The Craftsman Exclusive 725ex Platinum Series™ engines provide easier starting, more durability, and lower emissions. These engines provide the power needed for high-performance mowing. Featuring Smooth Start™ (Craftsman Exclusive) – Two advanced engine features combine to give you an easier starting engine the Most Reliable Starting (MRS) Spark Plug and the Advanced Ignition Coil. ReadyStart® – No priming. No choking. Just pull for power.