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    My boat run slowly. 120HP,2.5L,1989

    Can I apply Yamaha combustion chamber cleaner? How?
  2. L

    My boat run slowly. 120HP,2.5L,1989

    There is an thread to add some cleaner into cylinder and the compressures was up. Can I do so? https://forums.iboats.com/threads/mercruiser-120-2-5-compression-readings.664246/ ***†**†*%%*****†************†** OK, here's the update: I soaked all cylinders with Yamaha combustion chamber...
  3. L

    My boat run slowly. 120HP,2.5L,1989

    I did set the timing according to the following video , 13,4,2 will be fired. Really I did not know anything about dwell. Could you please explain me how to set dwell? and I went Canadian Tire store and asked for dwell and nobody knew about it. Also what is the cost rebuilt the cylinders?
  4. L

    My boat run slowly. 120HP,2.5L,1989

    How?
  5. L

    My boat run slowly. 120HP,2.5L,1989

    Could you please guide me do the investigation?
  6. L

    My boat run slowly. 120HP,2.5L,1989

    The engine fires very well with the new spark plug and the new ignition system components. I also set the correct timing. But boat still run only with the maximum speed of less than 10mph. and the third cylinder pressure is 110(cylinder is warm) and 100(cold). How can I fix the issue of slow?
  7. L

    My boat run slowly. 120HP,2.5L,1989

    I have got my new ignition tune up kit and I have also installed it. But the old one should work
  8. L

    My boat run slowly. 120HP,2.5L,1989

    So sad for the third cylinder. Its' pressure drop from 120 last year to 100 this year. What reason caused the dropping?
  9. L

    My boat run slowly. 120HP,2.5L,1989

    I have ordered the distributor tune up kit in Amazon. it will be deliveryed in Jun 30.
  10. L

    gimbal bearing house hit by trailer while emergent braking before red light.

    Yes. that is excess grease
  11. L

    My boat run slowly. 120HP,2.5L,1989

    Should I replace this because it is not complete open.
  12. L

    My boat run slowly. 120HP,2.5L,1989

    I did another timing setting by multi-meters with beep function. It continued to beep even there is a obvious gap. So I stopped when it changed from 0.3 to 6.9 and mounted the cap and connected the line to spark plug. also I started the motor. it worked. I will do a water testing and check it...
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    My boat run slowly. 120HP,2.5L,1989

    Can anybody confirm my timing setting correct or not? I stopped at the multi-meter changed from 0.3 to 6.7. Before doing the timing setting, I have put the yellow line at the 0 postion(seen the first pict). My multi-meter does not have the function of beep. The max value of multi-meters is 6.7...
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    My boat run slowly. 120HP,2.5L,1989

    I replaced the gasket of distributor which led to the timing off. Later I set the timing by myself according to following viedo. I am not sure if it is correct or not.
  15. L

    minn kota trolling motor part

    I have two Minn Kota trolling motor and the model is Maxxum. But I cannot identify the serial No and also I do not know what year they are First one is the steering cable is broken. Second one has broken parts and I do not know what part it is. I'd like to know what part I should buy for...
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    My boat run slowly. 120HP,2.5L,1989

    I have replaced the spark plug and motor runs more smoothy. Thank you everyone.
  17. L

    My boat run slowly. 120HP,2.5L,1989

    Are they ok?
  18. L

    My boat run slowly. 120HP,2.5L,1989

    Ok. I will replace the spark plug tomorrow and run it again
  19. L

    My boat run slowly. 120HP,2.5L,1989

    Do you mean there are some mud in the head of spark plug?
  20. L

    My boat run slowly. 120HP,2.5L,1989

    Should I replace all the spark plugs?
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