HOLIDAY SCHEDULE: We'll be closing early at 3:00 PM PST on Dec. 24 and will be closed on Dec. 25–26 in observance of Christmas. Wishing everyone a safe, happy, and wonderful holiday!
Koso Honda Grom 125 (ALL YEARS) Throttle Body Screw - Brass Replace the stock air screw on your throttle body with this high precision brass model. Made 100% from...
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES Koso 34mm Throttle Body for Honda Grom 125! Super large throttle body that will allow your...
Koso 30.5-34mm intake manifold for 2014-2020 Honda Grom 125! Pair this up with Koso 34mm large throttle body that will allow your big bore engine to breathe! Requires 30.5-34mm throttle...
KOSO 170cc Gasket Kit 61mm for Honda Grom 125KOSO 61mm Cylinder Head Gasket and Cylinder Base Gasket for the Honda Grom.Includes 1 Head Gasket and 1 Base GasketThis product is...
Koso Ignition Coil - Honda Grom (2022+) Koso's high performance ignition coils are designed using the most advanced materials on the market today. The stronger spark generated by the Koso...
As the throttle body and intake manifold are used to control the amount of air flowing to the engine's combustion chamber, they are important elements of the intake system. Using...
Koso Hurricane Racing Drop-In Replacement Multi Air Filter for Honda Grom MSX 125 (2022+). NOT AVAILABLE FOR SALE OR USE IN CALIFORNIA. Hurricane Racing Air Filter Want better...
KOSO 28mm Throttle Body (DY640000) for the 2021 and newer Honda GROM & Honda Monkey. As the throttle body and intake manifold are used to control the amount of air...
KOSO Injector Adapter Kit for 2014-2020 Honda Grom 125. This adapter is needed when you run the Koso Fuel Injector Part # (KOSO-1019) NOT AVAILABLE FOR SALE OR USE IN...
The main difference between the Koso Clutch Enhanced Lifter Plate and the stock one is it's strength. Koso's CNC Lifter Plate is stronger in order to provide better durability and...
Koso Hurricane Racing Drop-In Replacement Multi Air Filter for Honda Grom MSX 125 (2014-2020). NOT AVAILABLE FOR SALE OR USE IN CALIFORNIA. Hurricane Racing Air Filter Want...
Unleash the full power of your 150cc Big Bore kit by pairing it up with Koso's High Flow injector! Having the proper fuel for new performance upgrades is important! The...
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION-CONTROLLED MOTOR VEHICLES 170cc Big Bore kit with 4 Valve Cylinder Head kit for (2014-2020) Honda Grom MSX 125 and...
The new KOSO performance camshaft for Honda Grom 2022+ will give you great results at high RPM. This camshaft can be used with a stock engine, but will even...
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLESThe KOSO 4V Cylinder Head Kit for the 2014-2020 Honda Grom and 2019-2021 Honda Monkey is the...
KOSO 4 Valve Big Bore Piston and Rings ONLY Honda Grom 125 (Cylinder is NOT included)Replacement 4 Valve Piston and Rings for the KOSO 170cc 61mm bore. No cylinder is...
KOSO BIG BORE KIT 150CC - Honda Grom / Monkey 125 (2022+) with 5 Speed Transmission. Made from the best components available on the market, the 150cc Big Bore kit...
Koso's Mini-3 Air/Fuel Ratio meter is designed especially for Honda GROM 125 (2014-2021) using the OEM existing narrowband o2 sensor located on the right side of the cylinder head. Direct...
KOSO 61mm Replacement Forged Piston Kit 2 Valve Head - Honda Grom 125 NOT AVAILABLE FOR SALE OR USE IN CALIFORNIA. ANY ORDERS FROM CA RESIDENCE WILL BE CANCELLED...
The new KOSO racing air filter cover for 2022+ Grom models is not only easy to install, but it will increase the airflow, improve filtering efficiency and raise the engine...
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES KOSO 4 Valve Head Replacement Camshaft - Honda Grom MSX 125 NOTES: Professional installation...
Need to monitor your engine temperature? Koso's Mini 3 Cylinder Head Temperature meter is designed especially for 2014-2020 Honda GROM® which is the perfect addition for you. Its peak recall...
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES Koso Camshaft Kit - Honda Grom MSX 125 (2014-2020) 4 Speed Engine Koso Camshaft Kit...
KOSO Multi-functions digital plug and play speedometer for 2014-2020 Honda Grom 125 / MSX 125! This mini speedometer is the perfect addition for your Honda GROM! Eliminate the ugly, boring,...
The new KOSO performance camshaft for Honda Grom 2022+ will give you great results at high RPM. This camshaft can be used with a stock engine, but will even...
