2003 Yamaha Bear Tracker 250 Carb Issue

[K L Buck Naff]

Trying to replace the carburetor on my 2003 Bear Tracker 250. Two brand new carbs in a row from different suppliers.   Both leak fuel out over flow and intake as soon as I turn the gas on. Any ideas. Am I doing something wrong?

[Randel1]

I have found that it is wise to pull the float bowl of any new or replacement carb. and examine the float level, jet size, needle and seat. Compare the jet sizes to assure they are the same as the original and make sure the float level is correct and the needle valve is not stuck.  Often times after market replacements lack the quality control standards of OEM parts.

[Frank Angerano]

Carburetor cleaning / rebuild By Frank Angerano, August 6, 2019 in General ATV Discussion 
Original Content From:

@Randel1 hit on some very good points. Nothing like an oem carb. Aftermarket carburetors never work well unless they are a very aftermarket manufacturer and that price would compare to the oem carb price.   
 

Take a look at this post and maybe it will help you out. 

Keep in mind that your float needle has a rubber tip on it that closes off the fuel when the float rises. It gets worn. Could be as simple as that.