carb questions

[markvette]

got the new motor in and running good. couple of questions. i have a 12 to 1 wiseco piston, web stage 2 cam and high dollar port job. should i run race gas, figured i should since the motor is air cooled. right now i am mixing 3 gallons 111 race gas to 2 gallons regular. also since i put the new motor together it has a sputter at about 1/4 throttle. after that it screams. i am running a stock 400ex carb with 142 main and 40 pilot and needle in stock position. i am at about 100 ft elevation. my son raced it last weekend. he has to run beginner class locally with all 450's. he beat 2 out of the gate and caught the other 2 by the first corner.

Mark

[dork]

did you run that carb before? you may need a richer pilot with the cam and porting. try cracking the choke while its sputtering and see what it does.

thats awesome with the start, i'm sure the others were like :confused:

[SET THE STAGE]

you probably should run race gas with that 12:1 piston. it'd be for the better.

[Scott-300ex]

You prolly don't need race gas but you can run it if you want.

And run half and half, thats wut everyone around here does, and I mean everyone cuz I filled up their cans at one point in town, 1 gal 93 1 gal 110.

I'd go up 2 on your pilot to a 42.