New Top End - High RPM Idel

[escarter1979]

I just put a new top end in my 02 CR250. Everything went smoothly, but now when I start the bike, the engine rev's pretty high (as if the throttle is a little more then cracked). I also had a few dents removed on the expansion chamber and re-packed the silencer, but did not make any major changes that would warrent changing the jetting (at least I don't think). I adjusted the idle control with no luck as well.

Any pieces of advice?

[Venom 1000TT]

Air leak could do that

Check for leaks around the boots.

[escarter1979]

Everything is tight. How else do I check for an air leak?

[anthony250]

go top of page of honda 2 strokes is says pressure testing a 2 stroke

[moto9]

By chance is the slide or cable hanging up...what about the idle adjustment.

Check the carb if you know it's not an airleak.

[escarter1979]

found the problem. When I was disassmbling, a head stud broke off. I took the cyl in to a local shop and had them extract the broken bolt. It appears that they just drilled it out and re-tapped the hole to the same size. When I torqued the cyl head, everything seemed fine, but apparently when torquing or running, the threads failed. Going back to the local shop for an explanation.

I could have half-assed it myself.

Any thougts short of having a custom stud fabricated?