ABNORMAL
COMBUSTION
backfire 
afterflfe
run 
on 
etc
Improper 
ignition 
timing
Fuel
system 
in 
trouble
Defective
cylinder 
head
etc
EXCESSIVE 
OIL
CONSUMPTION
Oil
leakage
Excessive 
oil
consumption 
ENGINE
Improper 
ignition 
timing
Improper 
heat
range 
of
the
spark 
plugs
Damaged 
carburetor 
or 
manifold
gasket
backfire 
afterflre
Defective 
carburetor
jet
Improper 
function 
of 
the 
float
Uneven
idling
Improperly 
adjusted 
valve 
clearance
Excess 
carbon 
in 
the 
combustion 
chamber
Damaged 
valve
spring 
backfire 
afterure
Loose 
oil 
drain
plug
Loose
or
damaged 
oil
pan 
gasket
Loose 
or
damaged 
chain 
cover
gasket
Defective 
oil 
seals 
in 
front 
and
rear 
of 
the
crankshaft
Loose 
or
damaged 
locker
cover 
gasket
Improper 
tightening 
of 
oil 
filter
Loose 
or
damaged 
oil
pressure 
switch
Worn
cylinder 
and
piston
Improper 
location 
of 
the
ring 
split 
or 
reo
versed
assembly
ET 
32 
Adjust 
the
ignition 
timing
Use
specified 
spark 
plugs
Replace 
them 
with 
new 
ones
Disassemble 
the 
carburetor 
and
check
it
Adjust 
the 
level 
and
check 
the 
needle
valve
Adjust
Readjust
Remove 
the
cylinder 
head 
and
remove
carbon
Replace 
it 
with
a 
new 
one
Tighten 
it
Renew 
the
gasket 
or
tighten 
it
Renew 
the
gasket 
or
tighten 
it
Renew 
the 
oil
seals
Renew 
the
gasket 
or
tighten 
it
Do 
not
tighten 
excessively
Renew 
the
gasket 
and
tighten 
it 
cor
rectly
Retighten 
or 
renew
the 
oil
pressure
switch
Overhaul 
the
cylinder 
and 
renew 
the
piston
Reassemble 
the
piston 
rings 
correctly