Product Details
SPECIFICATIONS:
- Cylinder Displacement: 169.2cc
- Cylinder Material: Aluminum/Ceramic CoatedCylinder Overall Height: 90.5mm
- Piston Diameter: 61mm
- Piston Type: Forged
- Compression Ratio: 11.5 to 1
Want to unleash all the power your Honda Grom can handle? Koso’s 170cc Big Bore Kit (MB623002) is the perfect addition for you! The kit includes a ceramic coated cylinder, 61mm forged piston, rings, pin, gasket kit and banjo bolts. Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. Made from the best components available on the market, Koso’s 170cc big bore kit will amaze you! Also compatible with the Honda Monkey 125cc.
***Please Note: You may need to modify your engine case to accommodate the larger cylinder***
**MADE IN TAIWAN**
**NOTE: Electrical, High Performance, Aftermarket items are non-returnable so please check photos and specifications before ordering.
Please see our Warranty and Returns Policy
Additional information
| Dimensions | 12 × 9 × 6 in |
|---|---|
| Manufacturer Name | Koso |
| Manufacturer Part Number | 1286 |
| Part Number | 275800 |





