2004-2009 Suzuki LT-Z250 Service Manual, Page 150Get this manual
FUEL SYSTEM
NEEDLE VALVE INSPECTION If foreign matter is caught between the valve seat and the needle valve, the gasoline will continue flowing and overflowIf the valve seat and needle valve are worn beyond the permissible limits, similar trouble will occurConversely, if the needle valve sticks, the gasoline will not flow into the float chamberClean the float chamber and float parts with gasolineIf the needle valve is worn as shown, replace and the valve seat with new oneClean the fuel passage of the mixing chamber using compressed airFLOAT HEIGHT ADJUSTMENT To check the float height, turn the carburetor upside downMeasure the float height while the float arm is just contacting the needle valve using vernier calipersBend the tongue as necessary to bring the float height to the specified level$ Float height A: 13.0 1.0 mm (0.51 0.04 in) 09900-20101: Venier calipers