Checking The Ignition Timing - Yamaha YFM50S Service Manual

CHECKING THE IGNITION TIMING

EBS00058
CHECKING THE IGNITION TIMING
NOTE:
_
Engine idling speed and throttle cable free play
should be adjusted properly before checking
the ignition timing.
1. Remove:
2. Attach:
3. Check:
M
a. Warm up the engine and keep it at the
b. Visually check the stationary pointer 1 to
L
4. Detach:
5. Install:
3 - 14
• C.D.I. magneto cover
Refer to "C.D.I. MAGNETO" in chapter 4.
• engine tachometer
• timing light
(to spark plug lead)
Inductive self-powered tachome-
ter
P/N. YU-8036-B
Engine tachometer
P/N. 90890-03113
Timing light
P/N. YM-33277-A, 90890-03141
• ignition timing
MMM M MMM M M MMM M M MMM M
specified speed.
Engine speed
1,750 ~ 1,850 r/min
verify it is within the required firing range 2
indicated on the rotor.
Incorrect firing range → Check the pickup
coil.
LLL L LLL L L LLL L L LLL L
• timing light
• engine tachometer
• C.D.I. magneto cover
Refer to "C.D.I. MAGNETO" in chapter 4.
CHK
ADJ
M MMM M M MMM M MMM
L LLL L L LLL L LLL