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Thread: yamaha 70 ces

  1. #21
    Team Member Roflhat's Avatar
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    Quote Originally Posted by Fast Fred View Post
    just a 70hp gasket set, on the rings, the stock ces pistons run a thin ring high up close to the crown, never could order them rings. on the ces head, with a nose cone on a tunnel inflatable it will push the water plugs out of the head, i would take the extra washer off the head bolts, make a cover plate for the head (same thickness as the washers), that keeps the plugs in.
    Cheers Fred,
    yeh ordered a gasket set today, tried to get the rings but they are discontinued with no equivelent. Have you tried Wiseco pistons in it?
    I was thinking about getting a LWP nose cone. I'm getting a billet cylinder head made by TSR, will i still have to make a cover plate?

  2. #22
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    ya always used wiseco's, in every thing. would have to see the head. carefull not to bottom out the head bolts and or to short is also a problem i've seen, eather one strips the case, torque on the head is like 18lbs i'm thinkin.

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

  3. #23
    Team Member Roflhat's Avatar
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    Cool thanks.
    Here's a couple photos of the head -


    It comes with new bolts too, custom stainless ones.

  4. #24
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    stainless is weak, grade 2, the stock ones are chrome plated steel, grade 5. the stainless bolts will react with the alu' and weld them self's together, = snap. nice lookin head, should be good to go, if the squish is pos', then you can lean on the main jet size.

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

  5. #25
    Team Member Roflhat's Avatar
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    Quote Originally Posted by Fast Fred View Post
    stainless is weak, grade 2, the stock ones are chrome plated steel, grade 5. the stainless bolts will react with the alu' and weld them self's together, = snap. nice lookin head, should be good to go, if the squish is pos', then you can lean on the main jet size.
    Ok, I may just run the stock ones then thanks. Yeh it's got positive squish, on the tohatsu 50 there was around 1000 rpm gain.
    I'll try the 160 jets in the 90 carbs first and see how it goes from there. Have you got any photos of your throttle cam for the 90 carbs on the 70?

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    cool man

  7. #27
    Team Member Roflhat's Avatar
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    Do you get any smaller gearcases for the 70ces? Was looking at bass or SST lower units, the 70 one seems fairly chunky

  8. #28
    Team Member Roflhat's Avatar
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    Anyone have experience testing different CC head chambers on the ces?

  9. #29
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    yes, what are you lookin to do?

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

  10. #30
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    Quote Originally Posted by Fast Fred View Post
    yes, what are you lookin to do?
    Hey Fred,

    after all round power, engine is ported with 90hp carbs. The TSR head ive got has removable chambers so I could draw up some new ones and have them CNC'd
    I've heard 34cc is decent, TSR tells me the ones I've got are 37cc but it's only at ~135psi with that head
    Likes fs5 liked this post

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