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Thread: Tohatsu M40D Build 40 50

  1. #11
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    Installed some socket caps on the exhaust cover

  2. #12
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    Here's one of my yamaha 60 carbs with the chokes removed. They are a good bit larger in diameter than the stock 40 intake. I wanted to use 70 yamaha round bowls, but couldn't find any at a decent price.

    I've got to open up the intake to match the carbs. Waiting on a gasket so I can scribe a line.

    Does anyone know what the size difference is between the yamaha 60's and 70s?

  3. #13
    Team Member Roflhat's Avatar
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    I think they're the same diameter, just different jetting. The jets in the 60 carbs might even suit you better
    Thanks camohunter thanked for this post

  4. #14
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    Quote Originally Posted by Roflhat View Post
    I think they're the same diameter, just different jetting. The jets in the 60 carbs might even suit you better
    I think you are right. From my research I found that the Yamaha 60 and 70 intake manifold and gasket is the same part number. That would seem to indicate that the carburetor throats are the same diameter. 70 carbs come with 145 mains. 60 carbs come with 140 main jets

  5. #15
    Xpress2830 Xpress2830's Avatar
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    Default OMC 50 Twin mods

    Hi mr Jerry. Bobby here from Louisiana. Looking for some educated advice for a 95 OMC 50 Twin. Thanks.

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    Default Port work

    Did you do your own port work if so how much did take out

  7. #17
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    Quote Originally Posted by Mchandler View Post
    Did you do your own port work if so how much did take out
    I did not do the port work. Pete Nydahl in Wisconsin did most of the work on the block. I highly recommend his work. The ports were widened a good bit.

  8. #18
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    Default Bored the intake to match carbs

    This was done with a rotary file and a die grinder. I sanded and polished the surfaces after these were taken.

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  9. #19
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    Kinda hit the carb bore a bit with the old grinder, eh? Too bad, but it shouldn't bother a thing.

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington

  10. #20
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    Got my reeds in today. Boyesen Power Reeds. They don’t look like what I expected. They were my second choice after Chris Carson reeds. Chris would never return my call or text after the first time I spoke with him. A friend of mine tried to buy some after me and Chris wasted his time also . I guess Chris Carson has better things to do than sell people stuff. Name:  569A75FB-FBC3-4184-8C12-2C0A6FAD6D58.jpg
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