Yamaha 60DES S750 UIM Speed Record 1986

[hydrospeed77]

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 homologated in via supplemental homologation.

update:
Original 60D came with "675" gears. This is 1.71:1, and as a side note the 70CES parts book also lists "675" gears. I also have a document that states the 60D came with 1.85 gears. So perhaps there is an error in that doc, or later model years came with 1.85 from the factory. The "679" gears from the 2cyl 40F also fit and were used officially for racing back in the early 80's in the UK.

[hydrospeed77]

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.

[hydrospeed77]

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