my son has had a 2000 rm 80, 2001 cr125, 2002 yz250f,2003 yz250f,2005 250f,2006 yz 450f2007 yz250,2008yz250f,2008 450f,2010 rmz450,2011ktm350,2011 crf450, 2012 crf250, 2012crf 450. that has cost us about $2000. a bike.a year. have never had any mechanical problems. is my opinion that this is...