Fresh rebuild, engine revving when not on the gas?

[mitchconley]

Just rebuilt my 05 to a 416 and was on my first ride today. I warned te bike, took it for a lap around the neighborhood, then let it cool. Awhile later I did it again and let it cool. Then I took it out in the trails and was riding for a half hour or so being easy on it but varying rpms. I then sat for about 20 mins and the wheeler had ran fine until then. After I started doing half throttle 1st-5th-1st runs and after a few I noticed the rpms weren't dropping when I let off the throttle and if I put the bike in neutral it would rev up a bit for a few seconds then slowly drop back down to idle. Not sure what's causing this or how to fix it. I'm no pro-mechanic so give me the dumbed down version please.

[punk rock kiel]

vaccum leak

[on the rocks]

yep, sounds like its sucking in air some where it shouldn't be.

[jman7290]

Did you rejet it, sounds like it could be running real lean. Motors tend to rev up when they are lean.

[01boneless]

if it ran good for a while then started doing it... u have a air leak make sure the carb boots are all tight. if its done it since you rebuilt it then the piliot jet could be to lean causeing a hanging rev

[JOHNDOE83]

if you didnt re-jet it then thats your problem.

[jman7290]

If you didn't rejet, you will have to rebuild if you keep running it.

[mitchconley]

jetting is 168 main, 42 piolot, FA screw 3.5 turns out, with airbox lid ON. didnt get a chance to look at it today but ill check my carb boots and such tomorrow

[CJM]

Check the throttle cable at the bars. Also check the idle adjustment.