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air injection

  1. Whistling ?????

    Engine / Exhaust / Cooling
    OK so, I have both coastered AND marbled the 750. I still get popping and some backfiring. I'll have to double check the gaskets! But I digress... I havent really torn into it yet, but I think the air injection system is causing the bike to whistle, like the Jetson's space-mobile... Anyone...
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