• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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bottom end filling up with fuel

race-desert

race-desert

Husqvarna
AA Class
anybody have any idea why a 78 390 after sitting over night will fill the bottom end up with fuel--- I turn fuel off as i shut the bike off-this bike did this before and still after a total rebuild --it has new reeds-I do not want to have to run the motor till it runs out fuel(and oil)--------- floats set to high maybe????
 
1st check your fuel tap is sealing when the tap it off,its a good move to clean the filters on top of the tap,then check the needle and seat stop the flow to the bowl,then check the floats are set to the right height and still actually float.Its got to be one of the above,dumb question,the tap is off usual when pointing forward,easy to check with the hose off,I fitted an open road tank once,didn't ride the bike for a while and kicked my guts out only to remember on was pointing back and not down,if the tap does not leak
and you turned it off even if everything else is bad the bottom end should not fill up.The taps the fail safe,with it on and a fault with anything lower in the system then you get your result.That's why I ALWAYS turn off the taps when they go away in the shed.
 
Yes, make sure the petcock is off and that it is not flowing when off. If it is replace or rebuild it. Then Take your carb off and replace the float needle, it is leaking. Problem solved.
 
I had a 490 Maico with a Mikuni that did the same thing. The bottom end would fill up with fuel. I then tipped the bike upside down and emptied the fuel out the spark plug hole. I would disconnect the fuel line and tip the bike on it's side to empty the carb when it sat for a long period of time. I am sure it was a problem with the floats or needle and seat. I sold it...probably a big mistake as they are in big demand today.
 
Theoretically a person should not need the petcock, provided the float needle and seat is in good condition. "Turning off the gas" is a failsafe operation that we all do. If you're still getting gas down in the crank, then I would suspect both are at fault.
 
Old Geezer said:
Theoretically a person should not need the petcock, provided the float needle and seat is in good condition. "Turning off the gas" is a failsafe operation that we all do. If you're still getting gas down in the crank, then I would suspect both are at fault.
Click to expand...

Unless the floats are set to high.
 
On a Mikuni,make sure the little "U" shaped wire clip is on the needle/seat assembly,it keeps the needle from dropping too far down and binding so it wont close again.
 
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