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  1. Grom Builds
    I was looking on Facebook market place at used big bore groms. Are they a bad idea to buy them used?
  2. 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...
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