How do you know the SST-45 cowl will fit over the E-Tech 60 hp? Are you talking about the SeaWay cowl or the OMC SST-45 cowl?
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How do you know the SST-45 cowl will fit over the E-Tech 60 hp? Are you talking about the SeaWay cowl or the OMC SST-45 cowl?
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...
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....
:)
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,...
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...
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...
:)
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...
The larger the air jet, the leaner the mixture. You are adding more air to the same fuel delivery.
:) 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...
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...
: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...
: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...
7.69" from the powerhead mating surface to the end of the tuner.
Thanks Paul. See ya' soon.
You do not want a cleaver prop. Stay with a round ear that will carry the bow weight.
Hydromotive Engineering
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.
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...
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?
Thank you Fred. Sounds like the way to go.
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?
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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
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...
:)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.