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Poor performance of the engine and/or cutting mechanism can normally be prevented by carefully following these
instructions.
Poor performance can easily be corrected even by a beginner.
When the engine does not function properly check the following three (3) points first.
• Is the engine compression adequate?
• Is fuel system in good condition and is enough fuel being supplied?
• Is electrical system in good condition and is spark plug operating normally?
When there is serious trouble with the unit, do not try to repair it yourself but have your distributor or dealer do it for
you. For detailed TROUBLESHOOTING refer to tables 1 and 2. Locate the problem on the following charts and repair
as necessary.
Table 1
Fuel is not
P
o r
b
e l
m
F
E
n
i g
e n
c
a r
k n
- s
s
a t
s t r
a h
/ d r
o d
s e
t ' n
t s
t r a
E
n
i g
e n
r
n u
, s
b
t u
i d
s e
r o
o d
s e
n
t o
c a
e c
e l
a r
e t
p
o r
e p
y l r
E
n
i g
e n
o d
s e
o n
c t
a r
k n
t
RoubleshootinG
E
N
G
N I
E
reaching carburetor
P
C
h
e
k c
Fuel is not reaching
cylinder
No spark at high
e u
a l
c t
r a
u b
e r
r o t
N
f o
e u
tension cord end.
F
e u
a l
c t
i l y
d n
r e
N
f o
e u
M
f f u
r e l
S
a p
k r
a
e t
d n
N
f o
l p
g u
w
e r i
S
a p
k r
t a
l p
g u
N
A
r i
l i f
r e t
A
r i
F
u
l e
l i f
r e t
F
u
F
u
l e
e v
t n
F
e u
v l
S
a p
k r
l P
g u
l P
g u
C
r a
u b
e r
r o t
m I
r p
p o
C
o
i l o
g n
S
s y
e t
m
C
o
i l o
i d
y t r
S
a p
k r
A
r r
s e
r o t
S
a p
S
c
e r
n e
c s
e r
N
A /
R
O
B
L
E
M
T
R
O
U
B
L
E
S
H
O
Make sufficient.
Strainer clogged ..........................................Clean.
Carburetor out of order ................................Disassemble and check.
S
a t
u t
s
C.D.I. module defective ...............................Remove and replace.
Ignition coil defective ...................................Remove and replace.
a l
c t
r a
u b
e r
r o t
F
u
l e
t s
i a r
e n
Wire connection defective ..........................Reconnect.
F
e u
i l l
e n
c
C
r a
u b
e r
r o t
High-tension cord connection defective.......Repair as necessary.
a l
c t
i l y
d n
r e
C
r a
u b
e r
r o t
Switch is grounded ......................................Switch on.
No spark at plug
Insulator cracked .........................................Replace plug.
w
t e
w
h t i
u f
l e
F
u
l e
M
x i
r u t
Fuel does not keep
Spark gap incorrect .....................................Adjust.
running
Covered with carbon....................................Clean or replace.
o
s
a p
k r
t i
h c
t S
p o
s
w
E
e l
t c
c i r
l a
Fouled with fuel ...........................................Clean or replace.
n I
e t
o l r
k c
s
Starting procedures incorrect ......................Start correctly.
Acceleration and low
Low and high speed needle.........................Readjust.
speed function defective
setting too lean
o
s
a p
k r
S
a p
k r
a g
i p
Metering lever spring too strong ..................Readjust.
C
v o
r e
d e
w
Fuel pump diaphragm defective ..................Replace.
F
o
l u
d e
w
h t i
Fuel passage clogged with dust ..................Disassemble and clean.
l P
g u
e d
e f
i t c
Fuel leaking from fixing surfaces ................Retighten all screws.
of carburetor
l i f
r e t
i d
y t r
N
o
m r
l a
w
e
Air valve, fuel tank cap does not
Carburetor
work normally ..............................................Replace or Clean.
l e
l i f
r e t
i d
y t r
C
n o
a t
m
n i
n a
overflow
Fuel pump does not operate........................Check
Engine does
u f
l e
impulse drilling.
Fuel inlet needle valve clogged with dust ....Clean.
n e
p t
u l
g g
d e
C
n o
a t
m
n i
n a
u f
l e
Metering lever spring not placed
not crank
in dent of lever .............................................Correct.
i d
y t r
w /
o
n r
N
o
m r
l a
w
e
Fuel strainer
Muffler sticky with fuel .................................Fuel mixture is too rich
clogged ..........
Clean.
r e
a
j d
s u
m t
e
t n
V
r b i
i t a
n o
times
Fuel pipe
and
g n
s
s y
e t
m
E
x
e t
d n
d e
clogged ............
p /
u l
g g
d e
i d
y t r
d /
s u
y t
Clean.
Bearing damaged ........................................Disassemble and
k r
a
r r
s e
r o t
N
o
m r
l a
w
e
replace.
n e
p
u l
g g
d e
Piston and/or cylinder seized.......................Disassemble and replace.
N
A /
n I
e t
n r
l a
n e
Crankshaft worn ..........................................Disassemble and replace.
Crankshaft contacting crankcase ................Disassemble and replace.
Suction insuf-
ficient ................
24
O
T
N I
G
C
H
A
R
T
C
a
u
e s
c r
o l
g g
d e
C
e l
n a
o
r r
o l
g g
d e
C
e l
n a
o
r r
S
e e
o y
r u
S
e e
o y
r u
t e
o o
i r
h c
O
p
n e
c
o h
l C
a e
r / n
p e
A
j d
s u
c t
S
e e
o y
r u
f f o
u T
n r
s
w
t i
r p
b o
e l
m
S
e e
o y
r u
w
t i
h c
S
e e
o y
r u
c n
r o
e r
t c
A
j d
s u
t t
. o
h t i
a c
b r
n o
C
e l
n a
o
r r
u f
l e
C
e l
n a
o
r r
e v
R
p e
a l
e c
r a
C
e l
n a
o
r r
s t
e r /
i s
u d
s e
n i
R
p e
a l
e c
s t
e r /
i s
u d
s e
n i
C
e l
n a
o
r r
r a
C
e l
n a
a
d n
A
d
u j
t s
p o
r e
i t a
n o
n i
C
e l
n a
o l
a c
o i t
s n
r a
R
p e
a l
e c
i g
e n
r p
b o
e l
m
S
e e
o y
r u
R
e
m
e
d
y
p e
a l
e c
p e
a l
e c
E
c
o h
d
a e
r e l
E
c
o h
d
a e
r e l
e k
a l
e c
r i a
l i f
r e t
r a
u b
e r
r o t
E
c
o h
d
a e
r e l
h c
o t
O
N
E
c
o h
d
a e
r e l
E
c
o h
d
a e
r e l
5 6
m
m
. 0 (
2 0
i 6
) . n
p e
a l
e c
p e
a l
e c
l p
g u
p e
a l
e c
p e
a l
e c
a
j d
s u
o t
r r
p e
a l
e c
Start the engine several
with choke rod fully open
run at fast idle until engine
does not smoke.
E
c
o h
d
a e
r e l
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