Hello everyone,
I'm at my wits end and I'm hoping someone on here can help me with my problem.
I have a 1990 Lund Baron with a 4.3 mercruiser on it. The boat ran fine for me all summer until last my trip out 2 weeks ago. While out fishing I was not able to get the motor to run over 2200 rpms. If I gave it more gas it would sputter and then ultimately stall out. I was able to keep it under 2200 and get back into the dock. After that day I replaced a rusted distributor cap and rotor and cleaned up the shaft on the distributor. I took the boat out to try it and now I was able to give it full throttle without the boat stalling out, however it only would run about 1200 rpms and seemed to be running rough.
After that I realized that I was almost completely out of gas so I put 16 gallons of gas in it and a can of seafoam thinking that was the issue, I tried it again and same thing 1200 rpms would give it full throttle and it wouldn't shut off just ran rough.
So I took the boat to a buddy of mine who was helping me and we replaced the spark plugs which were definitely well past there life. Took boat out and same thing 1200 rpms. He did a compression test and everything was good there 140 pounds in all 6 cylinders. He disconnected the out drive and started the boat and it still ran rough. We pulled the carburator off disassembled and cleaned it and it still is running rough. I put another 30 gallons of gas and 2 more cans of seafoam and a can of dry gas in it.
The motor also seems to have a pretty good shake to it when running it in neutral. It will run full rpm range in neutral but does have a shake. When the out drive was pulled off my buddy inspected the exhaust and everything appears to be in order with no broken flappers or anything. Also there is no fuel filter anywhere other than the small inline filter going into the carb, that I pulled out and cleaned but it wasn't very dirty at all to begin with.
Does anyone have any idea what the issue could be before I put this boat in the bottom of the river lol.
I'm at my wits end and I'm hoping someone on here can help me with my problem.
I have a 1990 Lund Baron with a 4.3 mercruiser on it. The boat ran fine for me all summer until last my trip out 2 weeks ago. While out fishing I was not able to get the motor to run over 2200 rpms. If I gave it more gas it would sputter and then ultimately stall out. I was able to keep it under 2200 and get back into the dock. After that day I replaced a rusted distributor cap and rotor and cleaned up the shaft on the distributor. I took the boat out to try it and now I was able to give it full throttle without the boat stalling out, however it only would run about 1200 rpms and seemed to be running rough.
After that I realized that I was almost completely out of gas so I put 16 gallons of gas in it and a can of seafoam thinking that was the issue, I tried it again and same thing 1200 rpms would give it full throttle and it wouldn't shut off just ran rough.
So I took the boat to a buddy of mine who was helping me and we replaced the spark plugs which were definitely well past there life. Took boat out and same thing 1200 rpms. He did a compression test and everything was good there 140 pounds in all 6 cylinders. He disconnected the out drive and started the boat and it still ran rough. We pulled the carburator off disassembled and cleaned it and it still is running rough. I put another 30 gallons of gas and 2 more cans of seafoam and a can of dry gas in it.
The motor also seems to have a pretty good shake to it when running it in neutral. It will run full rpm range in neutral but does have a shake. When the out drive was pulled off my buddy inspected the exhaust and everything appears to be in order with no broken flappers or anything. Also there is no fuel filter anywhere other than the small inline filter going into the carb, that I pulled out and cleaned but it wasn't very dirty at all to begin with.
Does anyone have any idea what the issue could be before I put this boat in the bottom of the river lol.
