Year of manufacture/ production: 1989-1993. 4 Stroke, 4 Cylinder. Bore: 3.62 inches (92 mm), Stroke: 3.54 inches (90 mm), Comprestion ratio: 16:1, Displacement : 145.85 Cubic Inches (2.39 Liters), Horse Power: 110-130, Max Engine Speed: 3200-3850 rpm. Test run by T.M. 10-27-15: 60-80 psi oil.Runs great. Shouldnt smoke at all after getting some run time. Engine was used by a college for illustration purposses and was only ran periodicly, than sat inside. Selling as is.