DHMotoring Stock Bore Racing Piston for the 2022+ Honda Grom and Monkey delivers a significant compression boost without requiring a bore kit — a direct bolt-in performance upgrade for your 125cc engine.
Key Features
- ~13:1 high compression ratio for increased power and throttle response
- 50mm stock bore — no machining required
- Larger ring and skirt oiling holes for improved lubrication
- Larger oil spring for better ring seal
- OEM-sized skirt area for proper fitment
- Complete racing piston ring kit with pins and circlips included
- Base gasket spacer and head gasket included
- Compatible with clear big valve head (27/22 valve diameters)
Requirements
- Requires NGK CR9E spark plug
- Minimum 91 octane fuel required
- ECU flash or engine management system required (aRacer or equivalent)
- Professional installation highly recommended
- Ring gaps must be set prior to installation
- Base gaskets must be installed properly — setup sheet included
Recommended Ring End Gaps
- Top ring: .007″–.008″
- Bottom ring: .009″–.010″
Specifications
- SKU: DHM-HCSBP-22
- Weight: 0.6 lbs
- Fitment: 2022+ Honda Grom (JC92), 2022+ Honda Monkey
- Vendor: DHMotoring
