Yamaha MAJESTY YP250, Service Manual

Page: 63 / 267

3-13
SPARK PLUG INSPECTION/
IGNITION TIMING CHECK
INSP
ADJ
18 Nm (1.8 m
S
kg)
NOTE:
NOTE:
*****************************************************
*****************************************************
Spark plug gap:
0.6 0.7 mm
6. Install:
D
Spark plug
Before installing a spark plug, clean the gasket
surface and plug surface.
YP303052
IGNITION TIMING CHECK
Prior to checking the ignition timing, check all
electrical connections related to the ignition
system. Make sure all connections are tight and
free of corrosion and that all ground connec-
tions are tight.
1. Remove:
D
Timing check plug
2. Attach:
D
Timing light 1
Engine tachometer 2
(to the spark plug lead)
Timing light:
90890-03141
Engine tachometer:
90890-03113
3. Check:
D
Ignition timing
Checking steps:
D
Start the engine and let it warm up for several
minutes. Let the engine run at the specified
speed.
Engine idling speed:
1,450 1,550 r / min
D
Visually check the stationary pointer
a
to
verify it is within the required firing range b
indicated on the flywheel.
Incorrect firing range
Check the ignition
system.