bike keeps going for a second after you shut throttle

600mad · Jan 21, 2006

hi my fc600 keeps revving when you shut the throttle. only if it has been opened quite far, i was told it was probably drawing air, i took the inlet rubber off and it does not seem to be split, and when you close the throttle you can hear it snap close. the problem has got worse over the winter when the bike has not been used. any ideas? the bike also does return to normal idle, and i have sprayed wd40 round the inlet rubber with th engine running to see if there was any change in revs, no difference. when you first start the bike from cold and snap the throttle open it often cuts out.

LeFrog · Jan 21, 2006

Engine not running, when you open the throttle and release it, do you hear the slide go up and down?

Did you check the cable?

wildbill · Jan 21, 2006

600mad said:
hi my fc600 keeps revving when you shut the throttle. only if it has been opened quite far, i was told it was probably drawing air, i took the inlet rubber off and it does not seem to be split, and when you close the throttle you can hear it snap close. the problem has got worse over the winter when the bike has not been used. any ideas?

Sounds like either your cable is adjusted to tight or is routed wrong. Also check your throttle on the handlebars for smooth operation, could be dry or dirty in the housing. Check that as well, it also can cause what you described.
Hope this helps

kzoo · Jan 21, 2006

Does it eventually return to normal idle?

My YZ used have a hanging idle in cold weather. I opened the fuel screw to compensate, then upped the pilot jet a step or two to compensate for colder weather.

nsman · Jan 21, 2006

Most common causes, throttle cable not returning properly,worn carb slide.If the idle hangs up and is unsteady look at too tight valves,dirt in and/ or partial blockage of carb jets or body..

rancheroracer · Jan 21, 2006

All good advice, I'd look real close for an air leak though.

nsman · Jan 21, 2006

Most times we think of an air leak as a crack in the intake rubber but really an air leak can take many forms.Bent,burnt or tight valves also create air leaks,a worn carb slide is in reality simply an air leak.Even when your bike runs out of fuel and the RPM momentarily rises,that too is simply a radical change in the mixture ratio and in effect is an air leak.Anything that compromises the vacumn in the combustion chamber qualifies to be an ail leak.Isn' t mechanical stuff fun :roll:

LeFrog · Jan 21, 2006

If you had an airleak, the bike would likely get into wild overrev and stick there.

Time to clean up your carb and throttle cable, esp if the bike stayed in storage for a few months.

bike keeps going for a second after you shut throttle

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