being to lean will.
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