just get a lawyer to wright a letter for you 1st telling him about how your going to take him to court and he is going to be responsible for paying you other fee's besides the original 400. see if that helps. but if he is a 19 year old punk i'm guessing it wont..
so you bought this motor at this guys house right...
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2011 BMW S1000RR
2008 NINJA ZX-10 - sold
2009 NINJA EX250 - sold
2006 NINJA ZX-14 (wrecked)
2005 NINJA 636 plasma blue - sold
Seductive Cycles