About Us


KOSO is synonym of quality and performance.

KOSO is synonym of quality and performance for more than 30 years! Designing and manufacturing high-quality products, we are well-known in the motorcycle, snowmobile, ATV and scooter industries. In fact, its good reputation for reliability and innovation capability made our company a source for many major OEM companies. Whether KOSO manufactures a product under private label, OEM or aftermarket product, the quality always remains a priority. Bringing new technologies and innovative product is also part of KOSO’s philosophy as well as constantly pushing the limit further.

For many years we’ve had the opportunity to work with the best team of engineers, testing equipments and production facilities. For these reasons, KOSO remains a leader in analog and digital technology. KOSO carries a wide range of quality gauges & accessories, heating equipment, LED indicators, mirrors and engine parts for your convenience. We are proud to offer you its complete line of products for serious riders.

Koso History

  • Creation of Chen Yah Industrial co., LTD
    Koso was only producing scooter performance parts.
  • ISO 9002 quality system certified
    See the Wikipedia page for more details

 You can find us at the following shows

  • EICMA Milan, Italy
  • Intermot Cologne, Germany
  • SEMA Show Las Vegas, USA
  • AIMExpo Orlando, USA
  • V-Twin Expo Cincinnati, USA
  • Tokyo Motorcycle Show, Japan
AIMExpo 2015

AIMExpo 2014


Tokyo Motorcycle Show 2016

Tokyo Motorcycle Show 2016