<HTML>I've never used the tomos 70cc kit but I've heard that it fits better then the puch one being that the carb doesn't really fit between the carb arm and the frame of the moped.
when I added just the piston, cylinder, and head leaving stock carb (bigger jet 68) and stock muffler (mistake) I had many problems with the kit.
I now believe these problems where a result of that lack of a bi turbo muffler.
the extra oil built up in the muffler and was sucked back into the cylinder not only locking a ring up but scoring the piston quite badly. I had it machined and ran it for two day when the same thing happened.
If you use the whole kit, carb, muffler, piston the whole shot I've been told they run quite well, but they look modified and hence not legal.
going speed of 50 miles an hour on my puch was great!
swarm and destroy
Is it really worth spending $350 on a 70cc expansion kit for a Tomos moped? </HTML>