KOSO North America

For 2-stroke engines For use with wideband air/fuel ratio meters

Allows installation of O2 sensor into most exhaust systems

Measures 18 x 1.5mm

For use with air/fuel ratio meters

Aluminum bung plug washer works with any 18mm O2 sensor bung plug

CNC-machined for added strength over stock Adds durability and stability to clutch during installation and while shifting gears at high speed

Improves axial force Reduces risk of clutch slipping Includes high-tension clutch springs and discs

Our air box connecting tube has been developed to link the Koso 28 mm throttle body and the actual air box Fits Honda Grom® only, does not fit '22...

Combining throttle body with intake manifold will allow a better air/fuel mixture for quicker throttle response Control the amount of air flowi...

Combining throttle body with intake manifold will allow a better air/fuel mixture for quicker throttle response Control the amount of air flowi...

Highly visible, backlit digital display Allows more precise tuning Programmable warning alerts rider of too lean or too rich ratio Displays...

Used to control the amount of air flowing to the engine's combustion chamber If used with part# 1022-0290 will allow for a better air/fuel mixture...

Replace the stock air screw on your throttle body with this high precision brass model The perfect replacement for the plastic version from the...

Increases fuel in the combustion chamber 160cc injector for Koso intake manifold

Combining throttle body with intake manifold will allow a better air/fuel mixture for quicker throttle response Control the amount of air flowi...

Combining throttle body with intake manifold will allow a better air/fuel mixture for quicker throttle response Control the amount of air flowi...

Adapts fuel injectors to work with Koso intake manifold

Allows you to monitor and adjust air/fuel mixture for more power and peak performance Specially designed to help tune carbureted or fuel-inject...

Multi air filter intake increases airflow, improves filtering efficiency and raises the engine's output performance High-quality foam filter is...

Improve filtering efficiency and raise the engine output performance of your motorcycle Easy to install Air filter cover for part # DK640000 ...

Improve filtering efficiency and raise the engine output performance High-quality foam filter that is easy to assemble and disassemble Suitable fo...

Multi air filter intake increases airflow, improves filtering efficiency and raises the engine's output performance High-quality foam filter is...

Ideal engine part to complete Koso's big bore kit Unique four-valve design increases air flow and performance Provides more power and torque Featu...

Ideal engine part to complete Koso's big bore kit Unique four-valve design increases air flow and performance Provides more power and torque ...

Throttle body manifold gasket for use with OE or aftermarket manifolds

Replacement gasket kit for Koso 170CC Big Bore Kit

Increases the oil flow by 40%, helping to prevent engine failure Keeps the engine lubricated to optimize performance Recommended for bikes wi...

Optional camshaft kit can be used with stock engine, but delivers improved results when used with 170cc Big Bore kit Banjo bolt kit designed fo...

Can be used with stock engine, but for better results use with the Koso's 170 cc big bore kit APPLICATION INTAKE / EXHAUST INTAKE LIFT 8.50 ...

Optional camshaft kit can be used with stock engine, but delivers improved results when used with 170cc Big Bore kit

Compression ratio of 11.5 to 1

Includes ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts Compression ratio of 11.5 to 1 Optional camshaf...

Aluminum washer included Sensor not included

Aluminum washer included Sensor not included

Aluminum washer included Sensor not included

Aluminum washer included Sensor not included

Aluminum washer included Sensor not included

LED indicator in the mirror's shell Mirror dimensions: 3 -11/16" height, 1-1/2" depth

Large display mirrors for motorcycle These mirror fit M8 and M10 size with black matte stem and shell

Measures approximately 8-1/16" from farthest tip of mirror to stem base and 6-5/16" height Standard 10mm thread

Measures approximately 8-1/16" from farthest tip of mirror to stem base and 6-5/16" height Standard 10mm thread

Adjustable screws can suit any smartphone size, even those with thick cases Inductive charger allows you to charge your device without any conn...

Heated devices for the user that does not want to commit to changing their grips but still want to maintain the comfort of heated grips Easy pl...

Integrated thumb switch designed for easy installation and setting User can change settings without removing hands from the handlebar Plug-and-pla...

Clamp-on grips do not need adhesive External temperature controller For use with twist throttle; includes interchangeable throttle cams Req...

Integrated thumb switch designed for easy installation and setting User can change settings without removing hands from the handlebar Plug-an...

Integrated thumb switch designed for easy installation and setting User can change settings without removing hands from the handlebar Plug-an...