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Oil blowing out of crankcase vent on '81 GS450

  • Thread starter Thread starter kkesler
  • Start date Start date
K

kkesler

Guest
Ok, got the bike I purchased running (quite easily, which was a suprise). It has K&N air filters so I added a piece of hose and a small filter for the crankcase vent. Oil is blowing out of that filter like crazy. In a few miles it had completey soaked the rear of the bike in oil. Bike has 7000 miles but is new to me so I have no idea of it's history. No smoking, runs fine otherwise so....ideas? Compression test?

Thanks,
Kurt Kesler
 
It's common for them to smoke lightly and drip a little oil occasionally, but it sounds like you have way too much blowing by. A compression test is in order. It could be ring blow by, guides, or guide seals.
 
Yea - I'll second that. Compression test time. My money is on the rings.
 
With so few miles on a 22 year old bike it probably is rings. The rings could be stuck or rust may have formed on the cylinder walls.
 
Ok, more info. After doing some more digging I went home and sniffed my oil. Overfull, thin and smells like gas. I checked the petcock and it is not shutting off so time for replacement/rebuild of that. Also went ahead and pulled the carbs and cleaned them. Once that is done will get the compression tested.

Thanks,
Kurt Kesler
 
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