Carburetor Check Sheet

GC-GCV135/160/190 - GS-GSV160/190

Priority check Points : 1 2 4 5 9 10

• Unstable idle speed

• Poor performance at low speed

1 Pilot screw clogged.

Remove foreign material/dirt.

Replace pilot screw.

2

Pilot jet clogged.

3

Pilot jet air path clogged.

Remove foreign material/dirt.

Remove foreign material/dirt.

• Engine will not start

• Difficult starting

• Engine starts but stops quickly

4

Main jet clogged.

5 Main nozzle clogged.

Use needle A ( ∅ 0.5) to clean

Remove foreign material/dirt.

Remove foreign material/dirt.

6

Main nozzle air path clogged.

7

Throttle stop screw position incorrect.

8

Float doesn’t move properly.

Remove foreign material/dirt.

Set correct idle speed.

Remove foreign material around float pin.

7

6

10

9

4

12

Air flow Fuel flow

F

UEL

C

OMPRESSION

COMBUSTION

ESSENTIALS

I

GNITION

Before inspecting the fuel system, perform the minimum inspection for compression and ignition system.

Mixture

1

2

3

5

8

11

• Engine speed will not increase

• Poor performance at high speed

• Unstable engine speed

1

Pilot screw clogged.

2

4

Pilot jet clogged.

3 Pilot jet air path clogged.

Main jet clogged.

5

Main nozzle clogged.

6 Main nozzle air path clogged.

11

For extended storage of

the engine

(More than 3 months).

12 Float chamber check.

Remove foreign material/dirt.

Replace pilot screw.

Remove foreign material/dirt.

Remove foreign material/dirt.

Remove foreign material/dirt.

Remove foreign material/dirt.

Remove foreign material/dirt.

Drain gasoline from float chamber by running the engine until it stops or by loosening the drain screw while engine is stopped.

Water inside float chamber.

Take off float chamber and clean or replace.

• Overflow

• Gasoline leak

9

Float valve worn or coated with foreign material/ dirt.

10

Valve seat coated with foreign material/ dirt.

Remove foreign material/dirt.

Remove foreign material/dirt.

Take care not to damage the seat surface.

Idle rpm Middle rpm

Using of Carburetor Cleaning Kit

(Kit No.07JPZ-0010001)

Carburetor cleaning kit for removing foreign material/dirt.

Needle A (

∅ 0.5)

(Main jet)

Needle B (

∅ 0.3)

(Pilot jet)

Pump nozzle

(Air blow for jets and air paths)

Max rpm

Screw driver

(Main jet assemble

/disassemble)

Pilot screw and limiter cap replacement

PILOT SCREW

Aplly LOCTITE 638

LIMITER CAP

Pilot screw brakes at narrow point.

When the cap is removed, the pilot screw breaks at the neck. To remove the remaining screw, fit an appropriate rubber tube over the remaining stub and unscrew.

Install a new pilot screw and set it to the specified position. (Refer to shop manual.) Then install the limiter cap with

LOCTITE 638.

www.honda-engines-eu.com