TB High Performance Camshaft for use with either the stock bore or our 186cc Big Bore Kit.  Similar specifications as the the DCR Cam and is about 1/3rd of the the price!  As with all our cams, the quality is also exceptional and not a regrind OEM cam.

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

Complete Engine Standalone Computer for all FinBro BBKs and all FinBro engines. Very positive success when used on the 125cc engine with multiple upgraded modifications along with the proper PCX150 injector

Has been found to also work with other manufacturer 2v and 4v BBKs when paired with a larger injector and OR upgrading to a larger fuel line if more fuel is needed.

Keihin self learning ECM refreshed for FinBro has a RPM limiter set at 12,500 RPM, instead of the OEM 9,500 rpm that is set in the original GROM/MSX125 ECM. It is capable of self adjusting fuel trims and ignition tables while you ride to deliver an accurate and safe performance, it is a completely autonomous system....no more software updates, data cables, laptops, secondary sensors, building/searching or asking for maps needed. It will automatically learn and store the adjusted fuel trims and ignition tables by itself using the OEM O2 sensor already on the engine. It will automatically add or remove fuel to all changes made to an engine, including boosting engine power: big bore kits, 4 valve heads, intakes, exhausts, cams, larger heads, pistons etc. The base data is also programmed for a more agressive engine at higher rpm's.

This ECM is not equipped with cold start circuitry, so using slight throttle operation is normal for the first few moments when starting in colder weather. A minor adjustment on the wire loom is required and an extra female end jumper wire is provided for you. It involves re-routing only 1 wire, and disconnecting 1 wire depending on your year model.

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.

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.

Fits Honda Grom and Monkey 125

Our Koso 4V Head Kit is the ideal engine part to complete the Koso Honda Grom® Big Bore kit. Because of its unique 4 valve design, the air flow and performance are increased. This new designed head is the perfect addition for those who desire more power and torque. The 4 Valve Head Kit features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves. Only fits Koso 170cc big bore kit.