Comment by kitten_art, posted on Nov 17, 2008Thankyou Bike still running rough even though we have cleaned carb, changed air filter, checked plug, lead, fuel line. Wont tick over nicely. Throttle cable seems to be sticking, oiled it, but still not returning to tick over when revved. Oiled the carb throttle slide. Sounds very tappity, but local bike shop said that was nothing to worry about. Helllllp!
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you say there is a noise on the valve , do you mean the inlet and exhaust valves ? if they are making a jingelly tappy noise then they do need adjusting ! does 1st to third gears rev to near enough max revs in each one or do the faulter and miss ? if miss then have the carb and fuel tank cleaned as well as the adjustment of valves ! exhaust could be choked up also if you only do town runs also , may need decoke of exhaust port and exhaust system !
Full disassemble of carbs is needed. Thorough cleaning on jets and airways, vacuum and pilot screw adjustment must be done too. Check the spark plugs for lean mixture indication and replace them if necessary.
If I understand you this bike has not run in a long time? If so the carburetor would be gummed up with dried up fuel. Clean the carb and internal jets thoroughly, check the fuel tap and lines and use fresh fuel. It will not run well if the carb is dirty from old fuel. Once clean the carb will respond to screw settings. Turn for the smoothest idle. Timing may not be an issue if it has electronic ignition. It is not adjustable on Yamahas.
Hello shawn...Yes indeed gasoline can degrade over time. That can lead to a number of problems, ranging from hard starting, to rough running, to no starting at all...If your bike was stored for 2 years the gasoline in it has degraded beyond use. Even if the gas was treated with stabiliser before it was stored...it will still degrade in 10-12 months, if not sooner. I'm suprised your bike will even start. I suggest you drain ALL the gas out of the tank, Rinse and refill with fresh gas, drain your carbs as well...the stale gas has most likely clogged the pilot jets, draining the carb bowls will help. Go to your parts store and buy a can of "Seafoam" pour 1/2 of it in with your fresh gas..use the other 1/2 on your next tank of gas. Replace fuel filter after 1st tank, the seafoam will dislodge any debris that was in the fuel tank. It will also clean the combustion chambers and carb jets. Check your carb boots for any cracks or detoration that would cause a vacuum leak. Replace your spark plugs. If your bike is still running rough after this, then the carbs will need to be removed and cleaned and/or rejetted. Good luck..i hope this helps, please rate me a fixya.