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Here are some pics from assembling a short shaft from a long shaft. This was a few years ago. I'm adhering to our "Super Stock" racing rules. Basically the powerhead has to be stock, and/or built...

All the 60hp models from around 1980/1981 came with the 1.71 "675" gears. 60A "675" and 60C "6F0" (the two I own, all original) as well as the 60D "6F1".

Racers probably saw that due to the power...

Yes, but only at a later date. It never came with 2:1 gears from the factory. The RYA homologation that includes the 2:1 gears clearly states those gears are from the 40F "679" model, and in fact...

To clarify and correct for historical purposes, the 60D (6F1) came with 1.85 gears from the factory (13:24). I'm guessing some racers lobbied to have the 13:26 gears from the 2cyl 40hp (679)...

I recently re-read this whole thread and want to clarify a few things I've found more recently.

There are claims in this thread the 6F1/60DES tuner was dual horn - it is not - you can find pics...

I had a great person help out and measure a new old stock 6F1 piston, and as per speculation, the 60DES bores were 81.30mm for a displacement closer to 747 or 750cc..
Stroke and rods are the same as...

After asking around and searching for info, I have a feeling that the 6F1 was unique in that the displacement was exactly 750cc - It had slightly smaller bore pistons than the very common 760cc 82mm...

I was not thinking OMC at all. Yamaha 2Cyl 55 / Mariner 60 vs. Yamaha 700cc 50. Of those two, what would run better in T750..?

I'd be interested to see if this 2Cyl outperforms a 3cyl 700cc 50hp. Both in stock form and just with basic mods like larger carbs, clean up the ports, mild exhaust tuner.

Hounddog,
any updates on this project? I'm interested in getting a 1977-1979ish Mariner 60 2cyl running well.