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White smoke coming from crank case

  • Thread starter Thread starter Twowheeledlife
  • Start date Start date
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Twowheeledlife

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I have a 1977 GS550 and if it runs for about five minutes it starts to smoke from the crank case breather. I'm running pods so I bought a filter for the breather as someone suggested. Its a white smoke and has a slight smell of gas, is this something that I need to be worried about? As always any tips would be appreciated!
 
Any suggestions on why that's happening? One site that I saw said that it could be gas flowing from my petcock while the bike is off causing my float bowls to overflow into my intake manifold, would this be accurate?
 
Yup. First, yes, you should be concerned. Second, time to debug your fueling system. Look for things like a faulty petcock, sticky needle and seats, float levels too high, etc.
 
Would I be able to put my own shut off valve in line before the fuel reaches the carbs and change my oil? Would that possible eliminate my issue because I feel that I do have a petcock issue
 
If you have a vacuum petcock fuel should not flow when it is in the ON or RES position. However, don't bother changing the oil until you fix the problem.
Let me find you some instructions on debugging your petcock. I'll repost back here in a bit.
 
Twowheeledlife said:
Would I be able to put my own shut off valve in line before the fuel reaches the carbs and change my oil? Would that possible eliminate my issue because I feel that I do have a petcock issue
Click to expand...
You could or you could just order a new 1 from Z1 ;
# KL-4358--- $57.40
Plus you want to get that oil changed , gas in the oil is bad for motor and clutch:)
 
Don't buy any parts until you isolate the problem.
Do this:
get a drain pan or can.
place the petcock in ON position
pull fuel line and place in can
It should not drip at all
place in RES position
It should not drip at all
pull vacuum line
no fuel should be going through vacuum line
suck on vacuum line
fuel should flow through fuel line
If it passes all these tests, it is not the petcock.
post back with your results
 
I've found that just because something shouldn't happen doesn't mean that it won't. But I think I have a vacuum issue because if my bike sits for a day or two when I take it off the stand it will drop some gas from my float bowl overflow and I can't see why else it would do that
 
It could be multiple issues. First, find out where the fuel is coming from. The vacuum line or the fuel line. Second, why is your needle and seat not sealing correctly. Test, test, test. When you have peeled away all the layers of the onion, you will have a parts list that you need to fill out and order. Figure out all the issues before you start spending money.
 
My gas line has a steady drip when my petcock is in the "on" position
 
Twowheeledlife said:
My gas line has a steady drip when my petcock is in the "on" position
Click to expand...
So you have confirmed a bad petcock. Now why is it flooding the motor? is it that the float level is set incorrectly or do you have bad needle and seats on 1 or more carbs?:)Or is there rust or some other foreign matter missing things up on you?
 
I'd say a bad petcock, yes. I know that it's not any foreign material in there, I recently cleaned them very thoroughly so I'm not sure what else it would be seeing as I'm not too familiar with carburetors
 
hjfisk said:
So you have confirmed a bad petcock. Now why is it flooding the motor? is it that the float level is set incorrectly or do you have bad needle and seats on 1 or more carbs?:)Or is there rust or some other foreign matter missing things up on you?
Click to expand...
You need to check this also.

Think of it this way: You replace the petcock, but the needle and seat are still leaking. You can still overflow the carbs whilst riding and still have fuel in your oil. You have to fix both issues or you will still have problems.
Best of luck.
 
koolaid_kid said:
You need to check this also.

Think of it this way: You replace the petcock, but the needle and seat are still leaking. You can still overflow the carbs whilst riding and still have fuel in your oil. You have to fix both issues or you will still have problems.
Best of luck.
Click to expand...
Yes you have 2 things at least going on, petcock is confirmed as being bad , now it is definitely a needle and seat or more than 1 but why check your float heights first, if the are good find out which needle's are not holding fuel back. I test this with the carbs off the bike and a IV can of gas[ separate fuel source with a fuel line]hook it up turn on the fuel hold carbs level and see what one is leaking won't take long.:)
 
I run this test every time I rebuild a set of carbs. If it won't go at least an hour without leaking I take it back apart and fix the problem. I have a special wide glass pan that I set the carbs in and a 2x4 to keep the carbs in the proper orientation.
My carbs can go overnight without leaking; I have accidentally left my test tank connected more than once without any leaks.
 
koolaid_kid said:
I run this test every time I rebuild a set of carbs. If it won't go at least an hour without leaking I take it back apart and fix the problem. I have a special wide glass pan that I set the carbs in and a 2x4 to keep the carbs in the proper orientation.
My carbs can go overnight without leaking; I have accidentally left my test tank connected more than once without any leaks.
Click to expand...
Same here except I use the vice and a pan on the floor.:)
 
So, tonight I will buy a new petcock and when I put it on I'll use your methods to check and see which needle, if any are leaking. Correct?
 
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