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    1971 mercury 500 thunderbolt (50 h.p.) ignition

    I remarked the flywheel with bright white paint and learned that of the 2 marks stamped into flywheel, the one about 75 degrees counterclockwise to the other is used to time the distributor to tdc. The other mark is used with the timing tape for timing events like throttle pickup and max...
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    1971 mercury 500 thunderbolt (50 h.p.) ignition

    I will check on that! I could not see a white mark on the flywheel as it was so greasy and dirty! There were 2 marks stamped into the flywheel and I set the base timing to one of those! #1 piston was at tdc and the tiny arrow on distributor pulley pointed at mark and center of crankshaft! I need...
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    1971 mercury 500 thunderbolt (50 h.p.) ignition

    I recently acquired this old mercury outboard and am trying to get it running well. I was able to get it started with some difficulty although it would only stay running at higher rpm (2000 or more). I completely disassembled the thing and cleaned and serviced everything I could! Lightning...
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