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gas in oil

  • Thread starter Thread starter Charley Davidson
  • Start date Start date
C

Charley Davidson

Guest
What would cause gas to be on my oil and lots of it?
Bike only has three thousand original miles.
 
Failed petcock and for Gawdsake don't run it !! { or you parked it on prime }
 
Last edited:
yes, the vacuum operated petcock. the gas runs in through the vacuum line to the carbs. You can get hydraulic lock in the cylinders even. My first 850G did that in the 80s.
 
Thanks for the replies
what are the screws at the top of the carburetors in the front right on the throat by the intake
 
your carb balance/synch tool hooks up there. I don't have any 550s, but that is how my 1000s are. My 850s have the connection on the carb boot. Makes the boots more expensive.
 
Usually your float valve acts as a back-up to prevent gas from getting into the cylinders. But with enough pressure, gas will slip past too. Many of the newer motorcycles have stronger float valves or rubber-tipped ones to prevent this.
 
1_v8_merc said:
Usually your float valve acts as a back-up to prevent gas from getting into the cylinders. But with enough pressure, gas will slip past too. Many of the newer motorcycles have stronger float valves or rubber-tipped ones to prevent this.
Click to expand...
\If it comes in through the vacuum line, it the float valve may not even come in to play.
 
never understand why you guys refer to it as gas in the first place... :P
 
What kind of symptoms does a bad petcock or diaphragm cause on these bikes? After my coil issues were resolved the bike ran wonderful but just for a few days. It then started running like the other bike I have and the only common denominator was the carbs. I rebuilt the carbs about a year ago or less (complete with all new gaskets & o-rings plus cleaned in carb dip) I took them off the bike and cleaned them again with carb & choke cleaner. When put back on the bike only 1 bowl was full, another had a small amount of gas & 2 were bone dry. I'm kinda suspecting the petcock.

I ride 7 miles each way every day and have to fill up every day.
 
Charley Davidson said:
What kind of symptoms does a bad petcock or diaphragm cause on these bikes? After my coil issues were resolved the bike ran wonderful but just for a few days. It then started running like the other bike I have and the only common denominator was the carbs. I rebuilt the carbs about a year ago or less (complete with all new gaskets & o-rings plus cleaned in carb dip) I took them off the bike and cleaned them again with carb & choke cleaner. When put back on the bike only 1 bowl was full, another had a small amount of gas & 2 were bone dry. I'm kinda suspecting the petcock.

I ride 7 miles each way every day and have to fill up every day.
Click to expand...

Just reading about your issue. Are you saying you ride 14 miles and your using a tank of gas?
 
Charley Davidson said:
What kind of symptoms does a bad petcock or diaphragm cause on these bikes? After my coil issues were resolved the bike ran wonderful but just for a few days. It then started running like the other bike I have and the only common denominator was the carbs. I rebuilt the carbs about a year ago or less (complete with all new gaskets & o-rings plus cleaned in carb dip) I took them off the bike and cleaned them again with carb & choke cleaner. When put back on the bike only 1 bowl was full, another had a small amount of gas & 2 were bone dry. I'm kinda suspecting the petcock.

I ride 7 miles each way every day and have to fill up every day.
Click to expand...

With the petcock in the on position pull the gas line off. If any gas at all is dribbling out your petcock is shot. It can also dribble down the vacuum line.
Once you have replaced the petcock. Drain the oil and refill. Drive the bike for a few miles, maybe 25 or so. Drain the oil again and this time replace the oil and filter as well.
After each ride check your oil level to make sure that was your problem.
 
Scout said:
Just reading about your issue. Are you saying you ride 14 miles and your using a tank of gas?
Click to expand...
Yes

bccap said:
With the petcock in the on position pull the gas line off. If any gas at all is dribbling out your petcock is shot. It can also dribble down the vacuum line.
Once you have replaced the petcock. Drain the oil and refill. Drive the bike for a few miles, maybe 25 or so. Drain the oil again and this time replace the oil and filter as well.
After each ride check your oil level to make sure that was your problem.
Click to expand...
Do you mean the entire petcock or just the diaphragm?
 
Charley Davidson said:
Yes


Do you mean the entire petcock or just the diaphragm?
Click to expand...

Replace the entire petcock. If you do a search you'll find that our members have had little success with rebuild kits. Look on ebay. There is a guy called George that sells them way cheaper than the online stores. He may have your model.
 
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