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Yamaha 200A Service Manual Page 11

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60L3D1X
6
Technical tips
1
Fuel injection control
The F200 injects fuel simultaneously to the following cylinder pairs: #1 and #4, #2 and #5, and #3
and #6. Optimal injection timing is provided in accordance with the operating conditions of the
engine.
Starting fuel injection volume and injection timing
The injectors are actuated in sync with the standard crankshaft position signals (BTDC 70°) for cyl-
inder pairs #1 and #4, #2 and #5, and #3 and #6, respectively.
Normal fuel injection volume and injection timing
To control the actuation timing of the injectors, the injection ending timing is established by using the
top-dead-center of the intake stroke as the standard, for cylinder pairs #1 and #4, #2 and #5, and #3
and #6, respectively.
#6
B70
#1 #2 #3 #4 #5 #6 #1 #2
CYLINDER #1
CYLINDER #2
CYLINDER #3
CYLINDER #4
CYLINDER #5
CYLINDER #6
SIGNAL #1/4
SIGNAL #2/5
SIGNAL #3/6
INJECTION #1/4
INJECTION #2/5
INJECTION #3/6
B10 B70 B10
B70 B10
B70 B10
B70 B10B10 B70 B10
B70 B10
B70 B10
(Compression TDC)
Compression Combustion Exhaust Intake Compression Expansion
Compression Combustion Exhaust Intake Compression
Intake
Compression
Combustion Exhaust Intake Compression
Compression Combustion Exhaust
Intake
Compression Combustion Exhaust
Compression Combustion Exhaust
Intake
Intake
Intake
Intake
Combustion Exhaust
Exhaust
Combustion Exhaust
Starting injection start timing
(standard position BTDC 70
˚)
S60L1200
#6
B70
#1 #2 #3 #4
#5 #6 #1 #2
CYLINDER #1
CYLINDER #2
CYLINDER #3
CYLINDER #4
CYLINDER #5
CYLINDER #6
SIGNAL #1/4
SIGNAL #2/5
SIGNAL #3/6
INJECTION #1/4
INJECTION #2/5
INJECTION #3/6
B10 B70 B10
B70 B10B70 B10
B70 B10
B10 B70 B10
B70 B10
B70 B10
Compression Combustion Exhaust Intake Compression Expansion
Compression Combustion Exhaust Intake Compression
Intake
Compression
Combustion Exhaust Intake Compression
Compression Combustion Exhaust Intake
Compression Combustion Exhaust
Compression Combustion Exhaust
Intake
Intake
Intake
Intake
Combustion Exhaust
Exhaust
Combustion Exhaust
(Compression TDC)
Synchronous injection completion timing
#1/4 synchronous injection start/completion
timing setting range
S60L1210
Features and benefits / Technical tips
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