my friend just got a 07 yz450f races bike sweet bike but as we found out there's 1 problem he cant ride it. 2 years ago he found out he has M.S he has all ways had bikes and wanted to get out and ride. so he got this bike so i took him out to ride it he made it 50 foot before tipping over. he has no balance and cant stop and hold the bike up so he spent the rest of the day on my banshee with a broken bone in his hand. so we are selling the bike for $3500 obo or for trade for a 450 quad of equal value