Koso 170cc Big Bore Cylinder Kit Honda Grom 125 Monkey 61mm Forged MB623002

The Koso 170cc Big Bore Cylinder Kit Honda Grom 125 Monkey 61mm Forged MB623002

Transform your small-bore ride into a high-performance machine with the Koso North America 170cc Big Bore Kit. Specifically engineered for the Honda Grom and Monkey, this kit increases displacement to 170cc, providing a massive boost in torque and acceleration. The kit features a high-quality aluminum cylinder with a ceramic coating for superior heat dissipation and a 61mm forged piston designed to handle a 11.5:1 compression ratio, ensuring your engine remains reliable even under increased power demands.

Take your street performance to the next level when you buy Koso Big Bore kits to unlock the true potential of your 4-stroke engine. This Honda Grom replacement cylinder kit is a comprehensive performance package that includes everything needed for the upgrade, including rings, pin, gaskets, and banjo bolts. Whether you are building a custom Honda Monkey service kit or looking for a MSX125 Grom SF power upgrade, Koso’s precision engineering delivers the displacement and durability required for serious enthusiasts.

Top Features Koso 170cc Big Bore Cylinder Kit:

• Ceramic Coated Aluminum Cylinder: Provides excellent heat transfer and durability compared to standard cast iron sleeves.
• 61mm Forged Piston: Offers superior strength and lightweight performance to handle the 11.5:1 compression ratio.
• Complete Bolt-On Kit: Includes the cylinder, piston, rings, wrist pin, gasket kit, and necessary banjo bolts for a streamlined installation.
• Increased Displacement: Jumps your engine from 125cc to 170cc for significant gains in horsepower and mid-range pull.

Fitment List:

2014-2020 Honda Grom 125 / ABS
2013-2018 Honda MSX125 Grom / SF
2019-2021 Honda Monkey / ABS

FAQ:

Q: Will this Koso big bore kit fit my Honda Grom 125?
A: Yes, this 170cc kit is compatible with all Honda Grom 125 models from 2014 through 2020, including the ABS and SF versions.

Q: Do I need a special exhaust to run this 170cc big bore kit?
A: Yes, a proper high-flow exhaust system must be used with this kit to prevent re-flow pressure and excessive heat buildup.

Q: Does this include the camshaft?
A: No, the camshaft is an optional upgrade; however, this kit delivers its best results when paired with a Koso performance camshaft.

Give your mini-moto the heart of a champion with the highest quality performance parts on the market. Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. the best motocross shop in Central Florida.