Question about Motorcycles
Why does my Yamaha start but rev to maximum then wont stop when kill switch is engaged and key off only stops when I kill the fuel to it hard to start aswell it has new piston re board barrel new con rod new spark plug pre mix 40:1 ratio
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Posted on Jan 02, 2017
SOURCE: yamaha blaster runs but wont rev
ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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Posted on Jun 21, 2009
SOURCE: banshee wont rev
Usually related to TORS, specifically the safety switch in the clutch/park brake assembly. If it's defective the engine won't rev. Solution: look for a TORS removal kit.
Posted on Aug 21, 2009
Hi and welcome to FixYa,
Almost always, your described problem indicates clogged idling jets. Stale fuel causes varnish like coating which must be removed. This then calls for a carb pulldown, disassembly and soaking non-rubber parts in carb cleaner. In the exploded carb diagram below, the idle (pilot) jet would be # 20.
Good luck and thank you for asking FixYa.
Posted on Nov 17, 2009
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