2015 Bad Boy Diesel 6100, Our biggest and baddest Bad Boy could very well be the last mower you’ll ever need. The legendary durability, power and reliability of a Caterpillar® engine, coupled with our incredible build quality and strength, combines to deliver years of day-in, day-out mowing. Everything about this Diesel mower represents power and strength—from the heavy-duty clutch to the over-size hydraulic motors and pumps—and it’s ready for your toughest workload.