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has anyone mounted a 25" shaft 150 four stroke yamaha on an old 19ft outrage useing a jack plate?
is this a good idea?
it looks like the lower bolt holes on the jake plate will be too low and have to run through the stern compartment.
Should this be done?
will this hold up and perform well?
really need the help from you guys. Thanks.
Looking at this set of photos should help you. I would not mount a 25" engine on the hull, and the lower bolt holes have to go through the plywood reinforced transom, but not the foam insulated fish well. No strength there. Find a 20" engine.
The controlling dimensions will be from the need to get the lower set of holes into the transom. Work up from there. In my installation the top holes were closer to the top than I would have preferred, so I used the transom stress plate. Worked out quite well. Jackplate is a Detwiler, 6" setback and anadozied construction for slat water resistance. One of the best I have found.
Thanks so much for the pics and info.
did you raise your jack plate up just a bit to stay in the wood and did'nt that raise your top bolts closer to the top edge of the transom?
My 19 seral # is 000667 and looks to be just like yours. is yours a 74.
I jumped the gun and already have the engine. I only paid 2 grand and it is like new.
What ever i do with the engine i still need the jack plate for the other reason. Thanks.
My boat is hull #750, a 1975 model year, manufactured late October 1974.
The Detwiler jackplate I used, which cost about $350, comes with two sets of B.I.A. pattern holes pre-drilled on the boat side, separated 1" vertically. Because of the shallower transom depth on these older Whalers, I used the top set of holes for the bottom bolts, and the lower set of holes for the top bolts. This gives an effective vertical separation of 7" instead of the ususal 8". This worked, as you can see. It also has the effect of raising the bracket on the boat about 1-1/4" already, toward you goal of getting the engine up 5".
You might try this same approach. Pick up a Merc Laser II prop to install on that engine, and she will "scream and fly".
