Keihin Carburetor Trouble Chart

1. Worn fuel valve (21) or dirty fuel valve seat.

2. Improper fuel level in float chamber (29).

3. Worn float (23) mounting tabs.

5. Damaged float chamber O-ring (28).

6. Loose float chamber screws (34).

1. Replace valve (21 ) or clean valve seat.

2. Adjust float (29) mounting tabs for correct fuel level.

7. Replace float (23).

1. Idling improperly adjusted.

2. Damaged low speed mixture screw (12).

3. Clogged bypass or idle port.

6. Air leaking into system.

7. Excessive fuel from accelerating pump.

Remedy:

1. Adjust idle.

6. Replace O-ring (20) and tighten mounting screws.

7. Check accelerating pump rod (7) length.

Poor Fuel Economy

Check for:

1. Fuel level too high.

3. Loose jets.

4. Idling improperly adjusted.

5. Choke not opening fully.

6. Dirty air cleaner.

7. Excessive fuel from accelerating pump.

Remedy:

1. Adjust level of float (23).

3. Tighten.

4. Adjust idle.

5. Inspect choke and choke wire and adjust.

7. Adjust fuel flow. Check accelerating pump rod (7) length.

Poor Acceleration

Check for:

1. Clogged accelerating system.

2. Damaged accelerating pump diaphragm (31).

3. Slow system improperly adjusted.

4. Clogged slow jet (25) or bleed tube.

2. Replace diaphragm (31).

3. Adjust slow system.

5. Adjust level of float (23).

Hard Starting

Check for:

1. Choke valve (41) not operating properly.

2. Idling improperly adjusted.

3. Generally dirty carburetor.

4. Loose carburetor mounting nuts.

1. Adjust choke system.

2. Adjust idle.

3. Disassemble and clean.

4. Tighten mounting nuts.

5. Inspect float (23) and fuel valve (21) and adjust or replace.

KEIHIN CARBURETOR TROUBLE CHART (CONI.)

Poor Performance On Road

Check for:

1. Idling improperly adjusted.

2. Fuel overflow.

5. Faulty operation of accelerating pump.

6. Air leak in intake system.

Remedy:

1. Adjust idle.

2. Inspect float (23) and fuel valve (21) and adjust or replace.

3. Inspect main jet (26) and tighten.

6. Check air cleaner backing plate and manifold mounting.

Poor High Speed Performance

Check for:

2. Improper fuel level in float chamber (29).

3. Dirt lodged in strainer in fuel tank.

4. Clogged main jet (26) or main jet air passage.

Remedy:

1. Inspect main jet (26) and tighten.

2. Adjust float (23) mounting tabs for correct fuel level.

3. Clean strainer.

4. Clean.

Abnormal Combustion (Fuel Mixture)

Check for:

1. Incorrect fuel mixture.

2. Generally dirty carburetor.

3. Dirty or clogged fuel line.

4. Air leaking into system.

Remedy:

1. Adjust carburetor.

2. Disassemble and clean.

3. Clean fuel line or replace.

4. Check mounting nuts for tightness or replace O-ring (20).

Loss of Power (Fuel Insufficient)

Check for.

1. Generally dirty carburetor.

2. Clogged fuel line.

3. Dirty fuel tank.

4. Air leaking into system,

5. Accelerating pump not working.

6. Clogged fuel strainer in fuel tank.

Remedy:

1. Disassemble and clean.

4. Check mounting nuts for tightness or replace O-ring (20).

5. Repair and adjust.

6. Clean strainer.

Loss of Power (Air Insufficient)

Check for:

1. Dirty air cleaner.

2. Throttle cable not working.

Remedy:

1. Clean air cleaner.

2. Check and repair throttle cable.

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