Scarface5029
Member
I was wondering if this carb I bored to around 690 would be too much for my predator 212 with cm cam, a little head porting on both intake and exhaust, 26lb springs and the rest of valve train is stock, billet rod and flywheel, 32 degrees timing, 3910x plug, .930 id big dog header, head shaved a little and .09 head gasket, I’m running 110 race fuel with about 5% of methanol mixed. The main is a 38 that I took out my Dover stock carb and the low speed I took out also but not sure the size. Would these jets be good for the bigger bore carb or should I go bigger on the jets and what e-tube should I run or size? I notice some of the tubes have more holes than others and the e tube out of the Dover carb has fewer holes than the stock sp carb I bored. The Dover carb the jets come out of is a 615 bore and the motor seems to run good on it but feel sluggish over 6,800 rpm all the way to around 7,500 (the cm cam is rated to 7,500) and the plug looks like it’s running a little lean after wide open running and pulling the plug boot off to do a plug check. Also what other modifications should I do to this carb? This is my first time boring one and not sure of what else needs to be done internally besides changing the stock jetting. Thanks for any/all help/advice.