All chinese scooters use either the gy6 engine in a long or short case. Or they used the Loncin engine.

 All chinese scooters use either the gy6 engine in a long or short case. Or they used the Loncin engine.

all chinese scooters mirrors and brake stay/handles are the same. and interchangeable

gy6 is original Honda manufactured in the early 80's, and then licsensed to other manufacturers

Loncin is original Honda manufactured in the early 80's and was also licsensed to other manufactures

but both are "Honda Clones"

loncin varry over thier respective manufacture origin, such as some were altered to include a clutch, some have a 4 speed shiftable gear set. Some have a selectible gear set, but with and auto clutch..

But both engines originated From Honda engineers.

The honda z50 was the first "Loncin" engine, but was not named that until it was sold/licsensed to others..

50, 125, 150 gy6 aare interchangeable, top ends and bottom ends. //My comment, dont think this is correct.Parts on the 125 and 150cc do not interchange with smaller motors. //

200cc gy6 and up sizes are on thier own, and do not interchange with the 150cc and lower models.

There arte 12 different camshafts for optins in the 150 and lesser size engines. A1 thru A6 are stock options, and A7 thru a12 are performance options.

all cranks are the same, all cam chains are the same, cylinder heads are the same other than the center bore.

Piston rods are different only in length.

160,170 and 180cc kits are available but require a slight case millimg mod to fit the case properly.

A 125 or 150 engine case can accept this upgrade and mod, but the 50cc can not. because the piston rod is too short.