Honda NHSO aeroBO 1983 Shop Manual page 177

TROUBLESHOOTING
ENGINE LACKS POWER
1 . Lightly accelerate engine
ENGINE SPEED INCR EASES
1
Check ignition timing
2.
CORRECT
�
3. Test cylinder compression
NORMAL
4.
Check carburetor for clogging
NOT CLOGGED
�
Remove spark plug
5.
NOT FOULED OR
DISCOLORED
�
6.
Check if engine overheats
NOT OVER HEATED
1
Try rapid acceleration or
7.
run at high speed
ENGINE DOES NOT KNOCK
1 8- 2
ENGINE SPEED DOES NOT ---- -.!1 1> ( 1 ) Clogged air cleaner
INCREASE SUFFICIENTLY
INCORRECT---- -- -- -• ( 1 ) Faulty CDI unit
TOO LOW---- -- -- --1 1Jo. ( 1 ) Worn cylinder or piston rings
TOO HIGH ---- -- -- --• ( 1 ) Carbon build·up in combustion
CLOGGED
---- -- -- --•
FOULED OR ---- -- -- --1 1Jo. ( 1 ) Plug not serviced frequently
DISCOLORED
OVER HEATED---- -- -- --. . ( 1 ) Worn cylinder or piston
ENGINE KNOCKS ---- -- -• ( 1 ) Excessive carbon build·up in
188
HONDA
NHBO
Probable Cause
Restricted fuel flow
(2)
(3) Clogged fuel tank cap breather
(4)
hole
Clogged muffler
Faulty pulse generator
(2)
Blown cylinder head gasket
(2)
(3) Flaws in cylinder or cylinder
(4)
head
Faulty or deteriorated reed valve
chamber
( 1 ) Carburetor serviced frequent·
not
ly enough
enough
(2) Use of plug with improper heat
range
Fuel air mixture too lean
(2)
(3) Use of improper grade of fuel
(4) Excessive carbon build-up in
combustion chamber
Ignition timing too advanced
(5)
combustion chamber
(2) Use of improper grade of fuel
(3) Clutch slipping
Fuel air mixture too lean
(4)
Date of Issue: May, 1983
© HONDA MOTOR CO., LTD.