I've been looking for a nice used bike the past couple of months. I've been told by almost every mechanic and rider I've spoken with to avoid Honda CRF's due to valves being a real PITA to deal with. I know, all bikes need vales checked or replaced when it's time, but is there any truth to the comments about Honda CRF250 Thumpers having more valve problems/issues that say a Yamaha WR ? I'm not married to any brand, and after looking all over the place I see Honda CRF's for sale ten to one more often than WR250F's. I know, Honda sells a lot of bikes, but, Yamaha does too. If the valve issues are legit, which years should be avoided when looking for a used CRF250 ? I see more 2005 and 2006 models than any others, but I'm not sure if the valves are part of the reason for this.