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r69ing

black liquid coming out of exhuast

46 posts in this topic

Hey guys I have a old two stroke and there is this black mixture coming out my exhuast and spraying when I rev her up. My guess is that its oil and I probably need to bore my sleave because my chamber is leaking but I'm not sure.

Any ideas?

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i had this problem on my 65... had the wrong mixture cuz the person i bought it from told me the wrong ratio. adjusted to the ratio it was supposed to be and it cleared everything up. dunno... might not be the same problem you have though..

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rings could be going or wrong mixture the the other post said.

new top end and good gas mixed correctly.

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Only 2 answers, either wrong premix ratio or your crank seal on the clutch side is leaking.

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rings could be going or wrong mixture the the other post said.

new top end and good gas mixed correctly.

Rings have nothing to do with a 2 stroke blowing oil.

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I was told 32 parts to a gallon.

I replaced the spark plug today because it was all fouled up. I just pulled the new plug and it is drenched with the same black liquid shiat. I check the air filter thinking maybe the air / gas mixture was off and it wasn't burning correctly but the filter looked fine. &%$#@!! I've been working on this bike for a month and today is the first day it's been running. I ran the hell out of it for a few hours. When I stopped for a bit and tried to fire her back up she wouldn't start up and sounded flooded so that's when I pulled the plug. :naughty:

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I found the follow on the web, does this make sense?

If you’re getting excessive oil residue out the silencer, or fouling spark plugs, chances are you need to lean the jetting. Be sure to repack the silencer before beginning any rejetting.

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Only 2 answers, either wrong premix ratio or your crank seal on the clutch side is leaking.

Not sure about that :naughty: He ran the hell out of it for awhile shut her down then it wouldn't start. Maybe he has the wrong plug, wrong jetting or air/fuel mixture settings, off and on sticking float causing gas to pour unnecessarily into the carburetor :naughty: Don't sound like a leaking crank to me

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Hey guys I have a old two stroke and there is this black mixture coming out my exhuast and spraying when I rev her up. My guess is that its oil and I probably need to bore my sleave because my chamber is leaking but I'm not sure.

Any ideas?

You say it spits out black mixture when revving it up. Is it a good rev or does it hesitate, bog, backfire,spludge or what ever you want to call it when you rev it up? You said above that you ran the hell out of it so I'm assuming that it runs fine sometimes and sometimes don't start or run well, spits out black stuff?

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I found the follow on the web, does this make sense?

If you’re getting excessive oil residue out the silencer, or fouling spark plugs, chances are you need to lean the jetting. Be sure to repack the silencer before beginning any rejetting.

WRONG, do not start messing with the jetting till you get the oil problem fixed or you will end up with a huge mess.

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I replaced the plug early this morning. The bike start right up and ran perfect for hours but was spraying crap out the exhuast the whole time. I stopped her a few times and she started right up but on my last run I stopped it and now can't start it back up. It sounded bogged down and flooded. I turned off the gas and kicked the sh1t out of it, no good. I pulled the plug and it looked soaked!

Here is one thing to make note of, when the motor isn't running I have to turn of the pet cock on the gas tank other wise I getter gas leaking out of the drain hole in the carb if the bike sits off for to long. The guy I got it from said this has always been like this. Could the floater be jacked up? :naughty:

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what if the previous owner washed the bike without covering the exhaust and got water in there?

now you are just blowing that old water mixed with exhaust crap/oil and whatever else is in there out?

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Keep on eye on your trans fluid. If the crank seal starts to go south , it will run trans fluid through the motor. I run 40 to 1 and hve some spooge . I guess I'm used to it.

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do you guys have to turn off the gas valve also? Is gas leaking out the carb ok when the bike is off?

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Originally Posted by frogman

Only 2 answers, either wrong premix ratio or your crank seal on the clutch side is leaking.

Not sure about that He ran the hell out of it for awhile shut her down then it wouldn't start. Maybe he has the wrong plug, wrong jetting or air/fuel mixture settings, off and on sticking float causing gas to pour unnecessarily into the carburetor Don't sound like a leaking crank to me

__________________

Here is one thing to make note of, when the motor isn't running I have to turn of the pet cock on the gas tank other wise I getter gas leaking out of the drain hole in the carb if the bike sits off for to long. The guy I got it from said this has always been like this. Could the floater be jacked up? :naughty:

Bingo, your float is probably causing the problems

Its that or your running to Rich as you said above :naughty:

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Yes a float not working properly will cause too much gas to flow into the carb and out the carb and onto the floor

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rkjaco,

Thanks for pointing that out buddy! Now here is the big question..... How hard is it to replace the floats? From looking at the exploded view of the carb on my model bike there are 2 floats. Are the floats sticking and fixable or should I order a new set and tear the carb apart and replace them?

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