I have a Tomos ST with the A55 engine and I've been chasing an issue with it for a while.
It currently has a 70cc airsal kit and a Mikuni VM18 carb.
I've checked for air leaks with carb cleaner around all the mating surfaces and also a bunch of different jet combinations but still have the same problem.
On the stand the bike will idle great and the rear wheel spins fine with some throttle, but once it's off the stand it barely pulls at all. It'll go maybe 5 mph.
I've also done a gear oil change and took a quick peek around in the transmission, the clutch lining looks okay, but maybe it needs to be re-corked?
Has anyone seen this before? Is there something that I should be looking for here besides an air leak?