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Aircooled Lifan engine 50cc.
This is the original engine as mounted on the streetlegal Apollo Orion.
Original cylinder Diameter cylinder: 39,0mm.
Valves are pre-adjusted, so it is ready to mount and use.
Color : Chrome
Color : Black
Metric 0.02-1.00mm Thickness Gage
M20 (thread pitch 1.5mm)
M20 (thread pitch 2.5mm)
Fits models with waterproff plug