blow thru withn a stumble .help robert 1320

sounds like accel. pump issues, try adding a larger pump cam, if bringing it up to stage (about 2000rpm) then trying to whack it, you might have to move to cam hole 2 to activate the pump later in the throttle.....hope this helps

im gonna agree. def sounds like a accel pump issue or not big enough squirters.....

what size jets and whats your timing at?

50 cc acc pumps? and what cams are on the carb...for the acc pumps

Youre on the right track, first 3 things to start chasing are exactly whats mentioned above, acc pump cam, squirters or timing. Sounds like youre good on timing so its probably the squirters or cam. Call Kevin, he was pretty helpful. Took some work to get my stumble worked out but I eventually fixed it by changing cam and upping the squirters til it was happy.