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not firing

  1. Rear cylinder backfire, doesn't fire on idle.

    Engine / Exhaust / Cooling
    So my problem with my 1997 Vulcan 750 is that the rear cylinder doesn't fire all of the time on idle. It will fire when on the throttle but backfires once u let off. Any ideas as to why this is occurring would be greatly appreciated. Just bought it and other than this, a small oil leak is my...