Help... motor wants to idle WAY too fast.

[EvanB85]

Ok... quick background: 6m6 stock internals. Protec Mach 1 Pipe. Enhancer with rev limiter maxed - ran great last year.

Now, new for this year: fresh rebuilt single 44 from JSS (stock jetting.) All new fuel lines with new primer. And... new (old) ocean pro head.

I know I'll need to do some jetting changes, but I wanted to fire the thing to at least get a baseline and make sure I got everything back together (I'm an amatuer mechanic at best.) As soon as it turned over, I jumped to what seemed like redline, and in fact it basically started dieseling. No good. Compression went from stock (155) to 180. I'm on 93 gas.

So, is this a way too high compression issue? Seems like a bigger problem than can be solved by just re-jetting.

 

[MADMAT]

If you have done nothing else it is clearly a air leak on the carb re-installation IMO.

 

[steveyz250fpilot]

air leak is my first guess also

 

[EvanB85]

Hmm... double check carb/manifold gasket I suppose

 

[cmeripper26]

Check the mating surface on the intake manifold, both the carb side and case side to see if the gaskets are sealing all the way around on the install. This definately sounds like a nice little air leak.

 

[EvanB85]

Well that sounds like a good place to start troubleshooting. Thanks.

I don't actually need a sealant on those gaskets, do I?

 

[Crab]

If it happens again and the stop button wont kill it, pull the throttle wide open. Jetting should be the same unless you never changed it.

 

[MADMAT]

Or put your foot over the exhaust.

 

[Kennay]

Make sure your throttle cable isn't adjusted too tight

 

[EvanB85]

If it happens again and the stop button wont kill it, pull the throttle wide open. Jetting should be the same unless you never changed it.

Yup, that's how I killed the first time. I tried a couple more times and the stop button was able to shut it down.

Make sure your throttle cable isn't adjusted too tight

Throttle cable is good.

 

[cmeripper26]

No you don't need any sealant in the intake manifold on either side. Any luck with checking the mating surfaces?

 

[Mark44]

Pressure test!

Mark44

 

[Waternut]

x2 on the pressure test... You never know what else could've creaped up over the winter. IF you rode it last weekend and it was fine, ok. If you rode it last season, could be a lot of things.