I have a schwinn High timber 26" bike with:
26 x 1.95 semi slicks
415 chain with 41t sprocket and rag joint
thatsdax premium f80 engine 66cc(60 something cc)
upgraded chain tensioner with a 10t sprocket off ebay
nt carb, stock jet size #70, clip is in center position
low profile SBP air filter...