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  1. BB63QM

    70’s Mercury 850 Thunderbolt - Distributor Wires

    I have an 850…works fine (although the rpm’s are a bit high), but I am concerned about the 3 wires from the distributor to the Switch Box Assembly. The wires are worn at the point where they enter the Distributor Body. I soldered one that was sheared off flush and supported others to prevent...
  2. BB63QM

    LU 1655-7332 Parts Diagram?

    Does anyone have a parts diagram for lower unit number 1655-7332, which is on my 1973 850 Thunderbolt? Spec’s part is 1655-7333, so perhaps mine was made with leftover parts or got a replacement in the last 50 years. Anyway, time to replace the gears, so need part numbers (I ordered for the...
  3. BB63QM

    Prop Locking Question (Reverse Locking Cam?)

    I'm new, so bear with me. 1973 Thunderbolt 850; just purchased and rebuilt carbs and in boat electrical. She starts, but only on ether (suspect is weak spark due to old plug wires---solid copper replacements on order), but the prop does not seem to free up in Neutral as i would expect...its not...
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