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  1. W

    75 OMC charging system

    Last time out while running at speed. The ammeter dropped to discharge range. It had been up around 30A +. When I got home the V reg.had softened up in the back. This is the one that mounts on the therm housing. Prestolite # vsh6201afy. I have done a search online for this # and got nothing...
  2. W

    Irratic timming

    After adding a rebuilt carb, setting the dwell. The timming is jumping, maybe 2 deg., from the setting mark. Where is the most likley problem? The chain cover does not have a timming mark that sticks out, it is just a slash molded into the cover. Anyone familiar w/these. The motor is a OMC...
  3. W

    Too much fuel pressure?

    The 350 chev I have( '75 225 OMC), Runs quite rich. I strongly suspect a new carb is in order(this one has been rebuilt). I haven't tested pressure yet. How likely is it that the fuel pump is pumping too much fuel? There is no filter at the carb, (Have the cannister type Filter/sep.) Can a...
  4. W

    '75 OMC foot rebuild?

    Hello men, I've been into a 225 hp OMC for about three mounths now. Removed heads, cleaned jackets, rebuild carb. The usual. Have the old 350 running quite well. Holding on a cool 160 deg. Major mildstone8) The LU only shifts into rev. I have ohmed the coils and get +/- 8 ohms resistance, on...
  5. W

    '75 OMC exhaust manifold

    Well I got the old 307 runnin' just fine...but When I hooked up the water it blasted from everywhere:^ Temp went to 200 preety quick. So I shut her off. The Exhaust manifolds are shot. Does anyone know if the manifolds from '78-84 will work w/ this '75 el. shift. I'm not finding any '75...
  6. W

    '75 exhaust manifold. etc.

    OK men some may remember my earlier posts about '75 OMC. Well it turns out she runs GREAT. Had to cuss, scream, beg.....but, she runs. I have cracked themo. housing and ex. man. The only ones I,ve seen (ebay). have ex. risers. Mine don't rise they leave the ex. man out the back and down through...
  7. W

    '75 OMC steeing tight.

    I've got it narrowed to the "shaft /gear" going through the upper gearcase. I believe the way to go is to remove and clean,...correct? Got a manual comming, but I'm not sure I can wait. How do I remove this shaft to clean and free it up Thanks for all replies. WK
  8. W

    New shifter?

    I have a '75 El. shift OMC. The shifter sw inside the binicle is toast. Is there a new binicle that will work. Or do I have to find a '75 binicle Thanks WK
  9. W

    Newbie w/Oldie

    Hey y'all, Neat forum. Just puchased a '75 mako w/225 OMC, 307 GM v8 Haven't ever run an I/O. Eventually plan a repower. But....funds prevent that now. Anyway, whats the chance this baby will run. Owner says it was running last year. Not so worried about the motor, its the OD that concerns me...
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