Poor Performance At Low And Idle Speeds - Honda MBX50 Workshop Manual

TROUBLESHOOTING
CHECK
9. Ch}ck oil level. Also check
oil for contamination
CRAl\!KCASE IS FILLED TO
PROPER LEVEL
10. ChJck if engine overheats
ENGINE IS NOT OVERHEATED
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11. Accelerate or run at high speed
ENGINE DOES NOT KNOCK

POOR PERFORMANCE AT LOW AND IDLE SPEEDS

CHECK
Check ignition timing
1.
NORMAL
Ch}ck carburetor air screw
adjustment
2 .
NORMAL
leaking past carburetor
3.
packing
Air is
NOT LEAKING
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4.
Remove spark plug and try
spark test
GOOD SPARKS
18-4
LEVEL IS TOO LOW OR T00-----(1) Transmissio oil level too high,
HIGH
ENGINE OVERHEATS-------(1) Improperly adjusted oil pump
ENGINE KNOCKS---------(1) Worn piston rings and cylinder
INCORRECT
INCORRECT
LEAKING
WEAK OR INTERMIITENT
SPARK
�HONDA
� MBX50· MBX80
PROBABLE CAUSE
resulting in lack of power
(2) Transmission oil level too low
(3) No engine oil in oil tank
(4) Oil deteriorated or contami­
nated
(2) Excessive carbon build-up in
combustion chamber
(3) Use of improper quality fuel
(4) Mixture too lean
(5) Clutch slipping
(2) Fuel air mixture too lean
(3) Excessive carbon build-up in
combustion chamber
(4) Ignition timing too early
(advanced)
PROBABLE CAUSE
( 1) Faulty COi unit
Faulty alternator
(2)
( 1) Fuel air mixture too lean
(To correct, screw in)
Fuel air mixture too rich
(To correct, screw out)
(2)
( 1) Deteriorated insulator
0-ring
Loose carburetor
Deteriorated carburetor
(2)
(3) packing
( 1) Defective, or carbon or wet
fouled spark plug
Faulty alternator
Faulty ignition coil
(2)
(4) Faulty COi unit (3)