SE416 Yamaha V6 2.6 Liter 2 Stroke 90&deg; Gearcase 1.86 Gear Ratio 25" Driveshaft Our SE416 replaces most Yamaha V6 90 Degree Standard Rotation 2 stroke lower units. Our SE416 and SE418 will not work on any 250 HP 4 stroke engines. Replaces OE #: 64D-45300-21-8D