Engine Does Not Start Or Is Hard To Start - Honda CB400T Shop Manual

4
HONDA
0
C B 4 0 0 T
1 9. TROUBLESHOOTI MG
ENGINE DOES NOT START OR IS HARD TO START
Possible Cause:
1.
Loosen drain screw and check NO FUEL A T
-
(11 Fuel tank empty
for fuel at the carburetor. CARBURETOR (2) Clogged fuel tube or fuel filter
(31 Clogged fuel inlet
FUEL REACHING CARBURETOR
(4) Clogged fuel tank cap breather hole
I
t
2. Remove spark plugs and t r y
spark test.
GOOD SPARK
I
1
3. Test cylinder compression
COMPRESSION NORMAL
I
4. T r y t o start following normal
procedure.
ENGINE DOES NOT FIRE
I
5. Remove and inspect spark
plug.
D R Y PLUG
I
I
6. Restart w i t h choke applied.
WEAK OR NO SPARK
*
(1
1
Faulty spark plug
(2) Fouled spark plug
(31 Faulty C.D.I. Unit
(4) Broken or shorted high tension cord
(51 Faulty A.C. generator
(6) Broken or shorted ignition coil
. .
(71 Faulty main switch
COMPRESSION LOW
-
(1) Kick pedal slipping
(2)
Inadequate valve clearance
(31 Valve stuck open
(4) Worn cylinder and piston rings
(51 Damaged cylinder head gasket
( 6 )
Valve timing incorrect
ENGINE FIRES BUT
(1) Misuse o f choke
STOPS
(21 Carburetor pilot screw setting
incorrect
(31 A i r leaking past manifold
(4) Ignition timing incorrect (C.D.I. unit
or A.C. generator at fault)
WET PLUG
*
(1) Carburetor flooded
(21 Carburetor choke closed
(31 Throttle valve opened
Date of Issue: September, 1977
O
HONDA MOTOR CO.. LTD.