Join Date: May 2006
Location: Left Coast USA
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Swapping out the inboard is not that complicated. I did myself on my first boat while it was in the water. It was 30 foot wood boat with an Atomic 4. I replaced it with a new Yanmar. I changed almost everything, prop, shaft, exhaust. Reused the tank but it was really too big once I switched to diesel. The 12hp diesel only used 1/6 the fuel.
One key to making the job easier for me was using a Scatra drive which a constant velocity joint. This made it possible to ignore engine alignment. They are expensive but allow you to mount the engine much lower than normal. That might not be an issue for you however.
The most difficult part was sizing the prop correctly. I took my best shot when I ordered it but needed to have it re pitched by 2" after testing. Not a big deal though except for two more trips under the boat in cold water. Ever try to use a three arm puller while holding your breath? Disclamer:I was young and cheap.
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Currently in Long Beach, CA