You are watching: Short shaft outboard on 20 inch transom
Can I use a Short-Shaft motor on a 20" Transom?
I have a Mariner 25 HP short-shaft motor and would like to buy a boat to put it on. The boat I would like has a 20" transom and I"ve been told that it needs a long-shaft motor. Will my short-shaft work on it? If not, is it feasable to change the motor to a long-shaft at a reasonable cost?
The key measure is if the anticavitation plate (horizontal plate on shaft above prop) is at or below the bottom of your transom. If above, you won"t be getting clean water flow to the prop which means the shaft is too short. Put the motor on the prospective new boat to be sure.If too short you will probably be better off selling that motor and buying a new one with a longer shaft. That will be cheaper than buying and installing a new lower unti with longer shaft.DS
If the transom is not approx 15" then that motor won"t work... don"t even try.There are aftermarket "kits" to extend the shaft length but often times the best way to go is to sell the motor and buy another (like drift sock suggested) The aftermarket kits are not cheap and I believe they reduce the worth of the motor you convert and you might not be happy when you go to sell it.Good fishing!
I had the same problem come up last week and I can tell you it will not work! You won"t get past half throttle! I found the extension kit from Bay Manufacturing (they make aftermarket and OEM parts for Merc) and the total cost was going to be close to $500 by the time it was all said and done. I decided to sell the Merc and buy that Yamaha 4 stroke I"ve always been wanting :) Here in Georgia, the short shaft motors sell very higher anyway. And boy you should see that Yamaha run......
It won"t work well at all on your Lund.It will push you forward, at low speeds, but in reverse, it is as effective as an egg beater.
I have a Yamaha 15"(short) shaft F8 on my ProV(20" transom). All I use it for is forward trolling. It works great, have never had any problems at any speed. Backtrolling, on the other hand, probably would not work. Especially in rough water.wiggle
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