Lots of exhaust smoke on 4 stroke
Posted August 14, 2008 - 07:42 AM
Now the real Newb question... (kind of embarrasing). I removed the engine cover for the rotor and it was full of oil, to my surprise!! I never worked on a 4 stroke that had oil flow to both sides of the engine. Is this right? Also are there any seals that might be a problem with the oil going up the timing chain and being blown out the exhaust?
I put some oil in it for a test drive and it burns it really fast, but the bike runs good.
The oil has to be getting sucked out of the crank and blown out the exhaust somehow.
Any help or info would really be appreciated.
Posted August 14, 2008 - 08:09 AM
Posted August 14, 2008 - 08:41 AM
Posted August 14, 2008 - 09:36 AM
Worn out valve guides will cause a lot of smoke without dropping compression.
but that would only smoke bad on startup, right? unless it was a REALLY bad leak.
When does it smoke? on start-up, when you rev it, at idle? What kind of smoke is it? Does it smell like oil? Or could it be water vapor? water in the combustion chamber means a head gasket or (worst case) a cracked head/case. I'm not sure of the engine design on the 150, but that's what happened to my old truck, coolant in the oil, turned out to be a cracked case.
if it smokes (oil) pretty much all the time, I'd be looking at the rings, or maybe the head gastet. Have you done a compression test? Running "good" is relative, especially since you don't know what it ran like when it was new...
Posted August 14, 2008 - 09:42 AM
Posted August 14, 2008 - 10:12 AM
I will start with valves and the head gasket. As for valve seals where are they?
Posted August 14, 2008 - 10:19 AM