Engine Does Not Start Or Is Hard To Start - Honda 1985 CBX750F Workshop Manual

~HON'DA
~
CBX750F ""
21. TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
22-1
ENGINE LACKS POWER
22-2
POOR PERFORMANCE AT LOW AND IDLE SPEED
22-3
POOR PERFORMANCE AT HIGH SPEED
22-3
HYDRAULIC TAPPET
22-4
POOR HANDLING
22-5
ENGINE DOES NOT START OR IS liARD TO START
,. Check fuel flow to carburetor
REACHING CARBURETOR
j
2. Perform spark test
GOOD SPARK
1
3. Test cylinder compression
COMPRESSION NORMAL
I
4. Start by following normal
procedure
ENGINE DOES NOT FIRE
1
5. Remove and Inspect spark plug
NOT REACHING CARBURETOR- ­
• (1)
(2)
(3)
(4)
(5)
WEAK OR NO SPARK-----__
.. (1)
(2)
(3)
(4)
(5)
(6)
LOW COMPRESSION -~-~- __
• (1)
(2)
(3)
POSSIBLE CAUSE
Fuel tank empty
Clogged fuel tube or fuel filter
Sticking float valve
Clogged fuel tank cap breather
hole
Faulty fuel valve
Faulty spark plugs
Fouled spark plugs
Faulty spark unit
Broken or shorted ignit'ion coil
Faulty ignition switch
Faulty pulse generator
Low battery charge
Valve stuck open
Worn cylinder and piston rings
(4) Damaged cylinder head gasket
(51 Seized valve
(6)
Faulty hydraulic tappet
(8) Excessive camshaft runout
ENGINE FIRES BUT STOPS - - - _ . . .
.(1)
Improper choke operation
(2)
(3)
(4)
(5)
WET P L U G - - - - - - - - -..
• (1)
(2)
(3)
(4)
Carburetor incorrectly adjusted
Manifold leaking
Improper ignition timing
(Spark unit or pulse generator)
Fuel contaminated
Carburetor flooded
Choke closed
Throttle valve open
Air cleaner dirty
21-1