BRIGGS STRATTON INTEK AVS 4-stroke vertical shaft petrol engine for lawn tractor lawnmower mower mower to 21 HP unified flange for all engines snow blower snow blower motor cultivator front wheel drive salt spreader zero turn and other uses TECHNICAL SPECIFICATIONS Shaft Ø x L cylindrical 25.4 x 80 mm Engine type Single cylinder, 4-stroke, air-cooled, OHV Charging system regulator 9 Ah electric start power 21 HP Displacement 540 cc carburettor float Bore x stroke 94. 0 x 77.80 Quantity of oil 1.24-1.30 without filter 1.36-1.40 with filter Dry weight 31 Kg Dimensions L x W x H 479 x 411 x 327 mm oil pump lubrication This engine replaces all pre-2014 versions be they 8-9-10-11-12-13 horsepower, the only difference may be the position of the exhaust (muffler) that is not supplied, the output shaft is 25.4 mm (1 inch) by 80 mm. for more details please contact us. Article code 806839 FOR ALL BRANDS: STIGA CASTELGARDEN MTD ALPINA MOUNTFIELD HUSQVARNA PARTNER MURRAY JONSERED OLEOMAC EFCO SNAPPER VICTA YARD-KING YARD-MAN AGS AL- KO ARIENS AS MOTOR DEA CONCORD ETESIA VIKING WESTWOOD AYP IBEA JOHN DEERE NOMA SIMPLICITY TORO WALKER YAMAHA The warranty is ONLY valid when using SAE 30 lubricating oil, preferably BRIGGS STRATTON, which you can find in our store