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Author Topic:   Ruff Runnin Rude
Hobie1981 posted 07-08-2002 10:39 AM ET (US)   Profile for Hobie1981   Send Email to Hobie1981  
Morning Folks: My 1977 55 hp erude seems to still run a bit ruff at idle and rpm under 2500. No problem above 2500. Some backround: carbs rebuilt a few years back, were cleaned when engine was tuned up this past spring. Mechanic wanted me to run pre-mix at 150% for first two tanks of fuel. Had new NGK plugs (BR7HS). While runnin the 32:1 mix, and NGK plugs, engine would die out at idle.

Yesterday began running std 50:1 mix. Also changed plugs to Denso W22FS-U, gapped
at .030. Noticed a difference immediatly, engine seemed much happier at idle etc. (700 RPM).

Still seems a bit ruff however. Any suggestions ?? Was thinking along the line of adding a carb cleaner to the fuel mix. Oh btw gas tanks are new this year.

Quick funny story: Bride asked me while running the 32:1 mix. "I thought you had the engine fixed". It's not running right you know, maybe you should think of getting the new engine now, than wait until fall"

Her comfort level at using the boat was pretty low then, It went up when the Denso plugs and 50:1 mix were used.


sklein posted 07-08-2002 12:30 PM ET (US)     Profile for sklein  Send Email to sklein     
I'm digging up a distant memory here. My dad had a 1976 40hp Evinrude that also had idle problems. We found that there was a 'feature' that would disable the ignition on the lower cylinder during some idle conditions. It was in the form of a switch (I think vacuum actuated) that shorted the lower cylinder ignition. We found improvement by disconnecting this switch. The repair manual discussed its operation. May be worth checking a manual to see if your engine has this also.


Bigshot posted 07-08-2002 02:18 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Run some techron in the tank. put a few hours on it and change the plugs. You might also want to try and decarbonize it with OMC's "Tune up in a can" or Valvetech, etc.

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