1987-2006 Suzuki ATV LT80 Service Manual, Page 94Get this manual
FUEL AND LUBRICATION SYSTEM
NEEDLE VALVE INSPECTION
If foreign matter is caught between the valve seat and the needle, the gasoline will continue flowing and cause it to overflowIf the seat and needle are worn out beyond the permissible limits, similar trouble will occurConversely, if the needle sticks, the gasoline will not flow into the float chamber, Remove the carburetor, float chamber and floats, and clean the loat chamber and float parts with gasolineIf the need le is worn as shown below, replace it together wi valve seatClean the fuel passage of the mixing chamber with compressed air
DIAGNOSIS OF CARBURETOR
Whether the carburetor is producing proper mixture of fuel and air can be checked by making road test {simulating the way the user operates the machine) with standard spark plug (NG BPR7HS or NIPPON DENSO W22FPR For Canada modelNGK BP7HS or NIPPON DENSO W22FP-U For the other models) fitted to the engine, After the road test, remove the spark plug, and observe the appearance of the plug as well as the surface of the piston crownThe color observed tells whether the mixture is too rich or too lean, When replacing the spark plug, consul he page