Engine rev to max by itself

[tjfisher30]

ok guy what do i need to look into next cleaned carbs replace wrong jets that were in the carbs, check compression all good there, i would sync carbs but i cant get her to idle i fire her up she idles for a second then rev up fast so i shut it off of course , i dont have and leaks that i can find
ok guy what is it or what do i need to look at next ?

[Wbowen]

I have a issue with mine and the Idle was adjusted to about 1000 RPM and every now and then it would idle at 3000+ RPM. IT turned out to be an air leak into the carbs.

I hope this helps, if not sorry.

[tjfisher30]

ya maybe i look for it ok this is a duh question but here we go im not runnig the air box or filters right now will the cause me a problem? it all open carbs do they need the filters to run right?

[underdog57]

I've seen bad gas do weird stuff , not sure if you have fresh gas or not ...??
On my Mercury boat , I had bad fuel oil and it would rev on its own .I even killed the ignition and it revved up with no spark.
Put new gas in and all fixed !!

Good luck
Bob

[randy]

tjfisher30;

Your carbs are WAY out of sync. This can happen after a carb job. Even one carb being open too much will drag the others with it and run the idle up.

You first need to get the butterflys near the same opening to begin with, then you'll have a workable idle and can do the fine-sync with the mercury stick.

Do a search here for bread tie sync for an explaination. Use the wire from a bread tie as a feeler guage to set the basic butterfly opening(s)