Tecate High revs at Start Up

[smoknrv4]

What is causing this? It's a little unnerving because of the new rebuilt engine. I've put about 5-6 tanks of gas through now and it's jetted sweet but still has this high revving bs at start up. Anybody?
Thanks

[fabiodriven]

It's lean, that's for sure. You're going to have to figure out why before you run it anymore as that is a good way to do a lot of damage. Could be many different things, but take a look at the intake boot and make sure it's not cracked or leaking anywhere. That's a start.

[smoknrv4]

No leak at the intake, brand new and already checked all that. Also should mention it's only when it's cold, after that it starts fine the rest of the time.

[jeswinehart]

Do you shut your fuel off at petcock when done riding,,,, perhaps burn a little out of carb after shutting off ?
It may be just a wee bit fuel starved on start up.

[Shawn Powell]

My quadzilla used to blow base gaskets and do that. ( one of the MANY issues they had ) rev high cold warm up expand and seemingly run fine. Then blow up cause I was leaking air at load speed.


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[smoknrv4]

I'll recheck the torque on the cylinder base gasket. Also yes I shut off the fuel petcock all the time after running it.