2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 23Get this manual
Features and benefitsTechnical tips Technical tips Fuel injection control
The F225 injects fuel simultaneously to the following cylinder pairs: #1 and #4, #2 and #5, and #3 and #6Optimal injection timing is provided in accordance with the operating conditions of the engineStarting fuel injection volume and injection timing The injectors are actuated in sync with the standard crankshaft position signals (BTDC 70) for cylinder pairs #1 and #4, #2 and #5, and #3 and #6, respectively#6
(Compression TDC)
CYLINDER #1 CYLINDER #2 CYLINDER #3 CYLINDER #4 CYLINDER #5 CYLINDER #6 SIGNAL #14 SIGNAL #25 SIGNAL #36 INJECTION #14 INJECTION #25 INJECTION #36
Compression Combustion Exhaust Intake Compression Expansion Compression Combustion Exhaust Intake Compression Intake Intake Combustion Exhaust Intake Compression Compression Compression Combustion Exhaust Intake Intake Exhaust Combustion Exhaust Intake Compression Combustion Exhaust Combustion Exhaust Intake Compression Combustion Exhaust
B70 B10 B70 B10 B10 B70 B10 B70 B10 B70 B10 B70 B10 B70 B10 B70 B10