34 or 36mm flatslide

i feel anything above 30mm with what you described will not do well.. too much carb will hurt bottom end in a big way...everything needs to match up..

talk to the mini bike guys almost daily with carb issues.. throw a big slide carb on a stock predator,, does it run better,, well yeah almost anything will run better than the air box set up comes with... but its not right, we can install a carb almost half the size and run circles around it and still look stock..
 
i feel anything above 30mm with what you described will not do well.. too much carb will hurt bottom end in a big way...everything needs to match up..

talk to the mini bike guys almost daily with carb issues.. throw a big slide carb on a stock predator,, does it run better,, well yeah almost anything will run better than the air box set up comes with... but its not right, we can install a carb almost half the size and run circles around it and still look stock..
Smaller than 30 mm on a big block Jerry? lots run a 38 mm sbn
 
blind man... didn't realize it was a 390 series engine...lol
disregard the first part of my post
the mini bike part is still correct on the 212's etc..
 
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