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Thread: Looking for information on Yamaha model 62F..50 HP

  1. #1
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    Question Looking for information on Yamaha model 62F..50 HP

    I won this power head [long block] in a British auction. It is 50 hp, 3 cylinders ,but, it is not 43 cubic inches like the normal 40 and 50 horsepower Yamahas we see over here. It has a serial number 100189 on the block. It looks a lot like a 70 6H3 or 6H1 block. The papers I got with it say it had a 14:24 gear case, a 11 3/8 x 12 pitch prop, 4500 to 5500 rpm operating range and a compression of 6.30. The documents look totally Yamaha. I am at a loss with the 62F code. It doesn't match the normal Yamaha outboard codes. They go "number”,” letter", "number" [example 6H3] This motor is 62F! Anyone know what I have here?
    thanks
    Don

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    So far I have found out the motor is a 1993 model 50 hp. Called a 50G. It came in two versions. A short shaft and a long shaft. I would appreciate seeing a picture of one. The model was not sold in North America. I think it must have a lower unit same as the 2 cylinder 55 hp motor.

  3. #3
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    Yes, in Europe the 850cc block was used on the 50G (62F), 60F(6H2) & 70B(6H3).
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    Argo Cat 18
    Merc 2.4EFI/CLE

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    Thanks French Phil, I have a parts book coming from Britain, so I will able to check. I did get an email as well. The sender says serial number I have is from a short shaft model ?

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    Both short & long were available. What boat will you pair with the 50 ?
    Argo Cat 18
    Merc 2.4EFI/CLE

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    French Phil, I may have really lucked out with this power head. We race T Class in this area. Our rules are a little different which gives me an interesting option. We normally race
    a 70 CES yamaha on a Critchfield in T850 class. To help the T750 class grow , we planned to run a 50D Tohatsu on a different boat. Now if this 50G Yamaha power head fits on the 70 CES mid, then I only need to change the powerhead on the T850 boat. Our Fair Competition Rule will allow this 50 hp in the T750 class eventhough it is a larger cubic inch. The T850 boat is over 150 lbs heavier than a normal T750, so it may not be competitive. But it is worth a try. Plus it gives us an additional boat a new T750 racer can try. Plan B would be to sell the motor to a Thunder Cat racer up here.

  7. #7
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    Definitely a good find. Here's a link to the tech manual:

    http://www.box.net/shared/24jtr2ycxe

    It's in French but as a Canuck you should do Ok.
    Argo Cat 18
    Merc 2.4EFI/CLE

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    Thanks Phil, French isn't one of my stronger suits, this will be a good reference.
    Don

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    Hi Hounddog
    where did the FBC thread on the v bottoms/ T boats go?
    Thanks

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    Quote Originally Posted by Powerabout View Post
    Hi Hounddop
    where did the FBC thread on the v bottoms/ T boats go?
    Thanks
    Good question!! I don't know! I know their working on the site, maybe it is temporary.

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