Honda 2004 CRF250X Service Manual

ENGINE LACKS POWER
1, Drive Tr ain Inspect ion
Raise wheel off the ground and spin by hand.
Did the wheel spin freefy?
NO _ . Brake dragging
• Worn or damaged wheel bearings
• Bent axle
• Drive chain too tight
YES - GO TO STEP 2.
2. Tire P ressure Inspection
Check tire pressure.
Is the tire pressures low?
YES _ . F au lty tire valve
• Punctured tire
NO - GO TO STEP 3.
3. Clutch Inspection
Accelerate rapidly from l ow to second.
Did the e ngin e speed change accordingly when clutch ;s engaged ?
NO _ . Clutch slipping
• Worn clutch discs/plates
• Warped clutch discs/plat es
• Weak c lut ch spring
• Sticking clutch lifter
• Additive in tran smission oil
YES - GO TO STEP 4.
4. Engine Condition In spection
Accelerate lightly.
Did the engine speed increase?
NO _ . Fueliair mixture too rich or lean
• Clogged air cleaner
• Restricted fuel flow
• Clogged muffler
• Clogged fu el cap breather hose
• Carburetor choke is on
• Excessive ca rbon build-Up in combustion chamber
YES - GO TO STE P 5.
5. Engine Knocking Inspection
Accelerate or run at high speed.
Is there knocking?
YES _. Worn piston and cylinder
• Use of poor quality fuel
•
Excessive ca r bon build-Up in combustion chamber
• Igni tion timing too advance (Faulty ICM)
• Lean fuel mixture
NO - GO TO STEP 6.
6. Ignition Timing Inspection
Check ignition timing.
Is the ignition timing correct?
NO _ . Faulty ignition control module oeM)
• Faulty ignition pulse generator
YES - GO TO STEP 7.
TROUBLESHOOTING
21-3

Honda 2004 CRF250X Specifications

General

Engine Type	249cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	78.0mm x 52.2mm
Compression Ratio	12.5:1
Induction	Keihin 37mm flat-slide carburetor
Transmission	5-speed
Final Drive	O-ring-sealed chain
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment separated into low-speed (13 positions) and high-speed (3.5 turns); 12.4 inches travel
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	100/100-18
Rake (Caster Angle)	27.5°
Trail	113mm (4.4 inches)
Wheelbase	58.3 inches
Seat Height	37.7 inches
Ground Clearance	13.4 inches
Ignition	CD with electronic advance