Product Details
Description
Polini 1st Oversized Piston (70cc Bore Kits); Honda Dio, Sym is a replacement piston assembly for compatible 139QMB scooter engine repairs or rebuilds.
Key Details
- 204.0684
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 70cc
- Engine Code: 139QMB
- Fits Models / Common Applications: Honda and SYM and other compatible models may apply.
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Will this fit a Honda?
A: This SKU is listed with Honda model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 70cc scooters?
A: This SKU is listed with 70cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.5 lbs |
|---|---|
| Dimensions | 3 × 2.5 × 2.5 in |
Polini replacement piston for 70cc sport 12mm CPI (46mm) cylinder kits for Honda Dio, SYM DD50 and 2T Minarelli engines.
NOTE: This piston is not compatible with Polini Sport 10mm (47.6mm) cylinder kits.
- Piston: 47mm
- Wrist pin: 12mm
- Includes: piston, piston rings, circlips, wrist pin
| Honda Dio | SYM DD50 |
| Minarelli 2T horizontal engines | Â |
About Polini: For over 50 years, Polini has stood unparalleled in the racing and tuning scene. Polini has powered both off-road and road racing legends to multiple MXGP and MotoGP world championships including the legendary Valentino Rossi. Polini sets the standard for high-end tuning and top-quality performance components.
This product is intended for off-road use only.
This product is not intended for use on public roads or land.
This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.
*Performance upgrades are considered racing parts and are not covered by warranty.





