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SEI is Sterndrive Engineering. They make replacement parts and gearcases for popular motors.

Are the splines holding the prop in that spot? I had to drill out some of the splines on my Merc prop to make it fit the Johnnyrude.

Clearly that is not correct. I have used Merc props on my Johnnyrude, and vise versa, so if the hub is the correct size and the driveshaft diameter and splines are the same, it will work. It doesn't look like your propshaft size is correct, however. I had to grind down the inside of a thrust...

Look up a hydraulic steering system and see the cylinder it has at the motor. Do you have something like that? Calbe steering doesn't have a cylinder at the motor.

Generally, yes, a prop shop can do that. They will also usually stamp the prop with the new pitch.

I would recommend a service manual, as the replacement procedure is tricky. Mark or remember the position of the hose clamps on the bellows, as you will want to put them back the same way. Use the bellows adhesive. A blunt tire iron is good for pushing the bellows onto it's seat.

You might U/L a picture of the control. Sometimes the throttle handle has to come off. Others the throttle only button. However, it is hard to tell w/o photo.

Great, how exactly do you get the tranny fluid out of the crankcase? That is where it will end up, while soaking the pistons.

So you are talking about a Johnnyrude thru the hub exhaust-style prop? The thrust washer keeps the prop from hitting the gearcase. The hub of the prop usually fits into the hub of the gearcase, with a tolerance of 1/8" of so. Is that what you are asking?

Gee, 2 cycle engines hate any metallic additives in their oils. That is why non-detergent motor oil is used as 2 cycle oil. I always thought that ATF had lots of metallic components as part of their additive package, especially the new stuff. Chain saws are one thing, but multicylinder high...

Gee, doesn't anyone remember the "spackle" paint GM used in their trunks? It was likely all the exterior paint they had left over, mixed together.

Scott, In the olden days, did anyone mix tranny fluid with gas for 2 cycle outboards? I expect the additive package would be bad for them. Tranny fluid damaged the paint on my '69 Marquis. 2 cycle oil would never do that.

It has a happy ending. After the repair the boat hull was good as new, and I used it for 3 more years before trading up. To complete the story, that boat seemed to have the "made on Friday" syndrome. Some parts of the boat were real good quality, and other parts were real low quality. i.e...

Yeah, I don't recommend that either, although there is usually a fair amount of residual 2 cycle oil from the engine flooding, to lubricate the ether.

Mike, it cracked all the way thru the hull and water was bubbling up thru the ski well floor. I had to pull her in a hurry so it would not sink. To repair it, I laid heavy roving on the inside of the cracked area, added a new PT 2X4 stringer at a 45* angle across the formerly cracked area...

Wow, you have a rigging tube? I use electrical tape to tape the electrical, fuel, cables and water tubes together to make the splashwell neat.

I am not sure I want to put transmission fluid in a 2 cycle motor. It will get into the crankcase and then be burned when you start it up. You will never be able to drain it all out, after use. Marvel Mystery oil, Seafoam and Ring free are designed to be burned in a 2 cycle motors. I would...

Any cracks at the top transom corners? If you stand on the motor's anti-ventilation plate does the transom flex? Does any part of the hull flex? If no, you can take it out, with a friend who can swim, and see how she behaves in light chop. If you see the hull flex as you move along, you...

or more likely dropped oil and grease.

In the particular case of stuck rings in a 2 cycle engine, I would expect the cause to be lack of use over long periods or water infiltration rusting the rings. The latter is not normal, and the former is unthinkable (smile).