Honda CRF50F 2004-2015 - Engine Lacks Power

ENGINE LACKS POWER
1. Driv e Train Inspection
Raise wheel off the ground and spin by hand.
Does the whee l spin freelr ?
NO _ . Brake dragging
• Wo rn or damaged wheel bearings
YES - GO TO STEP 2.
2. Tire Pre ssu re Inspection
Check the tire pressure.
Is the tire pressure correct?
NO _ . Faulty tire valve
• Pun
ctured tire
YES - GO TO STE P 3.
3. Clutch Inspection
Accelerate r apidly from low to second.
Doe s the engine speed change Bccording ly when clutch is released?
NO _ . Clutch sl ipping
• Worn clutch d iscs/plates
• Warped clutch dis cs/ plat es
• Weak clutch spring
• Additive in engine oil
YES - GO TO ST EP 4.
4. Engine Performance In spection
Accelerate l ightly.
Does the engine speed increase?
NO _ . Choke valve closed
• Clogged air cleaner
• Restricted fuel flow
• Clogged muffler
• Pinched fuel tank breather hose
YES - GO TO ST EP 5.
5. I gnition Timing In spection
Check the ignition timing .
Is th e ignition timing normal ?
NO _ . Fau lty ignit ion control modu le
• Faulty igni ti on pulse generator
YES - GO TO STEP 6.
6.
Cylinder Compression Inspection
Test cylinder comp ression.
Is the compression normal ?
NO _ . Valve clearance too small
•
Worn cylinder and piston ring
• Leaking head gasket
• Se ized valve
• Improper valve t imi ng
YES - GO TO STEP 7.
7. Carburetor Inspection
Check the carbur etor for clogs.
Is the carburetor clogged?
YES - Ca rbur et or nOI serviced frequently eno ugh
NO - GO TO STEP 8.
TROUBLESHOOTING
16-3