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  1. E

    half power at start up

    Looks like that I need to replace the spark plug. Now, I got a new problem. I can not find the model number and the serial number. I found a tag. But it was totally worn out. Can not tell anything about it. I did some research. And found a number on a "seal plug". It is G4188991. Any idea what...
  2. E

    half power at start up

    Hi, I just bought an used 9.9hp. It runs good. The only thing is that the motor only output half of the power when it is first started. It can reach the full power about 10 minutes later. The boat is only at about 6.5 miles at start up, then it can reach about 11 miles about 10 minutes later...
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