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  1. C

    Carb flooding after rebuild

    4.3L Mercruiser Thunderbolt V with 2 BBL. I rebuilt the carb (upper and lower) this week after finding a damaged accelerator pump. Carefully disassembled and reassembled with assistance from my Seloc Manual. This morning, after reinstallation, the engine ran fine for about 15 minutes which...
  2. C

    Mercruiser won't crank/start after tune up

    Performed a tune up on my 18' Crownline with a 4.3L thunderbolt V Mercruiser I/O. Replaced the distributor cap, rotor and spark plugs. Initially the motor would not turn over; it just cranked endlessly until I applied some throttle and it finally turned over but would not stay running and died...
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    Drive slips out of gear at 1700 RPM.

    I have a 4.3 liter Mercruiser Alpha One I/O and upon throttle up, at 1700 rpm, i lose "thrust" and the boat slows back down while the RPMs continue to climb. There's no clunk or any other sound that I can hear other than the engine revving up. When I bring the throttle back down, the prop...
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