sizing 25" transom for San Leandro jet

[Skunkdog]

Hey guys, first time poster, here. My 115 '96 Jet Johnson lost compression and it's time to repower. I am going to get a 150hp with jet (San Leandro, most likely), but am twisted in knots about the shaft length to get. My transom is 25", however, my old motor is 20" from the bottom of the engine bracket to where I estimate the top of the cavitation plate would be IF I had a lower unit.

I don't intend to do any welding mods, just a direct replacement.

Thanks for any help,

Skunkdog

 

[Julian]

Does the new engine have any guidance on ideal depth below the running surface?

 

[Skunkdog]

I found the answer. When installing a San Leandro jet (outboard) to any motor, it adds about 5-6" to shaft length. Thus, my 25" transom is designed for a 20" shaft motor when using a SL pump. I could run a 25" shaft, but would have to add a 5" jackplate or weld the transom higher.

This looks like more of an inboard lake jet forum, I'm tooling around in shallow rivers out west.