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Finding Parts for my Mod C speedmaster marine 30 Yamaha
https://hpbc.ca/viewtopic.php?f=20&t=4658		 Page 1 of 1
Author:  Hounddog [ November 14th, 2024, 11:30 am ]
Post subject:  Finding Parts for my Mod C speedmaster marine 30 Yamaha
The hunt for parts can be the fun part of a project and sometimes it’s not fun.
After Ted’s passing his sons found a mod C 6J8 Yamaha long block at their shop. Ted had built the motor in 1992 and never sold it. I purchased it a couple of years ago and tracked down what happened to the rest of the outfit. The boat and motor were sold. The motor was sold with a different powerhead. The motor was later sold separately along with an empty new nose cone gearcase.
The gearcase was made by John Beer at the Prop Shop and never had the inners installed.
I was able to purchase that gearcase.

Ted’s motor doesn’t have the 35 cubic inch sleeves and pistons but it still should produce 45 to 50 hp with the correct selection of replacement parts.

These motors look just like a stock model.
https://www.facebook.com/photo.php?fbid ... n__=R%5D-R
Author:  Hounddog [ November 14th, 2024, 2:29 pm ]
Post subject:  Re: Finding Parts for my Mod C speedmaster marine 30 Yamaha
The 35 cubic inch versions could run 70 hp Yamaha carburetors. The 31 cubic inch models which is the original displacement ran very well with 40 hp tohatsu carburetors. Especially the tohatsu carbs with the fuel pump mounted on the carburetor. Replacing the 30 reed cages with 40 Yamaha cages was necessary.
The SLT group are big fans of this carburetor selection.
https://www.youtube.com/shorts/9c7AWT7CGp8

The hunt for 40 reed cages was easy. The hunt for a good set of tohatsu carbs difficult.
But I now have both.

The gearcase is now assembled and I think I have enough spare 30 hp Yamaha parts to build a short shaft with both manual and electric start.

Once I can get it testing. Then I will see if it can benefit with more changes.

There is a fine line with any mod outboard. Just get a bit to extreme and the performance drops.
The good part with these 30 6J8 Yamahas is the mods improve every aspect of the motor’s performance. Hopefully my motor won’t be a disappointment!
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