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  1. M

    Yamaha 2 stroke 70 HP 1996 - Ignition coil resistance

    Just trying to confirm the OHM resistance measurement for the ignition coil. Have measured the primary coil resistance (Black/White -Black) and get 0.9 on coils 1, 2 & 3 Have measured secondary coil resistance (Black/White -High Tension Cord) and get 4.61 to 4.64 on each coil. I think the...
  2. M

    Yamaha 70 HP 1996/7 2 stroke Loses Power under load

    Went out in boat, fixed overheating problem but got boat up to around 3500 revs and power died boat still managed to tick over but when in gear and 3/4 throttle there was no power at all. Bought throttle back to idle then back up to low revs and boat moved forward. I tried revving motor and...
  3. M

    Compression Yamaha 70 HP

    Did a compression test on Yamaha 70 HP 2 stroke 1997. Got a reading of 117, 115 and 110 just wondering if this seems okay. Test was done both while engine was cold and then when it was warm and the readings were very similar.
  4. M

    Yamaha 70 HP Overheating problem

    Have a 1997 70 HP Yamaha 2 stroke. Having overheating problems. Have replaced impeller, checked thermostat is opening, pulled bottom leg off and had hose stuffed up water intake pipe and water seems to be getting up into cylinder head water jacket. . Have removed cylinder head and exhaust...
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