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All pistons are measured in 3 ways. Please click on “View more images” for a diagram of a piston showing the areas we have measured.
1) Compression Height (CH) is measured from the center of the wrist pin chamber to the surface edge of the piston.
2) Piston Height (PH) is measured from the bottom skirt of the piston to the surface edge of the piston.
3) Piston Diameter (PD) is measured on the collar closest to the surface edge of the piston.
Note: The “dome” area of the piston is not included in any measurement however the “dome” area does effect the displacement of the engine.
Before ordering any piston you will need to verify that the piston you are replacing matches the 3 measurements above.
39mm for QMB139 49cc 4 Stroke engines
Piston Diameter = 39MM Piston Height = 32MM Compression Height = 18MM . Includes Piston, Rings, Wrist Pin and Circ Clips.
47mm for 80cc upgrade kit for QMB139 4 Stroke engines
57mm for GY6 150cc 4 Stroke engines
Piston Diameter = 57MM Piston Height = 39MM Compression Height = 21MM Includes: Piston, Rings, Wrist Pin & Circ clips.
47mm for QM50QT-B2 50cc 2-stroke scooters (+$9.00)
Piston Diameter = 41MM Piston Height = 47MM. Includes: Piston, Rings, Wrist Pin & Circ clips.
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