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    OMC 5.7. Totally frustrated

    carburetor does appear to be original. 4 barrel I’m going to check float setting today and clean needle valve. Points are from Sierra marine.
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    OMC 5.7. Totally frustrated

    Did not set dwell, 0.018 on points. Did not mess with distributor. So did not reset set timing. Additional question I have is 5.4 volts enough for coil to operate properly when points are closed, everything I read says 7 to 9 volts. Not sure it makes a difference however. 12+ volts when open.
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    OMC 5.7. Totally frustrated

    Problem of no spark happened before ignition parts. Replaced parts and boat idled fine and ran fine on muffs. Started boat on muffs for 3 or 4 days playing with idle speed and linkage, idle was high, then it just stoped. linkage was sticking after giving it gas. Points were from eBay, can’t...
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    OMC 5.7. Totally frustrated

    1992 holly carb , points, Starts, idles for 5 secs, shuts down. New plugs, points, condenser, cap and rotor. Not wires. Machanical fuel pump, pumping plenty of gas. If I give it 1/3 throttle it screams a bit longer but then shuts down. Took carb off, cleaned front jets and idle ports out...
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    Omc 5.7 cobra. 1992 sunbird.

    Ok so I thought about that. Two wires going to + side of coil. i am assuming, one from key other is resistance wire ( red- purple in my case) that I understand goes to alternator. Checking for continuity I found wire going to alternator. Removed from alternator, no change still 5+ volts when...
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    Omc 5.7 cobra. 1992 sunbird.

    Finally got back to boat. Bought new points, condensor, rotor and cap and coil. But I noticed the following, I have 12+ volts going to coil when wires are not attached to coil, but if I attached wires to coil it drops to 5+ volts. This happens on my old coil as well as a brand new one. Any...
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    Omc 5.7 cobra. 1992 sunbird.

    No spark. Coil resistance checks out on both primary and secondary coils. 12 volts to distributor, test light blinks when connecting to + line at distributor and - at distributor and engine is cranked. Bench tested coil for spark with old and a brand new coil with condenser attached to set...
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    OMC Chevy 5.7 just cuts out.

    Thank you for your input. The shifter has given us some issues at times with getting it to turn over. Come spring thats the first thing going I’m to take a look at. Hopefully I’ll be able to replace or fix that micro switch. Given how suddenly the engine dies and then suddenly starts again...
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    OMC Chevy 5.7 just cuts out.

    It definitely could be 1991 not 92. Definitely has points. I cleaned them a bit last summer but needs replacement. Don’t want to change over to electronic.
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    Any Sunbird owners still around?

    My son purchased a 1992 205 Corsair open bow with a 5.7 Omc Chevy in it. King cobra cone clutch outdrive. Nice looking. Rebuilt carb, new plugs. Hit 61.3 mph on gps. He loves it , has a few issues but nothing mayor.
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    OMC Chevy 5.7 just cuts out.

    That’s what I remember it looks likes but then again, what’s my other possibility? I think this motor had two different distributors used in them. Seems like all points and condensers look like that. Thanks For your effort.
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    OMC Chevy 5.7 just cuts out.

    Boat is put away for winter, will need to wait until spring. Thanks for your interest.
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    Evinrude or Johnson ??

    messed that up. Going to try and get her started in the spring and check it out completely before I do anything with it. Just a fun project until I found another one. Always messing with something.
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    Evinrude or Johnson ??

    So much for that thought. Who knows doesn’t really matter ,going to get to
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    Evinrude or Johnson ??

    Ok so here is my logic ( means nothing). So bore is the same for 115 and 135, 20 hp needs to come from somewhere but nor displacement. Either fuel jets, air intake or exhaust ports, the info I have found is that the cylinder heads have different numbers. I believe that they contain both...
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    OMC Chevy 5.7 just cuts out.

    Thanks for your responses. It does have points and condenser which we are planning on replacing. But Im hoping the issue is just a loose wire somewhere in the ignition system. Like I said it just doesn’t happen if below say 6 miles per hour in calm water. We did have issues with the throttle...
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    Evinrude or Johnson ??

    Did some more looking. Removed coil plate and found circle where #s should be I think. Port side looks like soft plug. No #s!! Not surprised. Did however find part # on starboard side cylinder head. (319943). Looked that up and found fits 1970s 135 Johnson. Then checked out model # for...
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    Evinrude or Johnson ??

    That’s really interesting. I now understand the system. I thought maybe cooling separate sides, but that made no sense when I looked at pump itself. When I started the engine the first time I had the lower unit off and put water to both tubes, little pressure but some. Engine ran fine and...
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    Evinrude or Johnson ??

    Not to beat a dead horse here but one more thing I thought about. When I removed the lower unit to check out the water pump I found it had 2 water hoses going to the top end. When I went to look up it’s water pump they all seemed to have just one. After a search I did find one that I think...
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    Evinrude or Johnson ??

    Thanks for everyones input. I guess I’m going to have to look for that #. I’m assuming it’s under the flat bar that holds the coils. Problems is I’m in upstate N.Y. with cold temperatures and just had shoulder surgery. But I’ll start up the wood stove in the garage as soon as my shoulder...
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