Honda NHSO aeroBO 1983 Shop Manual page 176

ENGINE DOES NOT START OR IS HARD TO START
ENGINE LACKS POWER
POOR PERFORMANCE AT LOW AND IDLE SPEEDS
POOR PER FORMANCE AT H I G H SPEED
POOR HANDLING
OIL INDICATOR
FUEL GAUGE
STARTER MOTOR
ENGINE DOES NOT START OR IS HARD TO START
Check if fuel is getting to carburetor
1 .
by loosening drain screw
GETTING TO CARBURETOR
1
Try spark test
2.
SPAR K J UMPS
3. Test cylinder compression
NORMAL COMPRESSION
l
4.
Start by following normal
starting procedure
ENGINE DOES NOT FI R E
�
5. Remove spark plug
DRY
Date of Issue: May, 1983
© HONDA MOTOR CO., L TO.
1 8 . TROUBLESHOOTING
NOT GETTING TO
---- --•
CARBURETOR
WEAK O R NO SPARK---- -- -- -•
LOW COMPRESSION ---- -- -.
ENGINE FIRES BUT ---- --·
SOON STOPS
WET PLUG ---- -- -- -+
187
18-1
1 8-2
18-3
1 8-3
18-4
18-5
18-6
18-7
Probable Cause
No fuel in fuel tank
( 1)
Clogged fuel tube up to carbu-
(2)
retor, vacuum tube up to inlet
pipe
(3)
Clogged float valve
(4) Clogged fuel tank cap breather
hole
Clogged fuel strainer
(5)
Faulty spark plug
( 1 )
Fouled spark plug
(2)
(3) Faulty CD I unit
(4) Faulty pulse generator
(5) Broken or shorted high tension
wire
(6) Broken or shorted ignition coil
(7)
Faulty ignition switch
( 1 ) Stuck piston rings
Faulty or deteriorated reed valve
(2)
(3) Worn cylinder and piston rings
Flaw in cylinder or cylinder head
(4)
(5) Compression leak past crankcase
(6) Blown cylinder head gasket
( 1 ) Faulty control box
Air leaking past intake pipe
(2 )
(3) Improper ignition timing
(4) Carbon blocking exhaust system
Carburetor flooded
( 1 )
Faulty control box
(2)
(3) Throttle valve open excessively
1 8- 1