Troubleshooting; Poor Performance At Low And Idle Speeds; Poor Performance At High Speed - Honda CR250R 2004 Owner's Manual

12. TROUBLESHOOTING

NOTE:
•
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 adjust-
ment (P-36)
CORRECT
3. Check it the air INCORRECT
cleaner is over-
oiled (P-23)
CORRECT
4. Check if the intake LEAKING
pipe is leaking
NOT LEAKING
5. Try spark test WEAK OR
INTERMITTENT
GOOD SPARK SPARK
6. Check the RC valve INCORRECT
(P-25)
CORRECT

POOR PERFORMANCE AT HIGH SPEED

CHECK
1. Check ignition
timing*
CORRECT
2. Disconnect fuel
POSSIBLE CAUSES
line at carburetor
(1) Improper ignition
and check for
timing*
clogging (P-35)
(Faulty ignition control
module)
(2) Faulty alternator*
(1) Fuel-air mixture too
UNRESTRICTED
lean (Turn the air
FUEL FLOW
screw in) (P-36)
(2) Fuel-air mixture too 3. Remove air
rich (Turn the air cleaner (P-23)
screw out) (P-36)
AIR FILTER
(1) Over-oiled air cleaner NOT DIRTY
4. Check carburetor
jets for clogging
NOT CLOGGED
(1) Deteriorated intake
pipe reed valve 5. Install a larger
gasket carburetor main
jet (P-46)
(2) Loose carburetor
(1) Faulty, carbon or wet CORRECT
fouled spark plug
(P-22) 6. Check the RC valve
(2) Faulty ignition control (P-25)
module*
CORRECT
(3) Faulty alternator*
(4) Faulty ignition coil*
(5) Broken or shorted
high tension cord*
(1) Control cables faulty
(2) Faulty exhaust
valves
(3) Carbon build-up in
exhaust valves
(4) Damaged exhaust
valves
POSSIBLE CAUSES
INCORRECT (1) Faulty alternator*
(2) Faulty ignition control
module*
(3) Faulty ignition pulse
generator*
FUEL FLOW (1) Lack of fuel in tank
RESTRICTED (2) Clogged fuel line
(P-35)
(3) Clogged fuel fill
cap breather tube
(P-2)
(4) Clogged fuel valve
(P-36)
(5) Clogged fuel filter
(P-37)
DIRTY (1) Not cleaned
frequently enough
(P-23)
(1) Contaminants in the
CLOGGED
fuel
(1) Jet size wrong,
CONDITION
WORSE reject in the opposite
direction (P-50)
INCORRECT (1) Control cables faulty
(2) Damaged exhaust
valves
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