Originally Posted by Foot dragger
37 HP is about 12 high for a really good running KDX,even with a pipe/porting/head mods 25hp would be pushing it.
Im pretty sure 18/20 hp is what they have stock. They arent fast but make great little woods bikes,just gotta buzz em and row the gears to make em move well.
A KTM200 might approach 35 hp at max buzz and weighs less and less the newer it is.
Google KDX info and some kind of power output will pop up somewhere.
Here are some old dyno (2000 vintage) curves comparing the two; but probably no longer true today with the newer KTM engines. Both show HP in the 35 range.
2005 XR650R - plated
2003 KDX220 - plated
2003 KX250 - plated
AtomicXRer screwed with this post 09-23-2012 at 10:09 AM