Honda Grom banner
4 valve big bore
1-1 of 1 Results
  1. Grom Performance
    After beating on our koso 170 4 valve that we built a couple years ago, we decided to bump it up a notch to make more power but also make it as reliable as possible. In order to do that we had to go with a 63mm piston (forged of course) and a tad bit less compression to reduce the risk of...
1-1 of 1 Results
Top