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  1. I agree that the minimum T-750 weight is to...

    I agree that the minimum T-750 weight is to light. Most boats weigh 250-260 lbs. or more. ( The Rossiter Critch is 225 lbs. w/o the 16 lb. cowl.) The rigging weighs 75-80 lbs. I know since, I just...
  2. 4-Strokes for racing

    Aside from using a laptop to modify fuel delivery & timing curves on 4-strokes, mechanical mods would be required. The motors with removable heads can increase compression by milling head surface....
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    :) If the carbs also have intermediate air...

    :)

    If the carbs also have intermediate air bleeds, you will start with .065's for hi-speeds, and 2 1/2-2 3/4 turns on the idle screw. Without the intermediate air bleeds, I would stay with .073's,...
  4. 75 HP Stinger

    Did you check the reeds as suggested earlier? That will definitely cause poor idle and mist coming out the intake of the carb. The backfire is caused by a lean condition, which the reeds can create...
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    Also, the reeds can't give too much air. The air...

    Also, the reeds can't give too much air. The air is controlled by the carb size. The improved reed flow merely allows what the carb has to offer to enter engine better. The fuel/air ratio is set by...
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    OMC Orifice Plugs

    :)

    Sounds like your too rich on the IS air jets. Try going to a larger IS to lean down mixture. The 71D's on HS are way too much. If I had to guess, I'd go 55-56 HS and 50-54's IS. How is throttle...
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    The larger the air jet, the leaner the mixture....

    The larger the air jet, the leaner the mixture. You are adding more air to the same fuel delivery.
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    Orifice Plugs

    :) Hi Fred, Yes, I know the "C" & "D" has to do with flow direction, but what is a 1/4"-20 hi speed jet with no letter designation? There are three: Ex: 73D, 73C, & 73. To straight 73 has no counter...
  9. Thread: 55hp johnson

    by oledawg
    Replies
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    3,134

    You will need the 70 hp adapter plate to...

    You will need the 70 hp adapter plate to accommodate the exhaust outlet and tuner requirements of the 49.7 or 56
    .1 cid motors. The splines are different as well. The 49.7 & 56.1 cid early models...
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    OMC Orifice Plugs

    :confused: Can someone explain the difference between a "C" & "D" hi speed jet for OMC motors. There is also a hi speed jet with no letter designation. Those have the jet size running all the way...
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    OMC Orifice Plugs

    :confused: Can someone explain the difference between a hi speed OMC jet labeled "C" vs. "D"? Also there is the same jet with no letter designation. They have the jet size all the way through the...
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    7.69" from the powerhead mating surface to the...

    7.69" from the powerhead mating surface to the end of the tuner.
  13. Thread: Yamaha 60 c

    by oledawg
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    Thanks Paul. See ya' soon.

    Thanks Paul. See ya' soon.
  14. Thread: Yamaha 60 c

    by oledawg
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    You do not want a cleaver prop. Stay with a round...

    You do not want a cleaver prop. Stay with a round ear that will carry the bow weight.

    Hydromotive Engineering
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    Yes, you can use the crank from the 3 cyl. 55hp...

    Yes, you can use the crank from the 3 cyl. 55hp as long as it has the 4 tooth spline. I'm sure it does. Just be sure to run the 1.86:1 ratio.
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    Kevin is right on the mark. The Nitro case is...

    Kevin is right on the mark. The Nitro case is 1.86:1 ratio, so you will not over rev props. There are some 2.42:1 Nitro cases used on the OMC, 2 Cyl. motors around 50-60 HP. You of course, do not...
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    Why don't you just use a Nitro gearcase from a...

    Why don't you just use a Nitro gearcase from a 49.87 cid Stinger 75hp, or an SST-60 gearcase? You will gain 3-5 mph with the smaller diameter case, and the 4 tooth spline and shaft will bolt right up?
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    Thank you Fred. Sounds like the way to go.

    Thank you Fred. Sounds like the way to go.
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    Hi Fred, What do you expect will happen when you...

    Hi Fred, What do you expect will happen when you raise the boost ports to the same height as transfer ports? Will that change the power curve upward? Will it help top end HP, but hurt bottom end?
    ...
  20. Thread: Ziggy Boettle

    by oledawg
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    Sorry to hear of Ziggy's passing. I knew him from...

    Sorry to hear of Ziggy's passing. I knew him from OPC races in the late 80's & early 90's. We were racing SE & SST-60 during that time.

    Thom Bucknell
  21. The SST-60 is a Bridgeport motor with the angled...

    The SST-60 is a Bridgeport motor with the angled upper lip on the exhaust ports. The port timing on the SST-60 is different then the stock 70 hp. The SST-60 also uses 1 1/2" bore carbs without the...
  22. Thread: Omc 56ci

    by oledawg
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    Hi Paul, Could you please forward a copy of...

    Hi Paul,

    Could you please forward a copy of the rules to Todd & I. Send to hec2buck@windstream.net

    :rolleyes:Happy New Year!
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    Prop Diameter

    :)You can easily run the blade tip to within 1/4" of the cavitation plate.We have come even closer than that. This information comes from 30 years of manufacturing and testing propellers.
  24. I think the wing style sides are legal. Just no...

    I think the wing style sides are legal. Just no air entrapment under the hull. The bat boats that run offshore are fast, get over water, and have the wing sided design.
  25. Thank you. That helps a lot.

    Thank you. That helps a lot.
  26. Hi Don, Perhaps the boat weights are lighter...

    Hi Don,

    Perhaps the boat weights are lighter than ours. Also, can they run low pick ups on the gear case? That is 3-5 mph right now! Some of our guys are getting 70-72 mph, and a couple are...
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    Oval Poprt vs. Bridgeport

    :)

    Yes, Kevin is correct. On the 56.1 the bridge is vertical and can be oiled easily. There is only 1 bridge per cylinder port on the 56.1. However, the ports are wider than the 49r's. Your Mod 50...
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    The parts list is for the 1994 56.1 cid, both...

    The parts list is for the 1994 56.1 cid, both 60hp & 70 hp versions. That is probably why the jet selection.
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    OMC committed to the 56.1 bridgeports for racing...

    OMC committed to the 56.1 bridgeports for racing SST-60 before they developed the oval port 56.1. The reason they stayed with it was to avoid ticking off all the racers that already had bridgeport...
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    Hi Fred, Are you saying the most OMC ever got...

    Hi Fred,

    Are you saying the most OMC ever got out of the 56.1 cid oval port is 60 hp? What about the 56.1 oval port fish motor at 70 hp rated by BIA. Also, your saying a 56.1 brideport from OMC...
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    We do oil the bridge.

    We do oil the bridge.
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    But the bridge disturbs the power pulses on the...

    But the bridge disturbs the power pulses on the return to the port? That does not occur in the oval port. Which one makes more power?
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