Service Manual

1-13 GENERAL INFORMATION
TROUBLE SHOOTING points.
This chart describes typical troubleshooting
If engine malfunctions, check if the way the en- procedures.
gine
is used is correct. If engine malfunctions Do not unnecessarily disassemble carburetor,
even if engine
is used correctly, systematically magneto or engine unless it has been found to be
carry out troubleshooting starting with simple the cause of malfunctioning.
[Engine hard to start]
I
Remove spark plug and
check spark by crank-
ing engine while having
the plug touched again-
st engine block.
WARNING:
Keep the plug as far
away
as possible from
the plug hole.
To avoid an electric
shock, do not hold the
plug
itself.
,Make sure to hold the
plug cap.
between high tension
lead and engine block
in the
state where plug
Are sparks produced
between high tension
lead and engine block
when control unit
is
replaced?
Make starting attempts
number of times
and then remove spark
plug and observe elec-
Are they wet?
[odes.
gap
wheel
Demagnetized fly- Replace
NO-
Y ES-,
into fuel pipe or filter
tank cap
Plugged fuel line Clean
turn the crankshaft
without loading
in float bowl
Worn piston/piston
rings
t Replace
Check carb.
fuel line.
air passage.
Check for plugged
Check float
level.
Stuck piston rings Clean or replace
Worn cyl. bore Bore or replace
tightening
seat
Plunge-up by valve Adjust valve clearance
Warped cyl. head
Broken
valve spring Replace
Replace
Stuck
valve Clean or grind