Big red high rev

[carsurgin]

My 83 big red will start and run fine. I can ride it for a while then it starts reving quite high. I have to just let bike propel itself off high rev (no throttle). It will burn off access then run fine again. Ive cleaned my carb, air filter. I have tried to adjust pilot screw and everything else i can think of. It does it, then dosent do it. so its hard to fix.
Does anyone have any ideas? My plugs will also get a lot of carbon build up, no fuel on it. I can run bike for 2 minutes or 2 hours and the plug will be the same.
Please help.

[carsurgin]

If Im not making sense or you need more info please let me know. I really want this fixed.

[MNATC]

Is the choke staying on somehow? Or a throttle cable sticking?

[rugman316]

Did you recently have the carb off? Its probably sucking air from somewhere. When that happened to mine the O-ring between the intake manifold and the carb was shot. There should be two O-rings one on each side of that intake piece. Hope that maybe helps

[rugman316]

Sorry I read it again it looks like you did have the carb off. If you didn't put new O-rings in I bet thats what the problem is. Seems to happen alot when the carb gets taken off to clean it.

[carsurgin]

I got word it may be air leak. when i hit throttle it dies instead of revving. I did not notice any O rings on the carb. I dont think it had any, i would have seen it. Thank you very much guys, i at least have something to look for.
Im sorry, im new at carbs (and noone knows bout them around here) where do the O rings go? I have the manual but it dosent mention anything about it.

[bigredridr]

possible crack in the boot between carb and engine

[carsurgin]

if its a crack in the boot, will epoxy hold or do i gotta get a new one? and also, can i use tube of Permatex "Ultra Copper" between carb and engine? its rated 700dF.
And how do i find an air leak if its not the boot or seal?