modify 20" Yamaha to 25"

[DCG]

Has anyone seen or heard of changing a 20 inch to a 25 inch shaft, I have a 2001 Yamaha vmax 150 which has only 600 hours and runs like a top but my rebuild of 79 222 with Armstrong bracket needs a 25 inch shaft motor when I started I wanted to use the motor I have but Armstrong Technical doesn't recommend it with 20 inch shaft. I don't want another used motor so if I can't modify this one I will have to buy new. so far 2 Mechs have said can't do.

[gran398]

Your mechanics may not be aware of this quality product. It can be converted back to 20 inch at any time.

viewtopic.php?f=12&t=10985

Give them a call. Their model #801 should fit your Yammie.

If you or your marine-related business has a Fed tax ID #...you can purchase at wholesale.

Mercury's with Bay Mfg. lower unit extensions:

[gran398]

Bay Mfg. extension studs



The 5" cast aluminum housing slides up.

[fitz73222]

Has anyone seen or heard of changing a 20 inch to a 25 inch shaft, I have a 2001 Yamaha vmax 150 which has only 600 hours and runs like a top but my rebuild of 79 222 with Armstrong bracket needs a 25 inch shaft motor when I started I wanted to use the motor I have but Armstrong Technical doesn't recommend it with 20 inch shaft. I don't want another used motor so if I can't modify this one I will have to buy new. so far 2 Mechs have said can't do.

I'll give you a little more detail into the install of the extension kits. The cast aluminum extension housings are bare castings and need "clean up" I had to radius all of the edges so we could get good paint adhesion and lots of sanding and prep prior to painting them but really not a big deal just needs to be done. The assembly instructions from Bay look like a 4th grader drew them up so prepare for not much help from them. When I researched these prior to installing them, some engine models may require modification to the exhaust adapter under the powerhead in order to clear the driveshaft extension coupler. Those Mercs shown didn't need to be modified but just be prepared that you might have to remove the powerhead and make the mods. The shift shaft adapter was a pita to figure out and I almost thought we had the wrong ones but finally figured it out after a night sleep. You would think it was simple but without decent instructions you have to figure it out on your own. All in all the install went OK and parts were of good quality and everything worked fine after we cleared all of the hurtles. I will be glad to lend you any advice about the install I learned if you decide to go this route. Definitely better then finding another engine.