Engine; Spark Plug; Fuel Line; Over Flow Chamber - Yamaha YT175J 1982 Service Manual

ENGINE
Spark plug
1. Check electrode condition and wear, in-
sulator color, and electrode gap.
2. Clean the spark plug with spark plug
cleaner if necessary. Use a wire gauge
to adjust the plug gap to the specifica-
tion.
3. If the electrode becomes too worn
,
replace the spark plug.
4. When installing the plug, always clean
the gasket surface, wipe off any grime
that might be rresent on the surface of
the spark plug, and torque the spark
plug properly.
Standard spark plug: NGK BP7ES
Spark plug gap:
0.7 - 0.8 mm (0.028 - 0.031 in)
Spark plug tightening torque:
20Nm(2.0m·kg,14.5ft·lb)
Fuel line
Check the fuel hoses and vacuum lines for
cracks or damage; replace if necessary.
Over flow chamber
If gasoline begin to show up in the pipe
I I
A" ,
loosen the three screws from over flow
chamber and completely drain gasoline from
the pipe
I I
A"
and chamber.
Idle speed
1. Turn the pilot air screw until it lightly
seats, then back it out to specification.
This adjustment can be made with
engine stopped.
2-3
Air screw (Turns out): 1 and 1/4
2. Start the engine and let it warm up.
3. Throttle stop screw
Turn throttle stop screw in or out to
achieve smooth engine operation at
specified idle speed.
Idling speed: 1,600 ± 50 r/min
NOTE: ______________________ __
The pilot air and throttle stop screws are
separate adjustments but they must be ad-
justed at the same time to achieve optimum
operating condition at engine idle speeds.
1. Throttle stop screw
2.
Pilot air screw
Throttle cable
Loosen cable adjuster lock nut (at top of car-
buretor) and turn cable adjuster until
specified free play is obtained. Retighten lock
nut.
Free play: 1 -1.5 mm (0.04 - 0.06 in)
1. Adjuster
2. Lock nut