Troubleshooting - Honda CR125R 2006 Owner's Manual

Motocross motorcycle

Table of Contents

The items that are serviceable using this Manual are

followed by the page number reference in parenthesis. The

items that require use of the Honda Service Manual are

followed by an asterisk.

POOR PERFORMANCE AT LOW AND IDLE SPEEDS

CHECK

1. Check ignition

INCORRECT

timing*

CORRECT

2. Check carburetor

INCORRECT

air screw

adjustment

(P. 103)

CORRECT

LEAKING

3. Check if air is

leaking past

manifold

NOT LEAKING

4. Try spark test

WEAK OR

INTERMITTENT

SPARK

GOOD SPARK

5. Check the throttle

INCORRECT

position sensor*

CORRECT

6. Check the RC

INCORRECT

valve system

(P. 55)

CORRECT

POOR PERFORMANCE AT HIGH SPEED

CHECK

1. Check ignition

timing*

POSSIBLE CAUSES

• Improper ignition

2. Disconnect fuel

timing (Faulty ICM)*

line at carburetor

• Faulty alternator*

and check for

clogging (P. 35)

• Fuel-air mixture too

lean (Turn the air

screw in) (P. 103)

• Fuel-air mixture too

3. Remove air

rich (Turn the air

cleaner (P. 40)

screw out) (P. 103)

• Deteriorated reed

valve gasket

• Loose insulator

4. Check carburetor

clamp

jets for clogging

• Faulty insulator

• Faulty, carbon or wet

fouled spark plug (P. 48)

5. Install a larger

• Faulty ignition control

carburetor main

module*

jet (P. 103)

• Faulty alternator*

• Faulty ignition coil*

• Broken or shorted

spark plug wire

6. Check the RC

• Faulty throttle

valve system

position sensor*

(P. 55)

• Excessive carbon

build-up on the RC

valve

• Faulty RC valve

INCORRECT

CORRECT

FUEL FLOW

RESTRICTED

UNRESTRICTED

FUEL FLOW

DIRTY

AIR CLEANER

NOT DIRTY

CLOGGED

NOT CLOGGED

CONDITION

WORSE

CORRECT

INCORRECT

CORRECT