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THEHIGHAMS replied to the thread Mercury thunderbolt 500.

Mar 17, 2026
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THEHIGHAMS reacted to racerone's post in the thread Mercury thunderbolt 500 with Like.

Serial # for American models says it is a 1974.

Mar 17, 2026
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THEHIGHAMS replied to the thread Mercury 50hp thunderbolt 1974.

Used 2 compression tools both ready the same 90

Mar 15, 2026
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THEHIGHAMS replied to the thread Mercury 50hp thunderbolt 1974.

I think it might be the compression only 90psi on all 4 cylinders

Mar 15, 2026
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THEHIGHAMS replied to the thread Mercury 50hp thunderbolt 1974.

Yes

Mar 15, 2026
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THEHIGHAMS replied to the thread Mercury 50hp thunderbolt 1974.
Mar 14, 2026
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THEHIGHAMS replied to the thread Mercury 50hp thunderbolt 1974.

Followed this exactly what it says still won't tick over or rev up
Mar 14, 2026
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THEHIGHAMS posted the thread Mercury 50hp thunderbolt 1974 in Mercury & Mariner Outboards.

Hi help I have cleaned the carburettors set the primary timing 8' btdc.set the wot 35'. Set the wot screw and plate. New coil new spark...

Mar 13, 2026
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THEHIGHAMS reacted to WoodOnWater's post in the thread '72 50 HP 500, general tuning and timing. with Like.

Re: '73 50 HP 500, general tuning and timing. Re: '73 50 HP 500, general tuning and timing. I've got most of the procedure visualized...

Mar 9, 2026

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