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View Full Version : different jetting after rebuild?



paul_700
05-22-2008, 11:33 AM
I just got done breaking in my completely rebuilt 310 mx ported motor. I had the jetting rich for break in and now I'm trying to dial it in to go racing.I changed nothing else besides the rebuild but it seems like it wants to be jetted significantly leaner than it ever did before the rebuild. Is this a sign of something wrong or is it normal?

I returned it to my usual jetting I used before the rebuild and it now stumbles badly if I lug it a little out of corners where it would previously have the power to pull itself out of.

Think its just a jetting issue or something more?