idle problems

[benyamaha]

Hi guys, just gave my yamaha yz80 carb a clean and when I fitted it back I couldnt get the bike to idle without choke and when I switched the choke off it revs flat out!Ive messed with the idle screw but that does nothing!! Ive checked all my hose clamps are tight and seated properly but it makes no difference help will be appriated

[CestrianX]

Why did you clean the carbs? Was it idling OK before the clean? Is the air filter clean? Is there a fuel filter and is it clogged?

More info required.

[benyamaha]

I was putting a new piston i just did it as it was a straight foward job to do... it revs its head off and it runs fine with choke on. Maybe the rubber pipe from the carb to the engine is split or perished causing a vacume leak?

[misscrabstick]

have you put the throttle slide/needle assy in 180 degrees out?

[The other Paul Rudd]

[CestrianX]

"it revs its head off and it runs fine with choke on" - OP

So you know exactly whats causing the problem then. Assuming you're working fervently to fix your transport, have you found the fault yet?

[benyamaha]

Thanks for the replys! I did change the base gasket and they looked pretty clean and btw the problem happened after hours of riding it then when I came to it the next day to start the problem occured! And the throttle slide slides all the way down and up perfect