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Thread: tohatsu 50 - yamaha 70 carbs?

  1. 02-02-2014 #11
    Fast Fred
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    it's the bar that clips on to the three carbs so the throttle plates move in sync.
    as i remember the only one barrel carb that wont fit on the 40/50 power head are round bowl 90hp carbs (round bowl is deeper, so the 90 round bowls wont stack tight enuff to line up on the 40/50 power head.)

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052
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  2. 02-02-2014 #12
    Roflhat
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    Ah I see. so because the carbs are stacked closer together I'll need to use different links. Will the ones from the tohatsu 50 carbs work? or can I shorten the 70 ones?
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  3. 02-03-2014 #13
    Fast Fred
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    um No, 40/50 hp uses 40/50 link. no matter what factory carbs used.
    the link on the tohatsu is adjustable , the sync and link adjustment is not made there on the link. the link is at a set adjustment and unless messed with, need not be messed with.

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052
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  4. 02-04-2014 #14
    Rabbitdundied
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    In for later.


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  5. 03-02-2014 #15
    Rabbitdundied
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    So what is the purpose of welding the crank? Is it because of high RPMs?


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  6. 03-16-2014 #16
    Roflhat
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    Yeh, the tohatsu cranks aren't as strong as the yamaha 50 ones, so for anything over stock RPM welding the crank is necessary
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  7. 03-16-2014 #17
    Roflhat
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    also, does anyone know where to source jets for yamahas? Trying to find a link or something online
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  8. 03-16-2014 #18
    proprider01us
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    I got mine at boats.net
    Quote Originally Posted by Roflhat View Post
    also, does anyone know where to source jets for yamahas? Trying to find a link or something online
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  9. 03-17-2014 #19
    Roflhat
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    cheers, found this - http://www.boats.net/parts/search/Ya...TOR/parts.html
    how do you order different sizes of jets?
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  10. 03-17-2014 #20
    Fastjeff57
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    You're saying that these built up cranks need to be tack welded so they don't shift?

    Jeff
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