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rapid vacuum changes

  1. rapid vacuum changes when hooked up to a carb synch

    V Star
    purchased a 2007 Yamaha v star 1100 off a friend, motorcycle barely idled and had been sitting for a while when i first got it so i replaced the 2.fuel pump 3. drained and cleaned the fuel tank completely and refilled with fresh gas 4. NGK spark plugs BPR7ES gapped between .28-.31 in 5. new K&N...