I went to the boat today and TRIED to start the engine. It kept turning over but would not start. I checked the plugs and they had a spark. So I checked the coil spark and it was yellowish but sparking. I loosened the bowl screw and gas was in the bowl. As I tried to start the engine, (using the choke on and off) it was backfiring out the flame arrestor. Is that the timing? But how? I did not touch the distributor, just changed the cap, rotor and plugs. Could the timing be off without touching the distributor? I believe the wires are correct, clock-wise 1,2,4,3, with 3 being in front of the alternator. What else can I check? Should I move the distributor? I also connected the timing light and and the tab on the flywheel under the off center bolt was pointing up when the light came on. That's TDC? Right?
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