Launched today boat ran fine for the first 5 mins then it started to expiriance bad vibration.... slowed down the engine temp and pressure was fine but had a rough idle... pressed the gas and felt like it was restricted would Rev and randomly stop... took the boat out and checked pump had nothing stuck in there so I'm stumbled... may I add a I noticed a whistle at high rpms before it started running like shit! Suggestions  anyone?

Bad thrust bearing on the pump?


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I just started it in the driveway which it does just fine and it's shaky and struggles when I Rev it

Disconnect the drive line and see if the problem goes away. That will tell you if it's engine or the pump.

Bingo! Was just about to type that! Like your boat to mine, you were faster.

Disconnect the drive line and see if the problem goes away. That will tell you if it's engine or the pump.

sounds like an idea... of course that requires  pulling the engine right?

sounds like an idea... of course that requires  pulling the engine right?

Most likely no. You should be able to just unbolt this guy.


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Launched today boat ran fine for the first 5 mins then it started to expiriance bad vibration.... slowed down the engine temp and pressure was fine but had a rough idle... pressed the gas and felt like it was restricted would Rev and randomly stop... took the boat out and checked pump had nothing stuck in there so I'm stumbled... may I add a I noticed a whistle at high rpms before it started running like shit! Suggestions  anyone?

this is my set up. Just unbolting the u joints  and it should slide back enough to run your engine. Hope it's something simple good luck

Check all the spark plugs if it's running on less then 8 it can shake and if one isn't firing it starts to flood out the other plugs and if that's what it is it's cheap and easy fix good luck jesse


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Pull the distributor cap and grab the rotor and see if it spins. Sounds like a mis fire to me.


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I pulled the cap off today it didn't look in best shape but I never checked if it turned. Ordered a new rotor cap and wires hopefully thats my issue. Should it turn pretty easily?

So I found a cut on the red distributor wire going to the coil. Spliced it and motor turned on fine reved fine but had a hiccup when pressing gas... could this have caused my problem?

If anything got wet, yep. Otherwise maybe not.

Please post a video of it running and we maybe more help


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So went out today everything seemed fine up until of course 5 mins into launching it started to miss fire and bog really bad no type of power. If I give it no gas it dies... by the time I got to launch ramp I started it up to video the symptoms and of course nothing wrong it started fine and rev good. I then just pulled it out... suggestion right now in the driveway it starts and sounds fine so it's hard to trouble shoot suggestions?

I didnt go back and read thru the whole thread. How old is that coil? Could be a possibility of the coil getting hot and breaking down. Once you let it sit, it cools down and runs fine for a few?

. I also thought the same thing but you say it run at home fine for a while.


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