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Thread: Modded Yamaha

  1. #1
    Team Member proprider01us's Avatar
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    Default Modded Yamaha

    40hp Modded Yamaha had it's first "fire in the hole" this morning. Going to time it, break it in then see if it can run with the big dogs.
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    Default Mod Yamaha

    I have one of those too. There are two that run in NBRA. I have one and Dick Falbe has the other. We run expansion chambers on both of ours. They run very well. I tried to run mine on my Hemp DMH and it wasn't enough boat!!!!

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    Sam Cullis Mark75H's Avatar
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    It will be interesting to see how a different motor runs in 850.

    Keep us up to date on how it goes
    Since 1925, about 150 different racing outboards have been made.


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    Default Nice work!

    Quote Originally Posted by proprider01us View Post
    40hp Modded Yamaha had it's first "fire in the hole" this morning. Going to time it, break it in then see if it can run with the big dogs.
    Looks very nice Joe, you've been busy!

    Tim

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    Team Member 1100r's Avatar
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    Default Nice

    That is a nice looking motor!! Already looks fast. Keep us posted on how it runs would like to know the results
    Todd

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    Team Member proprider01us's Avatar
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    Default Thanks!

    Thanks guys, hope to get some testing in at the end of May. If all goes well, plan is to start racing it in June. I will keep you posted with results and videos.
    Joe

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    Team Member proprider01us's Avatar
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    Default 40hp Yamaha

    The modded 40hp Yamaha has been on the back burner for a few months. I had the head/water jacket machined to fit the cylinder head temp. gauge. Have the carbs jetted @ #130 and the timing set @ 28 degree. Plan to test it in a couple of weeks at the boat races.

    Anyone have an ideal head temperature I should be aiming for? I hope to get an exhaust temp. reading eventually when I get the proper probe. Can't wait to see what this little looper will do on my gps!

    Joe 2-H

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    Nice. What kinda carbs are those?

    Can u tell me something more about the timing? how to you measure and adjust it?

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    Team Member proprider01us's Avatar
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    Default Carbs & timing

    The carbs are from a Yamaha 50hp. The timing is fixed, while in operation. Since I primarily run @ W.O.T., I set the timing up for maximum setting. I adjust it, when I need to, with a timing light.

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    Thats funny, My 50 carbs look way different (bigger)

    I was wondering on how to adjust the timing. I am giving my 40hp some mods too and i want to advance timing but i have no idea how.
    Could u give a short explenation? it would really help me out.

    Again, your mower looks awesome

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