I have a freind just getting into riding. The problem is he can get an 03 crf 450 0r 03 yzf 450. He asked me my opinion and of course I want to see him get the yz but I'm not sure he can handle it. I have told him about the crf valve problems and the bike he is looking at has the kibble white valve and spring kit in it. So, what should he buy, he is a new rider about 6 foot tall and 235 lbs. I love my yz and prefer it over the crf 8 days a week, but with the "smoother power delivery" of the crf and how "easy it is to ride" should I recommend the crf or yzf? Please help.