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 the plug fires ok on the other cylinders.
Does anyone have any Idea's why the middle pot wont fire?
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 the plug fires ok on the other cylinders.
Does anyone have any Idea's why the middle pot wont fire?
