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iudi2006
10/11/2010 5:23pm
10/11/2010 5:23pm
Edited Date/Time
1/26/2012 12:29am
So my yz250f is having some carb issues. The carb will always easily get flooded and whenever i the turn the gas on it just leaks a lot of gasoline. Do you guys know what the problem probably is?
Sounds like you have a stuck float needle. The easiest thing to try first is:
turn the gas on and then rap repeatedly on the float bowl with the plastic end of a screwdriver. This will sometimes dislodge any dirt that may be keeping the needle from seating.
If this doesn't work then you have to either rotate the carb enough so you can get at the float bowl screws, or take the carb off. Take off the float bowl and give it a good cleaning with an aerosol can of carb cleaner. Spray the needle/seat area while moving the floats up and down. this should dislodge any dirt particles that may be causing the problem. Be VERY careful you don't bend the floats.
Try the screwdriver thing first and get back to me.
The Shop
Don't use a metal wrench!! BTW, if you read what I originally wrote you notice that I said the gas has to be ON when you tap the float bowl. That way the dirt can be flushed out with the flowing fuel.
You often can't see the groove worn into the "needle" with the naked eye, especially with neophrene coated needles. You also have no idea if a piece of persistant grit has worn a groove into the brass seating area.
Another thing to consider is a perforated float which fills with fuel and sinks, causing the needle to allow fuel to pass through even if the float bowl is full. For this test, very carefully remove the float assy and shake it next to your ear to see if you hear ANYTHING. The second step is to sink it in a gasoline-like fluid (put it in a jar and hold it down under the fluid level with something that will keep it submerged overnight). When you remove the weight, if the float doesn't shoot to the top, be suspicious. Don't forget to shake it and have another listen. PLEASE, try to avoid gasoline for this, and even if using alcohol or bulk brake-clean, put the beaker/jar outdoors and away from anything flamable.
Order a new float valve assy (OEM) but see where this all takes you and what it can teach us. Then, share it here.
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