KOSO NORTH AMERICA - MB640000 - Big Bore Kit - '22 Honda Grom 125, Monkey
Koso North America's Big Bore Kit bumps displacement on '22 Honda models while keeping the compression ratio low enough to run on premium pump gas and preserve the reliability of a stock motor. The kit includes an aluminum, black powder-coated cylinder, a 54mm forged piston, rings, pin, pin clips, and a full gasket set, giving builders everything needed for the top-end swap in one package.
Features
- Compression ratio allows the use of premium pump gas and keep the reliabilty of a stock motor
- Kit includes aluminum black powder coated cylinder, 54 mm forged piston, rings, pin, pin clips and gasket kit
Specs
- Material: Aluminum
- Displacement: 149 cc
- Product Name: Cylinder Kit
- Style: Big Bore
- Units: Kit
- Engine Type: 4-Stroke
- Riding Style: Street
- Color/Finish: Black
- Compression Ratio: 11.38:1
- Color/Finish: Powder-Coated
Frequently Asked Questions - KOSO NORTH AMERICA - MB640000 - Big Bore Kit - '22 Honda Grom 125, Monkey
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
