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: bike stutters when started
check your fuel filter for or fuel lines for kinks,you may also check the grade of fuel
SOURCE: Will not go above 6000 RPM's
clean the air filter really good along with the air box and clean the carb. clean the pilot and needle jets and check the float. i got to run so this gona be cut short but just check that **** out thats probly it
SOURCE: Yamaha TTR 250, Idling Problem
check the inlet manifold rubber has not seperated from the aluminium part of the manifold ,this is very common on the ttr 250 and will cause the exact problem you have,if it is seperated either replace it or repair it with some good quality rtv sealant avoid sillicone sealant as it is not petrol resistant and will turn to jelly.adam
SOURCE: bike idles, but with a little throttle it jumps to high rev and wont come back down to idle
You need to oil your cables first....They make a gadget to help you do this...it clamps around the end of the cable, and you spray oil into a provided hole for a spray nozzle tube...Then see if the cables are unstuck by turning the throttle grip back and forth for awhile....start it and see if that helped....if not you may need to replace the cable(s)...I doubt that the slide in the carb is hanging up...or valve.If this doesn't work notify me.
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