Help...50hp 4stroke 2003

[Cup420]

Had a little stutter at WOT and found a loose plug. Changed the plugs and made sure all were tight. Now motor is bogging down, struggling to get from 4500 to 5000 rpm's. Acts like it WANTS to go but takes a good minute or two of surging to get to 5000 and full speed. It was running fine except for the stutter.The last time I took it out.

Just did a compression test and the numbers are not good 1...90, 2...90, 3...60, 4...60. I feel like I did something wrong because there's no way the boat would even run with these numbers. And it ran yesterday.

 

[boscoe99]

When doing the compression test, was the motor fully warmed up, throttle wide open, battery fully charged and the gauge known to be accurate?

 

[Cup420]

When doing the compression test, was the motor fully warmed up, throttle wide open, battery fully charged and the gauge known to be accurate?

No on all but the battery. I'll do that and try again.Thank you. I have a pretty decent gauge.