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Pilot jetclogged.
Carburetor Check Sheet GCV520/530 - GXV520/530
• Unstable idle speed • Poor performance at low speed
Pilot jet air path clogged.
1
2
Remove foreign material/dirt.
Remove foreign materials/dirt.
Main jet clogged.
• Engine will not start • Diffi cult starting • Engine starts but quickly stops
Main nozzle clogged.
3
4
Remove foreign material/dirt.
Remove foreign material/dirt.
• Overfl ow • Gasoline leaks
Pilot jet clogged.
Remove foreign material/dirt.
Air fl ow Fuel fl ow Mixture
Float valve worn or coated with
foreign material/dirt.
Remove foreign material/dirt.
Valve seat worn or coated with
foreign material/dirt.
Remove foreign material/dirt.
• Engine speed will not increase• Poor performance at high speed • Unstable engine speed
1
8
Pilot jet air path clogged.
Remove foreign material/dirt.2
Main jet clogged.
Remove foreign material/dirt.3
Main nozzle clogged.
Remove foreign material/dirt.4
Main nozzle airpath clogged.
Remove foreign material/dirt.8
For extended storage of the engine
(More than 3 months).
Drain gasoline from fl oat chamber by running the engine until it stops or by loosening the drain screw while engine is stopped.
10
Fuel cut solenoid valve
Connect the 12V battery to the fuel cut solenoid valve connector as shown.Check the needle of the valve should retract in.
Using of Carburetor Cleaning Kit (Kit No.07JPZ-0010000)Carburetor cleaning kit for remounts foreign material/dirt.
Needle A ( 0.5) (Main jet)
Needle B ( 0.3) (Pilot jet)
Pump nozzle(Air blow for jets and Air paths)
Screw driver(Main jet assemble
/disassemble)
FUEL
COMPRESSION IGNITION
THREE ELEMENTS OF ENGINE
Before inspecting the fuel system, perform the minimuminspection for compression and ignition system.
1 3 4 8 9Priority check Points :
Use needle B ( 0.3) to clean
Use needle A ( 0.5) to clean
6
9
8
4
3
Check of fl oat chamber
Water inside Float chamber. Take off Float chamber and clean.
11
10
1
7
12
11
5
2
Use needle B ( 0.3) to clean
Main nozzle airpath clogged.5
6
Remove foreign material/dirt.
Set correct idle speed.Throttle stop
screw position incorrect.
7 Remove foreign material around fl oat pin.
Float doesn’tmove properly.
OFF ON
Use needle A ( 0.5) to clean
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4102_carbu_GCV_GXV.indd 14102_carbu_GCV_GXV.indd 1 13-05-2005 14:58:3213-05-2005 14:58:32
