Checking The Spark Plugs - Yamaha FT50C Service Manual

CHK
ADJ
Valve clearance:
Intake d:
0.20 ± 0.05 mm (0.008 ± 0.002 in)
Exhaust e:
0.30 ± 0.05 mm (0.012 ± 0.002 in)
7. Loosen the locknut 4, and then turn the
adjusting screw 5 until the specified
valve clearance is obtained.
NOTE:
• To decrease the valve clearance, turn the
adjusting screw clockwise.
• To increase the valve clearance, turn the
adjusting screw counterclockwise.
8. Tighten the locknut, and then check the
valve clearances. Adjust if necessary.
9. Install the cylinder head cover, fuel
pump, and spark plugs.
10. Connect the blowby hose and high-ten-
sion cords, and then install the flywheel
magnet cover.

Checking the spark plugs

1. Disconnect the high-tension cords, and
then remove the spark plugs.
2. Clean the electrodes 1 with a spark plug
cleaner or wire brush. Replace the spark
plug if necessary.
3-7
Periodic checks and adjustments
3. Check the electrodes for erosion and
excessive carbon or other deposits, and
the gasket for damage. Replace the
spark plug if necessary.
4. Check the spark plug gap a. Adjust if out
of specification.
Specified spark plug:
DPR6EA-9 (NGK)
Spark plug gap a: 0.9 mm (0.035 in)
5. Install the spark plug, tighten it finger
tight b, then to the specified torque with
a spark plug wrench c.
Spark plug:
18 N·m (1.8 kgf·m, 13 ft·lb)
62Y5A11