Honda CRF50F 2004-2015 - Low;Idle Speed Performance Issues; High Speed Performance Issues

POOR PERFORMANCE AT LOW AND IDLE SPEED
1. Carburetor Air Screw Inspection
Check the car bur eto r ai r screw adjustment.
Is the air screw correct?
NO - (page 5- ' 3)
YES - GO TO STEP 2.
2. Intake Mantfold leaking Insp ectio n
Check for leaks in the intake Manifold .
Is th ere Isaking ?
YES _ . loose carburetor mounting bolts
• Damaged insulator
NO - GO TO STEP 3.
3. Spark Test
Perform a spark t es t.
Is ther e a good spark?
NO _ . Faulty or fouled spark plug
• Faulty ignition con trol module
• Faulty ignition coil
• Broken or shorted spark plug wire
• Faulty engine stop switch or ignition switch
• Faulty ig nition pul se generator
• Loose or disconnected igniti on system wires
YES - GO TO STEP 4.
4. Ignition Timing Inspection
Check th e ignition timing .
Is the Ignition timing normal ?
NO - Improper ignition t iming (Faulty ignition control modu l e)
POOR PERFORMANCE AT HIGH SPEED
1. Fuel lin e Ins pection
Disconnect th e fuel hose at the carburetor.
Does th e fuel flow freely?
NO _ . Clogged fuel line
• Clogged fuel tank breather hose
• F aulty fuel v alve
• Clogged fuel st rainer
YES - GO TO ST EP 2.
2. Carburetor In spection
Rem ove the carburetor and check for clogge d jets.
Are the jets clogged?
YES - Clean
NO - GO TO STEP 3.
3. Valve Timing In spection
Check the va lve timing.
Is the lIal1l8 timing corr ect?
NO - Cam sprocket not ins talled properly
YES - GO TO STEP 5.
4. Ignition Timing Inspection
Check the i gnition timing .
TROUBLESHOOTING
16-5