Re: Aq125 is marine version of what auto motor
Aq120, AQ125 and AQ140 = B21
AQ145 and a few others = B23
Pretty much the same engine, but just to be accurate!
Here are the specs, the main difference between the B21 and B23 is the bore!
Stroke: 80 mm (3.150 inches)
B19 bore: 88.9 mm (3,500 inches)
B21 bore: 92 mm (3.622 inches)
B23 bore: 96 mm (3.780 inches)
Con-rod length (c to c): 145 mm (5.709 inches)
Crankshaft main journal diameter: 63.45 mm (2.498 inches)
Con-rod's bearing's journal diameter: 54 mm (2.126 inches)
Wrist pin diameter: 24 mm (0.945 inches)
Piston height:
B19A: 46 mm
B19E: (->1983) 46 mm
B19E: (1984->) 46.7 mm
B19ET: 46 mm
B19K: 46.7 mm
B21A Europe: 46.7 mm
B21A: 46 mm
B21E: 46 mm
B21ET: 46.5 mm
B23A: 46.4 mm
B23E: 46.4 mm
Firing order: 1-3-4-2
