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  1. R

    1974 Mercury 650 3cyl thunderbolt wont fire on centere piston

    I have this 1974 US version Mercury 3 cyl thunderbolt 650 That wont fire on the middle piston< i have done a compression test on all 3 pots and all are 120 PSI I seem to have spark on the middle pot and Ive cleaned the Carbys. I have also swapped the plugs around incase it was a faulty plug but...
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