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  1. W

    Yamaha 8hp 4-stroke cooling issues

    Model number is not known as the original transom clamp sticker is missing. It is most likely an F8MH approx 2006. The owners manual has no mention of a warning alarm system or overtemp protection system.
  2. W

    Yamaha 8hp 4-stroke cooling issues

    There's no temp alarm, or rev limiting feature. I understand the telltale is just one of the exit points for cooling water, the point is the telltale is working perfectly revving to maximum rpm in neutral, and at low rpm in gear, there is no overheating in these instances. The telltale...
  3. W

    Yamaha 8hp 4-stroke cooling issues

    I bought it cheap recently with the cooling issue known. I tested in a deep bucket and at sea (transom height is correct), as the only time I could replicate the problem was under load. No issues when running in the bucket.
  4. W

    Yamaha 8hp 4-stroke cooling issues

    Hi all, I have a 2006 Yamaha 8hp 4-stroke with a difficult to pinpoint cooling issue. At mid-high RPM with the engine under load, flow disappears from the telltale. I can rev the motor to the limiter in neutral and water flow remains perfect, the issue only occurs in gear and only at higher...
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