Troubleshooting; Engine Does Not Start Or Is Hard To Start - Honda CB250N Shop Manual

18.
Troubleshooting
L
Engine
Does Not
Start
or
is
Hard
to Start
18-1
Engine Lacks
Power 18^2
Poor Performance
at
Low
and
Idle
Speeds 18-3
Poor
Performance
at
High
Speed
Poor Handling
18-4
18-4
Engine
Does Not
Start or
is
Hard
to Start
1.
Check
the
fuel
flow
to carburetor -
Reaching
Carburetor
Not Reaching
Carburetor
2.
Perform
a
spark
test-
Good
Spark
3.
Test cylinder
compression
-
Compression Normal
4. Start by
following normal
-
procedure
Engine Does Not
Fire
Weak
or
No
Spark
Low
Compression
-
Engine Starts But
Stops
-
5..
Remove
and. inspect spark plug *~
Wet
Plug
Possible
Cause
Clogged
fuel
tube
or fuel strainer
screen
Sticking float
valve
Clogged
fuel
tank
breather
Faulty spark plug
Fouled spark plug
Faulty
CDI
unit
Broken
or
shorted spark plug wire
Broken
or
shorted
ignition coil
Faulty
ignition
switch
Faulty pulse
generator
Faulty exciter
coil
Faulty
engine stop switch
Loose
or
disconnected
ignition
system
wires
Valve stuck open
Worn
cylinder
and
piston
ring
.
Leaking/damaged
cylinder head
gasket
Seized valve
Improper valve timing
Improper choke operation
Carburetor incorrectly adjusted
Intake pipe leaking
Improper
ignition
timing (Faulty
ignition coil or
pulse generator)
Fuel
contaminated
Flooded carburetor
Choke
closed
Throttle
val^e
open
Air
cleaner dirty
E?
18
1