Countax A25-50HE tractor including 50" IBS cutter deck and powered grass collector The A Series is Countax?s premium range of larger garden tractors. The A25-50HE is Countax?s largest petrol garden tractor. The 726cc Kawasaki engine drives a 127cm (50?) IBS deck and an optional 390 litre Powered Grass Collector. The bigger deck and collector means that this tractor can cut a larger area faster than the smaller C or B Series. Suitable for grounds of three acres or more, the A Series will make short work of mowing lawns, paddocks and orchards.