Product Review

Fit on 38mm diameter downtube of bike frame ONLY because the Inner Diameter Max: 1.5"(38.1mm);
1):Compatible with engine front mounth 33mm Approx;if your engine front mounth is 41mm approx, you have to Drill the holes on pedestal to be wider by yourself; check the picture for reference;Compatible with 1.5" to 2" stud spacing and suitable for front mount bolt 6mm and 8mm,
2):For 66cc/80cc and 48cc 2-stroke bicycle engines Universal Mount for Bike Motors. Works on most newer bicycles and allows you to mount the motor without drilling through the frame.