13
4
Fuel system
Notice in maintenance Adjustment for height of float
Trouble shooting Installation of carburetor
Disassembly for carburetor Adjustment for idling speed
Disassembly for float, float needle and injection nozzle
Notice in maintenance
Summary
1. Be careful when gasoline is in using, keep good air ventilation in working place,
and also keep far distance to spark and fire.
2. Pay attention to position of
“
Ｏ
” ring when disassembling parts of fuel system, and
replace by new
“
Ｏ
” ring when re-assembly.
3. There is oil drainage screw at the bottom of float chamber, and this screw could be
Loosened and drain off gasoline in float chamber
Troubleshooting
A. Engine could be ignited but unable to start C. High concentration of mixing gas
1. No fuel in fuel tank .1. Too high the fuel level in caburetor
2. No fuel entered carburetor 2. Air nozzle of carburetor blocked
3. Too much fuel in cylinder 3. Float seized ot float needle failure
4. Air filter blocked 4. Dirty air cleaner
B. Low concentration of mixing gas
D. Unstable idling, stalling speed and bad rotation of engine
1. Nozzle of carburetor blocked 1. Incorrect idling adjustment
2. Breathing hole on fuel tank cap blocked .2. High concentration of mixing gas
3. Fuel filter blocked
…… 3. Low concentration of mixing gas
4. Bad fuel flow in fuel tube 4. Low compression in cylinder
5. Float needle failure .5. Air filter blocked
6. Low fuel level in carburetor 6. Expired fuel
……..7. Impurity in fuel