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  1. W

    Boat bogs down after 30-90 minutes

    Got the boat back in the water and it runs really well. I still have engine temperature concerns, however. It has a new 142 degree thermostat and when running at around 4200 rpm, that is where it stays. But at trolling speed or 5500 rpm, it runs at 220 degrees. I have verified these temps...
  2. W

    Boat bogs down after 30-90 minutes

    Thank you very much!!
  3. W

    Boat bogs down after 30-90 minutes

    So, bent valve and push rod @ #3 cylinder exhaust side. Had both heads flattened and bent parts replaced. Got it put back together and started it today but need to set the timing, with a light. I have an older basic timing light. This is a Thunderbolt IV and timing should be set at 8deg...
  4. W

    Boat bogs down after 30-90 minutes

    I took the boat in to a marina and they found no compression in number 3 cylinder. I pulled the head and have a bent push rod and bent valve stem. What are some possible causes for this?
  5. W

    Boat bogs down after 30-90 minutes

    1990 25' sylvan cabin cruiser stern drive, Alpha I 350, 260hp. Heard boat run before purchasing, sounded good, Aug. 2022. First time out it overheated quickly under full throttle and smoked like it was on fire. Since then........new, fuel filter, water seperator, thermostat, coil, distributer...
  6. W

    Boat bogs down after 30-90 minutes

    Sorry, just saw that engine questions aren't allowed.
  7. W

    Boat bogs down after 30-90 minutes

    1990 25' sylvan cabin cruiser stern drive, Alpha I 350, 260hp. Heard boat run before purchasing, sounded good, Aug. 2022. First time out it overheated quickly under full throttle and smoked like it was on fire. Since then........new, fuel filter, water seperator, thermostat, coil, distributer...
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