Can somebody please give me their expert advise with this situation? I broke a plug while doing a tune-up. I had to pull-out the entire head to get the stuck plug out. After everythings put back inplace, did a run on the water but the craft wouldn't go beyond 53mph but you can hear the power of the engine but no go! What seems to be the problem?

Did you over-tighten the spark-plug?

Please let us know so we don't repeat the mistake.

Thanks!

yup made a mistake over-tightening the plugs.