Yamaha MZ175 Owner's Manual page 52

(Manual starting model)
A ENGINE DOES NOT START
B
Turn the engine switch to "ON", then pull
the recoil starter and check if the oil
warning light flickers.
C Does not flicker
H
Pull the recoil starter and check the
spark plug for spark strength.
(See "WARNING")
WARNING
9 To prevent FIRE HAZARDS be
sure fuel is not present in the
spark plug area.
9 To prevent FIRE HAZARDS be
sure to place the spark plug as
far away as possible from the
spark plug hole and carburetor
area.
9 To prevent ELECTRIC SHOCK do
not hold spark plug lead with
hand while testing.
I OK
N Check the following.
9 Fuel line clogging
9 Air filter element
clogging.
D Flickers
J Does not spark
O Clogged
P OK
– 47 –
E Check engine oil level.
F OK G
Consult a
Yamaha dealer.
K Check the spark plug.
9 Type: BPR4ES
9 Gap: 0.7–0.8 mm (0.028–0.031 in)
L Incorrect M
Replace or Clean the spark
adjust gap. plug.
Q
R
Clean
or
replace.
S Engine does not start.
T Consult a Yamaha dealer.
Level low
Add engine oil.
OK
OK