Predator 212 surging at high governed RPMs, 38 main jet

[Caden T.]

Hi yall, been tuning the predator getting ready for some box stock racing. Recently put on a performance AF and 38 main jet. Ran good until we started hitting the higher governed revs and it started surging really bad.

Carb is clean and engine is close to brand new.

Haven't done any adjustment to the Idle or Air fuel ratio screw, wanted to get some advice first.

My theory is that somehow the governor is interfering or that the mixture is way to rich/fuel heavy. But everyone online reccomended this setup so idk.

Thanks in advance!

 

[flattop1]

What rpm is it surging at ?
Is this on the stand or under load .

 

[Caden T.]

What rpm is it surging at ?
Is this on the stand or under load .

Surging at around the top speed for the governor, so like 3400 to 3600 rpm. And under load going for top speed runs.

 

[CarterTalley]

There is no air fuel mixture screw. That is what you are adjusting with the jet. The screw on the carb is idle adjustment and the one that limits the throttle is the gov adjustment. I would just back the gov adjustment out to what you are supposed to be running if I understand your question.