[Leeballs]

Cleaned carb on 1986 TRX250 Fourtrax. Fired it up and idled well for a while. After a couple minutes it started revving itself and when I gave it throttle it would stay at the revs then climb. The throttle is not sticking, I have checked the slide and had a quick look for vacumn leaks. Bike stops revving if you put it in gear. I do not know very much about carbs so forgive me if it's something obvious.
Cheers

 

[b52bombardier1]

Sounds like a vacuum leak in the manifold between the carb and head.

Rick

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[shadetree]

my money says not enough fuel reaching the carb's float bowl ?, as in, no fuel getting from tank to carb ?, or float needle stuck closed ?.