Yamaha F50D Servise Manual page 44

TECH
FEA
Starting control
When starting the engine, the timing is set to BTDC 5° until the crankshaft speed maintains 600
r/min for 2 seconds or longer.
9
1 Cylinder identification protrusion
2 Protrusion for cylinders #1 and #4
3 Pulser coil
4 Protrusion for cylinders #2 and #3
5 Pulser coil signal
6 Cylinder identification signal
Warm-up control
After the starting control is completed, the control transfers to the ignition timing based on the warm-
up map for 3 minutes. From the time the 3 minute warm-up control has been completed, the control
transfers to the normal map.
a
a Ignition timing (BTDC°)
b Engine speed (× 1000 r/min)
1 Warm-up map
2 Acceleration map
3 Normal map
2-5
Technical features and description
2
1
5
7
6
1
2
3
5
0
1 2
3
4
8
7 Starting signal (5° BTDC) for cylinders #1
and #4
8 Starting signal (5° BTDC) for cylinders #2
and #3
9 Rotating direction
3 4
b
5 6