I understand that the 2003 has an improved engine delivering more horsepower and torque.Does anyone know what the changes are and if they can be reasonably added to a 2001 500 auto? And if they can't what other mods can I do to get more power from this dog.

 

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Just gettin' it back to the top, I'm intrested too.[img]i/expressions/face-icon-small-confused.gif[/img]

 

Yes they can be added to any 500 Cat or Suzuki. They consist of higher compression piston, better flowing head, enhanced ignition timing and bigger carb. I would think it to cost around $1200 or so. The better way to go would be the 581 big bore kit from Four Stroke Tech, but would still have to get the carb.