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Some more history related to this motor, and two racers I wish I was able to speak to.

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This is the boat, motor, and driver that set the record shown in the first post in this thread:

https://www.youtube.com/watch?v=hFUgbrZRakE

Amazing that this video exists.

Some more history regarding the 60D (6F1):
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) officially...

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...

Very similar, yes. not Exactly the same. Likely more differences between the 60D/60DE (6F1) and the regular 48/55/60 2Cyl than the differences between the 70CES (6J2) and the regular 70hp (6H3).
...

1981
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found this in an old Yamaha publication.

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