Yamaha YW50AP Service Manual page 201

YP.....
TROUBLESHOOTING
Procedure
Check:
1. Lighting coil resistance
2. Auto choke unit resistance
3. Wiring connection (entire auto choke system)
NOTE:
8 Remove the following parts before troubleshooting.
1. Battery box cover
2. Rear carrier
3. Tail cover
4. Right side cover
8 Use the special tools specified in the troubleshooting section.
Pocket tester:
YU-03112
1. Lighting coil resistance
8 Disconnect the CDI magneto couple from
wire harness.
8 Connect the pocket tester (Ω x1) to the
lighting coil coupler
Tester (+) Lead→Yellow/Red 1 terminal
Tester (-) Lead→Frame earth
2 C.D.I. magneto
8 Check the lighting coil for specificated re-
sistance
Lighting coil resistance
0.4~0.6 Ω 20°C (68°F)
IF THE AUTO CHOKE FAILS TO OPERATE.
W
CDI
Magneto
Y/R
1
MEETS
SPECIFICATION
*
AUTO CHOKE SYSTEM
OUT OF SPECIFICATION
Replace the lighting coil
7-43
– +
ELEC