2011 KX500AF2011 KX450F frame, 2001 KX500 engine, guy i got it from said its possibly bored to a 540cc, this bike was a no expense spared build, will lift in 5th gear without pulling on bars. Must have cash in hand for test drive, will trade for fuel injected 450 & cash. just looking for something a little more melow. Talk to your wife first and make sure health insurance plan is up to date before messaging me. Might be able to deliver