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  1. K

    After an hour or so, motor begins to spit and sputter off idle

    1987 Mercruiser 4.3L / 185hp / Alpha One. I recently ran into a new problem that seems to be ignition related but I'm not positive. I was lake testing the boat after replacing the impeller for a previous overheating problem. After running the boat for about an hour (about 30 min in no wake...
  2. K

    87 Mercruiser 4.3L overheating at at idle

    Looking for help. Anyone have any suggestions? I have an 87 mercrusier 4.3L w/ Alpha One that recently started to overheat at idle and no wake throttle. When cruising 1/2 throttle and more, the temp remains 165 - 170. However, during no wake zone and idle, temp climbed to 200-210. I've...
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