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john-in-atl

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I have an 89 Classic Fifty tha

I have an 89 Classic Fifty that is now operational thanks to the help of this forum but it may not be tuned 100% yet. I don't have a tach but at full throttle it sounds good and I can reach 16 mph on a 21' pontoon which is better than before the fuel system rebuild. My question is at idle it seems to expel unburned fuel from the exhaust leaving little rings of fuel in the water. I can't adjust it with the low speed mix. Is this normal or have I missed something?

Thanks
John
 
"there should be no visible si

"there should be no visible sign of fuel, just a little smoke. Open cowl, pump fuel bulb with engine off and level, there should be no fuel dripping from inside of carbs.
Spark check, put timing light on each plug wire and look at gun for steady flashes with engine running, no flash=no spark."
 
"I don't see any fuel leak

"I don't see any fuel leaks. Would it hesitate or miss at full throttle with one cylinder not having spark? What if the plugs were the wrong ones, would that cause it? I have not changed the plugs since buying it. It is 100 miles away at the lake but when I go up next week on vacation I will take a timing light and check each wire."
 
you can go to sparkplugs.com a

you can go to sparkplugs.com and do a cross reference to check and see if your plugs are correct or same as oem.

i dont know how to do the cut and paste but if you jump to evinrude/johnson and go dowm to "79 carb adjust" on august 9 and scroll down till you find some answers from "vics" it will explain more on the plugs.
 
"you missed my point, by pumpi

"you missed my point, by pumping the bulb, if you had a leak it would show, BUT, by pumping the bulb and looking down the throat of each carb it will tell you if the float is set close to being right or sunk, or if the needle and seat is stuck. If the float is to high it will drip fuel out the venturi causing it to run rich and leave little rainbows in the water. At full throttle it would run fine unless the float sunk. Since there is no choke flap in the way its easy to see, unless on a toon
happy.gif
. If your good you can look down the carbs while under way and see fuel coming out the venturi, letting you know both carbs are working and not burning up 1/2 the engine. Sounds like something is still off. here's a link for carb setting at idle
http://www.themarinedoctor.com/cgi-bin//YaBB.pl?num=1150170058
And a cyl drop test
http://www.themarinedoctor.com/cgi-bin//YaBB.pl?num=1144247599"
 
"re-building a 1978 evinrude o

"re-building a 1978 evinrude outboard,85hp,85895c,replaced water pump, fuel lines ,fuel pump, spark plugs,re-built carbs, replaced timer base and stator, compression is fine. started motor on flush attachment, ran fine except overheated. removed water jackets,found clogged with salt, cleared clogs,and now it won't start.all ohmmeter tests on stator and base OK, resistance from spark plug ends to ground are all within 10%, only have fire on port bottom and starboard upper cylinders,did start to pull flywheel to access a water jacket cover during the water repair, but found I could get to it without pulling it, re-torqued it without pulling it.I believe this is all the info I can give you except that marine doctor recommended you for this problem, that it might be a bad trigger, but flywheel looked OK when I replaced the stator etc., could this be the flywheel maybe? Thanks for you effort!"
 
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