Engine 4-stroke twin-cylinder 627cc OHV 23 HP for lawn tractor lawn mower mower motor cultivator professional machines bio-shredder BRIGGS STRATTON VANGUARD HORIZONTAL SHAFT FEATURES: Number of cylinders : 2 Maximum power : 23 Hp Displacement : 627 cc Shaft dimensions : 25 x 80 mm Oil tank : 2,0 L Cooling system : air The warranty is valid ONLY when using SAE 30 lubricating oil preferably BRIGGS STRATTON which you can find in our EM store