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17. Troubleshooting
Engine
Does Not
Start
Or
Is
Hard To Start 17-1
Engine Lacks Power
17-2
Poor
Performance
At High
Speed
Poor Handling
17-4
17-4
Poor Performance At low
And Idle Speeds
17-3
Engine Does Not Start Or Is Hard To Start
1. Check the fuel flow to carburetor
_
Not Reaching
Carburetor
- - - - -
-.
.
-
Reaching Carburetor
I
2. Perform a spark
test-- - - -
-__
Weak or No
Spark
--------~~
••
Good Spark
3. Test
cylinder
compression
---_.~
Low
Compression'
-
-- - -
-- - _
.
-
Compression Normal
j
4. Start by fo llOWing
normal
-----.~
Engine
Starts But Stops
- - - - -
-_
.
-
procedure
Engine Does Not Fire
j
5. Remove and
Inspect
spark plug
_
Wet
Plug-- - - - - - - - - -
-_
.
-
Dry
!
6. Start with choke o
n
Possible
Cause
Clogged fuel tube or fuel strainer
screen
Sticking floa
t
valve
Clogged fuel tank cap breather
Faulty spark plug
Fouled spark plug
Faulty COl unit
Broken or
short
ed spark plug wire
Broken or shorted ignition coil
Faulty pulse
generat
or
Faulty excitor coil
Faulty engine
st
op switch
Loose
or
disconnected ignition
system w ires
Stuck piston ring
Worn cylinder and piston ring
Damaged cylinder head gasket
Faulty reed valve
Cylinder head
f
law
Compression leak past crankcase
Improper
choke operation
Carburetor incorrectly adjusted
Intake pipe leaking
Improper ignition timing (Faulty
igni-
tion coil or pulse generator)
Crankcase leaking
Fuel
contaminated
Flooded carburetor or engine
Damaged
st
arter valve seat
Clogged air cleaner
17-1
m
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