Service Manual
GENERAL INFORMATION
1-16
[Fuel consumption
is
excessive]
compression sufficient?
Is
r
High fuel
level
in carb.
-Adjust
float chamber (including
overflow)
Delay
is
ignition timing
High idling
R.P.M.
-Adjust
choke
Incomplete opening of
-Adjust
Excessively backed off car-
choke
valve
burator pilot air screw
Replace
Stuck piston
Worn cylinder bore
-Clean or replace
insufficient cyl. head tigh-
-Bore or replace
Faulty
valve
seat
contact
Plunge-up of
valve
-Adjust
valve
clearance
Wrong
valve
timing -Adjust
Broken
valve
spring
-Clean
or
grind
Stuck
valve
-Replace
teness
[Oil consumption
is
excessive]
YES-
[Engine runs erratically]
[Engine backfires]
[Engine knocks]
Plugged oil ring groove
Worn
valve
stems and
valve
Faulty
valve
seat
contact
-Adjust
High oil
level
-Clean
Oil leakage along governor
-Replace
Oil leakage from oil
seal
-Replace
Oil leakage from mounting
-Replace gasket
Oil leakage from drain plug
-Retighten
or
replace gasket
Clogged breather
valve
-Clean
Drain-back hole in tappet -Clean
Incorrect oil viscosity
-Correct
Worn piston rings
Replace
Stuck piston rings
Clean or replace
Worn cylinder bore
Bore or replace
guides
shaft
surface
chamber plugged
Replace
Carb.
not properly adjust-
or adjust
Spark plug fould, pitted,
-Clean
Restricted
gas
tank vent
Carb. body and throttle
or replace
Carb. flange leaking
at
gas-
Governor mulfunctioning
-Adjust
ed
or
gapped incorrectly
ket
shaft warn
Tighten
head gasket.
valve
Stale
fuel
Excessive carbon deposit in Clean
Excessive engine load
Adjust
Engine overheating
See low on power
Faulty control unit
Replace
engine
Change