Re: 15hp long versus short shaft. I would consider one of the following, 1: either get or change your engine to a short shaft. 2: rebuild the transom to fit a long shaft. You cant “shim” a long shaft to fit a short transom. As for some of the speed issue, you just plain have to much leg in the water that is causing excess drag.. If you are measuring for a lower unit replacement and your original lower unit is off of the engine, simply measure from the top of the waterpump to the top of your driveshaft. A shaft length that falls closest to 15 inches is short, closest to 20 inches is long, and so on. If your engine is mounted on a boat or a stand, locate the transom.
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The transom is the back of the boat where the motor is hung. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. If it measures 15″ or with in a inch of that you will need a short shaft outboard. If it measures anywhere from 17″ to around 22″, then your going to want to go with a long.. Long Shaft Vs Short Shaft Outboard Motors.This is a comparison between long shaft and short shaft Outboard motors..