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  1. General ATV Discussion
    Hey guys I recently put a 478 athena big bore kit on my quad and I was trying to get some opinions on what you guys use for the main jet. I ride in and around Ohio (elevation reference) any help would be appreciated TIA
  2. Yamaha ATVs
    So I have a 2008 Yamaha yfz450 with Yoshmira comp series full exhaust setup, and K&N air filter. It currently has a JDJetting 175 main jet in it but it’s running lean and backfiring everytime I let off throttle it backfires and occasionally even shooting flames. The K&N calls for a 210 main jet...
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