just finished putting on a 70cc kit on my puch ( my second one, 1st one was on the old tomos.) my problem is that when i hit the gas from a dead stop, it bogs down, and dosent really go anywhere. once it hits about 10 mph, it takes off like hell, and runs great at top speed. The moped did the same thing with the old 50cc cylinder on it, so Im guessin its the timing, but adjusting it dosent seem to make any difference. I would much like to hear from somone who might be helpful!!