Reply To: Timing a 6HP Johnson 1989

[joesnuffy]

Bill,

Thank You and all you guys for your input. I borrowed a flywheel remover from my friend here in St Pete he owns a Marine shop where they fix outboards. I told him the motor ran smooth when that cylinder was not being used and the plug was out. He had the same kind of thoughts you had that the motor that the bottom cylinder was pre-firing. I fixed a motor once that had wasted spark and it had a sheared flywheel key but would still run and run pretty well just couldn’t get it to run and idle correctly. I thought/hoped that might be the case for this engine but all wiring under the flywheel looked good no burning of wires. When I returned the flywheel puller he asked was the key sheared and I said no he said to check to make sure whom ever replaced the coils didn’t wire them backwards I eagerly did switch them around but that was a no go also so I switched them back.

When I was trying to see where the plugs were firing I was putting the piston close to TDC using a small screw driver then turn the flywheel about 1/2 turn backwards and spin it 1/2 turn clockwise and when I did that it seemed like the bottom cylinder was firing 180 degrees off but I will have to revisit the flywheel has to be spun a lot quicker for spark than with points. When I pulled the flywheel using a rope as slow as I could it did seem like both plugs were firing at the same time but that is very hard to tell but I will re-visit it. I don’t have an open spark plug gap checker here in FL but I will widen the spark plug gaps and have a look.

I did reverse the coils and couldn’t get it to run so maybe they are alternating spark but maybe not correctly but I will re-visit that today and I will try harder to see if plugs are firing at the same time. I am also going to see if I can get the bottom cylinder to run with top disconnected at any speed. I will start it today with bottom plug out and record it running with it out and with it in. I think I will also change the bottom coil to the top and the top to the bottom to see if it might be a coil.

Thanks for the help,

Joe

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