I just got your 2004 lazer catalogue in the mail and I have a few questions for you I currently have a kohler 27 hp 60 and the speed is said to be 10 miles per hour. I am leaning towards the 28 hp EFI and the book says the same 10 miles per hour. So how come the 27 hp diesel is rated at 12 miles per hour? Were talking about identical and even higher hp so why are two 27 hp models so different? Aside from the extra 400 pounds the diesel is carrying around the only real difference I saw was the back tires are said to be 26 inches instead of the 24 inches on the other models is that extra 2 inches where the speed is coming from? It obviously isnt coming from being light the thing weighs 1600 pounds empty no rider no fuel no bagging system.