fuel in crank case, diagnose help?
Thread Starter
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Road Master
Joined: Feb 2007
Posts: 860
Likes: 28
From: southbury connecticut
Your bike is 29 years old so if the following parts mentioned have not been replaced in the past couple of years, then do so!
Get a new non vacuum operated petcock and get in the habit of turning it off when you stop riding for any length of time. Replace fuel line from petcock to carb and replace vacuum line from carb to VOES if either of the hoses is more than a few years old. Don't forget the 3/16" bottom of the tank crossover fuel line (line that goes from one side of tank to the other).
Give the carb a good once over cleaning, replace the float needle. Make sure you get the correct (duplicate needle) float needle. Should be a 4 sided float needle. Get a OEM float needle if you can find, CV Performance if you can't. Consider new carb to manifold and intake seals just because of age. Could probably wait on the intake manifold seals till winter if not familiar with changing them. (do some homework on how to)
Clean the seat the float needle sits in. Use some polishing compound on a Q-tip to clean up the seat as it is not replaceable. Spin Q-tip with fingers and make sure it's shiny and clean. Use carb spray to clean the residual polishing compound. Check float height-this is tricky and there is a specific way of doing it.
https://cv-performance.com/carburetor-parts
https://www.youtube.com/watch?v=g6y32Gw5HK4
Your bike will not sump oil into the crankcase because the oil tank is lower than the oil pump and oil pump check valve. So the amount of oil in your crankcase is minimal at best. Your oil is getting fuel diluted by either an overly rich condition or the float/needle is leaking fuel into the engine. Check your spark plugs for an overly rich condition and change your oil/filter to get the diluted fuel out.
Get a new non vacuum operated petcock and get in the habit of turning it off when you stop riding for any length of time. Replace fuel line from petcock to carb and replace vacuum line from carb to VOES if either of the hoses is more than a few years old. Don't forget the 3/16" bottom of the tank crossover fuel line (line that goes from one side of tank to the other).
Give the carb a good once over cleaning, replace the float needle. Make sure you get the correct (duplicate needle) float needle. Should be a 4 sided float needle. Get a OEM float needle if you can find, CV Performance if you can't. Consider new carb to manifold and intake seals just because of age. Could probably wait on the intake manifold seals till winter if not familiar with changing them. (do some homework on how to)
Clean the seat the float needle sits in. Use some polishing compound on a Q-tip to clean up the seat as it is not replaceable. Spin Q-tip with fingers and make sure it's shiny and clean. Use carb spray to clean the residual polishing compound. Check float height-this is tricky and there is a specific way of doing it.
https://cv-performance.com/carburetor-parts
https://www.youtube.com/watch?v=g6y32Gw5HK4
Your bike will not sump oil into the crankcase because the oil tank is lower than the oil pump and oil pump check valve. So the amount of oil in your crankcase is minimal at best. Your oil is getting fuel diluted by either an overly rich condition or the float/needle is leaking fuel into the engine. Check your spark plugs for an overly rich condition and change your oil/filter to get the diluted fuel out.
its funny because i also have a 1996 springer and i just rebuilt that carb about 2 weeks ago..
\thank you for your advise.
HDF Community Team
Joined: Dec 2005
Posts: 5,419
Likes: 2,621
From: NC USA
Never a bad idea to keep a carb kit around but...
If you're sure it didn't leak out the petcock, thru neither the fuel line nor the vacuum hose, then where did the fuel come from that filled up the oil pan - thru the carburetor you're about to rebuild?
If you're sure it didn't leak out the petcock, thru neither the fuel line nor the vacuum hose, then where did the fuel come from that filled up the oil pan - thru the carburetor you're about to rebuild?
Road Master
Joined: Sep 2013
Posts: 1,054
Likes: 441
From: Tejas
They're always causing issues.
Griz
I'm in such a habit of turning of the petcock (50 uears worth), I often reach down on other bikes, like my EFI TC Ultra, then I just smile to myself.
I hate vacuum operated petcocks and usually replace them.
Last note, when I have an issue and ask a question, I try to understand the answers given and follow the logic, as well as learning who the sources of the feedback are. After all, they are trying to help and most often speaking from experience, Their bike is not the one with the problem.
I hate vacuum operated petcocks and usually replace them.
Last note, when I have an issue and ask a question, I try to understand the answers given and follow the logic, as well as learning who the sources of the feedback are. After all, they are trying to help and most often speaking from experience, Their bike is not the one with the problem.
Road Master
Joined: Sep 2021
Posts: 759
Likes: 936
From: Under the affluence of incahol.
Could have been a small bit of crud stuck under the diaphragm in the petcock or float needle. Or as already posted, could be a hole in the diaphragm allowing fuel to dribble down the vacuum line into the manifold. I eliminated the vacuum diaphragm on mine for this reason. It is just more EPA mandated unnecessary complication. Just remember to always turn the petcock off when not riding. The vacuum shut off is not to be relied upon.
Thread Starter
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Road Master
Joined: Feb 2007
Posts: 860
Likes: 28
From: southbury connecticut
i parts for the rebuild are in the mail, its been years since the carb has been off so i will do a rebuilt its quick and easy. i has working on my garage and starting the bike pulling it into the driveway and turn the bike off, i prolly did this 10 times over a period of 2 weeks, so if the float needle was dirty the fuel could dump into the engine. Then when i start it the next day the carb bowl fills and it happens again over and over.
Thread Starter
|
Road Master
Joined: Feb 2007
Posts: 860
Likes: 28
From: southbury connecticut
Could have been a small bit of crud stuck under the diaphragm in the petcock or float needle. Or as already posted, could be a hole in the diaphragm allowing fuel to dribble down the vacuum line into the manifold. I eliminated the vacuum diaphragm on mine for this reason. It is just more EPA mandated unnecessary complication. Just remember to always turn the petcock off when not riding. The vacuum shut off is not to be relied upon.
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Thread Starter
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Road Master
Joined: Feb 2007
Posts: 860
Likes: 28
From: southbury connecticut
its not the petcock, thanks
Thread Starter
|
Road Master
Joined: Feb 2007
Posts: 860
Likes: 28
From: southbury connecticut
I'm in such a habit of turning of the petcock (50 uears worth), I often reach down on other bikes, like my EFI TC Ultra, then I just smile to myself.
I hate vacuum operated petcocks and usually replace them.
Last note, when I have an issue and ask a question, I try to understand the answers given and follow the logic, as well as learning who the sources of the feedback are. After all, they are trying to help and most often speaking from experience, Their bike is not the one with the problem.
I hate vacuum operated petcocks and usually replace them.
Last note, when I have an issue and ask a question, I try to understand the answers given and follow the logic, as well as learning who the sources of the feedback are. After all, they are trying to help and most often speaking from experience, Their bike is not the one with the problem.