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  1. 6

    '75 850 thunderbolt won't start only back fires

    Finally got the starter fixed and it's now cranking at 325 rpms!!! Most life I've seen out of it yet. Primed the bulb cranked with choke and warmup forward for about 10 seconds and BAM she back fired through the exhaust? Timing is dead on to manual specs don't know where to go from here. Kind...
  2. 6

    75 mercury 850 thunderbolt smoke from carb

    I recently purchased a used boat with a "running" 850 thunderbolt. When it arrived I couldn't get it to start for the life of me. Upon further inspection I found all the wiring needed to be replaced along with all fuel lines and carbs needed rebuilt. After I did all of that I still couldn't get...
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