I've just spent the last several hours today, scouring through posts on this board. Either you guys are obsessed with your bike maintenance, or I made the WRONG decision to leave my trusty old 2000 CR250 for my new CRF450. I cannot believe I have to check/adjust valve clearances and change the oil every 2 freaking rides? that is insane. 20 hours is about 2 months of riding for me.