carb problem

i recently bought a 2000 yz 250 i cleaned the carb but i keep dumpin fuel from the over flow wat is it?  

Do you mean Gas is comming out of the over flow when you drive and when you stop? I had the same problem with my old bike and the problem is simple i am sure, i can't tell you it because i don't know that much about carbs bu someone could.  
My ride -2002 KX 125

Check the float, it is probably set to high.  
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Jehovah-jireh: The Lord Will Provide.

ok ya or i was also told it could be cracked or a small hole or something? but i just happens when i leave it sit in the shed when its running it does not do this so i think its just from sitting and the gas is just fillin up in the bowl.  

Yah sounds like the floats stuck somehow? Check the float see if it....uh floats lol.

You say its from sittn in the shed and the bowl fills up? Do you not shut the gas off when its sitting?  
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Trev
2008 YZ250

i do shut off the gas but it still leaks. so im going to get a new fuel control valve.  

I just learned how to adjust the float on mine and it was amazingly simple. But when you take the carb off and take the float off check the pin and seat and make sure there's nothing stuck in there cause if it doesn't seat properly then it won't matter how you adjust your float . They recommend changing the pin and seat when they wear. The float height adjustment is just done by bending the little flap that contacts the pin . It's hit and miss how much you need to bend it but it should't be to much. Don't bend it more than you need to however otherwise it will mess with the way your carb works and you may not get optimal amount of fuel in the carb. Don't stress about it though. just bend it a bit slap it all back together and see if that helped. I'd also make sure the floats are the same height and the assembly isn't bent a bit and make sure the floats aren't leaking and taking on fuel.  
1978 Yamaha 175 MX
Northern Ontario
Canada
31 yrs young
WHEELIES!
Yaaaayyyyyy!

What is the correct float level around 90 degrees?  
My ride -2002 KX 125

the correct float level is watever height so it doesnt leak out the overflow lol you see guides that tell you to measure from the gasket to the bottom of the float and compare to what it's supposed to be...but then you need to know that measurement and I'd imagine it's in a shop manual somewhere...just do like me and bend the tang slap it all back together and see if it leaks.It's not like yur gunna cause damage if you bend it to much or to little so don't stress about it. check the needle valve and seat and make sure they aren't worn or that there isn't something stuck in there first before adjusting your float though  
1978 Yamaha 175 MX
Northern Ontario
Canada
31 yrs young
WHEELIES!
Yaaaayyyyyy!