New to Powersport Superstore? Try our Year-Make-Model search and find the right parts for your ride by clicking "My Garage" on the upper-right! ➡

Koso North America MB640000 150CC Big Bore Kit

SKU: 8658206

Koso North America MB640000 150CC Big Bore Kit

Koso North America
$537.95
$537.95
Sale Sold out
/
Shipping calculated at checkout.
In stock and ready for shipping
This is a pre order item. We will ship it when it comes in stock.
Includes a ceramic coated cylinder, 61mm forged piston, rings, pin, pin clips, gasket kit, and banjo bolts. Compression ratio of 11.5 to 1 allows the use of premium pump gas to keep the reliability of the stock motor.

Vehicle Fitment:

2022-2025 Honda Grom
2022-2025 Honda Grom ABS
Secure, Trusted, and Encrypted

Protected by industry-leading 256-bit SSL encryption and backed by Shopify’s PCI DSS–compliant infrastructure. Every page, click, and transaction is encrypted and monitored for threats — so you can shop with confidence knowing your data stays protected.

Parts for Every Machine

We stock aftermarket parts, gear and accessories for motorcycles, ATVs, UTVs, snowmobiles, personal watercraft, and even performance cars — all backed by expert support and live inventory.

Real-Time Fitment Accuracy

Search by Year, Make, and Model with confidence. Our proprietary vehicle fitment system ensures you’re only shown what fits — no guesswork, no returns — just parts that fit.

Fast, Trackable Shipping

We ship from over 20 U.S. warehouses — often same or next business day. Every order includes tracking and transparent fulfillment updates from start to finish, all processed through a secure, encrypted checkout.

Quick Links

Ride With Us. Stay Connected.

Follow us for real-time fitment updates, gear drops, and pro tips from the garage. No spam, just parts, tech, and news for riders like you.

Your Garage

Add a Vehicle