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Thread: Building a Super Mod 2 cylinder Mariner/Yamaha

  1. #41
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    Just to go off topic for a post. T750 class here is more of a drivers class and a weight class than it is a horsepower class. Racers can buy a used 750 motor here for under $1000. They can get a prop from Ron for $300. To $350. Put that on a T boat and it will run 50 to 55 mph depending on weight. The KEY to racing a T750 is never lifting off the throttle! It is a drivers class! WEiGHT! The closer you are to the 594 lb. minimum, the quicker you are. Our top T750 boats are running 60 to 62 mph on the course. As good as they are add 25 lbs in driver weight and the speed drops almost 2 mph.

  2. #42
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    https://www.facebook.com/kristoffer....type=2&theater

    Norwegian built S-850 old UIM formula4, boat and engine built in Norway

  3. #43
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    What's a typical T750 motor?

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington
    Thanks Maasters thanked for this post

  4. #44
    Team Member Maasters's Avatar
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    I have a 1980 60E shortshaft 150psi in both cyl. HearAttachment 61709Attachment 61710

  5. #45
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    HI all

    I have a 55BE which still has the shocks on the outside of the mount. I'm looking for info to possibly upgrade this to power trim.
    Here in South Africa the spares for these are very limited and I'm battling to find info here.
    Can this be done? how feasible is it and what do I need? Neck, mount and the trim unit?

    Thanks
    Gerhard

  6. #46
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    i think a Yama pro50 t&t bracket will fit that

    Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052

  7. #47
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    Quote Originally Posted by Fast Fred View Post
    i think a Yama pro50 t&t bracket will fit that
    You have some options:
    - the old style twin ram Mercury fits
    - as Fred mention.. the Pro 50 can be modified to fit You switch the lower yoke on the steering arm and make the two top bolt hole a bit larger
    One problem with these old outboards is taking them apart without breaking parts and it takes more time than you think.
    So the best option maybe to get an aftermarket add on trim system like a CMC.

    If by chance this is a long shaft model..any 70 hp Yamaha long shaft model power trim bolts right on.

  8. #48
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    Quote Originally Posted by Hounddog View Post
    You have some options:
    - the old style twin ram Mercury fits
    - as Fred mention.. the Pro 50 can be modified to fit You switch the lower yoke on the steering arm and make the two top bolt hole a bit larger
    One problem with these old outboards is taking them apart without breaking parts and it takes more time than you think.
    So the best option maybe to get an aftermarket add on trim system like a CMC.

    If by chance this is a long shaft model..any 70 hp Yamaha long shaft model power trim bolts right on.
    Thanks Guys

    Yes this is the long shaft version, so I'm now keen on the 70hp suggestion - not sure where it will fit in as this bracket seems quite full or are the 70's also on the outside? sorry for all the questions, I just have to weigh my options here and getting info is key....

    thanks again

  9. #49
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    You replace the complete clamp bracket assembly. The 55 hp mid is almost exactly the same as the 90 Yamaha. So you can use 70, 90 or late model 55 Yamaha. The problem is taking the old parts off your motor.

  10. #50
    Team Member Maasters's Avatar
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    Hounddog I have 2 complete mariner 60hp longshafts. One is a 675 and one is a 6F0

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