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Old 11-18-2012, 07:54 PM   #1 (permalink)
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Unhappy pipe spitting oil

I have a 1978 yamaha exciter, ITS A 2 STROKE, i'm currently restoring it after i pulled it out of the back of yard 1 year ago for SITTING 15 YEARS. after restoring the fuel lines, changing fluids and messing with some wires i have the back up on a stand so i can spin the strack while its on. it starts in two pulls and compression seems good. the 2 times i really had the gas nailed to about 20 mph for about 5 minutes i noticed a gas/oil/watery mix coming spitting from the pipe alot. then i noticed oil dripping from the pipe where it mounts to the engine. I am not sure what the problem is. if the rings were bad, the compression would be low however it is not. i was thinking it was just spitting grime out from sitting for so long but i dont know for sure. also i was informed from someone that the rings just might need to swell back up since they were sitting. i dont know for sure so please help!
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Old 11-18-2012, 09:35 PM   #2 (permalink)
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Welcome to the forum!

The oil/moisture is likely coming from the crankcase to the pipe and should go away when the engine is up to operating temperature. After sitting for so long, any oil that was in the crankcase and on the crank has settled to the bottom of the crankcase. When you started the sled, the air/fuel mix picks up that old oil as well as the new stuff. Oil doesn't burn very well, so it ends up going into the pipe. A cold pipe will cause the oil to condense on the walls, and then drip out. A hot pipe will keep the oil in the exhaust gasses and it exits with the exhaust.

I wouldn't worry too much unless it's doing it after you are up to operating temperature. Then there could be an oil injection problem with the pump, such as a mis-adjusted pump or one that is injecting too much oil. In that case, you would probably be fouling plugs, as well.
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Old 11-19-2012, 06:14 AM   #3 (permalink)
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Welcome to the Snow Show! Did you clean the Carb!
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Old 11-19-2012, 10:46 AM   #4 (permalink)
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Ok thank you. If i keep starting it up and letting it run everyday will that help it for the long run? And yes i did clean the carb and i didnt touch the oil pump, i left that alone and only replaced the lines. Plugs are new so none are fouled. I just got worried after seeing a black spot about 2 feet in diameter under the pipe after running about 10 minutes while getting on the throtle.
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Old 11-19-2012, 11:06 AM   #5 (permalink)
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That's common. It will be worse if you start it up and run it every day, as the pipe doesn't get hot enough to keep the oil from condensing. You shut it down, the oil condenses. Next time you fire it up, the exhaust spits the oil out on the ground under the sled. It's the nature of 2-strokes. If I were to start my sled frequently, I would put a piece of tin under the exhaust so the oil would not get on the trailer or driveway.
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Old 11-19-2012, 12:39 PM   #6 (permalink)
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if you haven't touched the carb, I would ABSOLUTELY go through that! Most of us do it every season in fact, I just did mine this last weekend.
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Old 11-19-2012, 05:46 PM   #7 (permalink)
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Pay attention to the Pilot jet up the tube!
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Old 11-19-2012, 08:33 PM   #8 (permalink)
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Thanks now ill be able to focus on other things with it
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