186cc Big Bore Performance Kit (64mm):

– Ceramic coated all aluminum cylinder (no steel sleeve)
– Lightweight 64mm piston with rings, pin, & clips
– Head gasket kit

This is the biggest bore kit on the market! The all aluminum ceramic coated cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). This new big bore kit will provide the extra power to make your new Grom a lot more fun to ride!  High quality parts and requires no machining to the cases.

There are no installation instructions, but if you can replace your piston, you can install this kit as the parts are installed in the same manner as the OEM parts.  However, its recommended that a professional install this kit.  It also must be used with an aftermarket fuel controller to prevent a lean condition and damage to your engine.

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California.

RC Super 2 Complete ECU

Dual-core design, calculation speed up 50%

More accuracy operation of injection and ignition timing

Weight reduce 12%, heat dissipation10%

Can be extended several professional race kits and modules

Support all NA modified of the engine

3D Injection can be adjusted

3D ignition timing can be adjusted

Unblock rpm limited, support rpm to 16500rpm

Vehicle standard control strategy, include temperature, baro....etc. compensation

Support many popular bike model, free download map and increase performance

Increase power at least 10% by the stock engine 

Plug and Play

100% stock ECU connector, no need to cut or modify the stock wire 

Meet IP67 vehicle standard

 Autotune function ( AF1 wideband AFR module is necessary)

*Aracer fuel management products are NOT compliant with the California Environmental Protection Agency (E.P.A.) or California Air Resources Board (C.A.R.B) for use on public roads or lands. Aracer products are for closed-course competition use only.

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California. 

*Fits 2014 to 2020 Honda Grom

Want to unleash all the power your Honda GROM® can handle? Our 170cc Big Bore Cylinder kit for Honda GROM® is the perfect addition for you ! The kit includes a ceramic coated cylinder, 61 mm 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, our 170cc GROM® big bore cylinder kit will amaze you!

Cylinder displacement 169.2 cc

Cylinder material Aluminum / Ceramic coated

Piston size 61 mm

Piston type Forged

Compression ratio 11.5:1

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California.

WARNING

THIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. KOSO IS NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS. ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALFUNCTION.

This complete 170cc Big Bore kit with 4V Cylinder Head kit is the perfect add‑on for all horsepower enthusiast looking for performance! It includes : a 170cc ceramic coated cylinder, forged piston, performance camshaft, bearing, rocker arms, 4 valve cylinder head, intake manifold, gaskets, and more. All parts are made from high‑quality components for reliability and durability that allow you to put your mind at ease and ride with confidence!

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California.

WARNING

THIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. KOSO IS NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS.  ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALFUNCTION.