Honda XL350R 1984 Shop Manual page 229

19.
TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
ENGINE LACKS POWER
19- 1
19- 2
19- 3
19-4
19-4
POOR PERFORMANCE AT LOW AND IDLE SPEEDS
POOR PERFORMANCE AT HIGH SPEED
POOR HANDLING
ENGINE DOES NOT START OR IS HARD TO START
1. Check if fuel is getting to the
carburetor
GETTING TO CA RBURE TOR
I
2. Try spark test
GOOD SPARK
3. TEST CY
LI NDER
COMPR ESS ION
COMPRESSION NORMAL
I
4. Start by following normal
starting procedure
ENGINE D OES NOT FIRE
I
5. Remove spark plug
DRY
I
6. START WI T H CHOKE
APPLIED
Probable Cause
NOT GETTING TO--- - - - ---
(1)
No fuel in fuel tank
CARBURETOR (2) Clogged fuel tube or fuel filter
(3) C logged float valve
(4) Clogged fuel tank cap breather
tube
WEAK OR NO S P A R K - - - - - - . (1) Faulty spark plug
(2) Fouled spark plug
(3) Faulty COl unit
(4) Broken or shorted high spark
p lug wire
(5) Faulty alternator
(6) Broken o r shorted ig n ition coil
(7) Fau lty engine stop switch
(8) Fau lty pu lse generator
(9) Poorly connected, broken or
shorted wires
lOW COMPRESSION------- .
(1)
Valve clea rance tOO small
(2) Valve stuck open
(3) Worn cylinder and piston rings
(4)
Damaged cylinder head gasket
(5)
I mproper valve timing
(6)
Improperly adjusted decompres·
sion mechanism
(7)
Seized valve
ENGINE STARTS BUT - - - - - -- .
( 1)
Choke excessively open
SOON STALLS (2) Carburetor air screw excessively
closed
(3) Air leak ing past intake pipe
(4) Improper ignition timing (COl
unit or pulse generator faulty)
WET PLUG - - - - - - - -- -
(1)
121
131
Carburetor flooded
Carburetor choke excessively closed
Th,ottl' ","
''''''''''y
op,n
II
19-1