Poor Performance At Low And Idle Speeds - Honda 1988 Z50R Service Manual

TROUBLESHOOTING
CHECK
PROBABLE CAUSE
I
8. Check for clogged carburetor - -_ CARBURETOR IS CLOGGED----_.- 111 Damaged fuel strainer
CARBURETOR IS NOT
CLOGGED
I
(2) Carburetor not serviced
frequentlv enough
9. Remove spark plug-------PLUG IS FOULED O A - - - - - -_ _ (1) Plug fouled
plug is not fouled or
DISCOLORED
DISCOLORED 121 Use of plug with improper heat
range
~
10. Check oil level by dipstick . Also--LEVEL IS TOO LOW OR TOO----••
,1} Oil level too high, resulting
in lack of power check oil for contamination HIGH
CRANKCASE IS FILLED TO
PROPER LEVEL
(2)
(3)
Oil level too low
Oil deteriorated or contami-
nated
11 .
~
.
Remove 011 check bolt from---- VAl VE TRAIN NOT LUBRI- ----~ ••
'1} Oil level too low
Clogged oil pipe
cylinder head to see if valve CATED PROPERLY (2)
train is lubricated properly (31 Clogged camshaft oil passage
VALVE TRAIN IS LUBRICATED
PROPERLY
~
12. Check. if engine overheats - - - -- ENGINE OVERHEATS - - - - - - -... (1) Excessive carbon build·up
ENGINE IS NOT OVERHEATED
1
combustion chamber
i21 Use of improper Quality fuel
131 Mixture too rich
(4)
Clutch slipping
13. Accelerate or run at high speed _ _ ENGINE KNOCKS _ _ _ _ _ _ __ _ , ( 1) Worn piston rings and cylinder
+
(2)
Fuel air mixture too lean
ENGINE DOES NOT KNOCK
(3)
Excessive carbon build·up in
combustion chamber
(4)
Ignition timing too early
POOR PERFORMANCE AT LOW AND IDLE SPEEDS
CHECK
PROBABLE CAUSE
1.
Check ignit ion t iming and------ I NCORRECT ----------~ ••
Il)
Improper valve clearance
valve clearance
(2)
Improper ignition timing IFaulty
CORRECT
I
2. Check carburetor adjustment
CORRECT
I
3. Check for air leaking past
carburetor insulator
NOT LEAKING
t
4 . Try spark test
GOOD SPARK
ignition control module (lCM) or
ignition pulse generator
INCORRECT - - - - - - - - - - -- ••• Fuel/air mixture too rich or too
lean .
L E A K I N G - - - - - - - - - - - -_ ..
/ l)
Deteriorated insulator O·ring
(2)
Loose carburetor
WEAK OR INTERMITTENT--- - -•••
( l )
Fault y , carbon or wet fouled
SPARK spark. plug
(2)
Faulty ignition control module
OCM)
(3) Faulty alternator
(4 ) Faulty ignition coil
(5) Faulty ignition pulse generator
15-3