I have read horror stories with all brands,and sure any brand on any given day could go down. The valve trane, crank etc,I have to say Yami has the best built motor going (QUALITY WISE).450 and 250 I am not trying to blow sunshine up our asses.I just get frustrated and dumbfounded why a certain brand is more popular than another,because of what a magazine has written.EVEN THOUGH IT DOES FEEL GOOD GOING TO A TRACK AND YOU HAVE THE ONLY YZ THERE. We all know The YZ VALVE TRANE is superior to X brand and all the others,this is a fact:worthy: Just look at the prices for the valves ;EXAMPLE. There are more options for aftermarket valves, cams, springs,for other brands than the YZ,wonder why. Admit it, the most popular brand is a time bomb waiting to go off,I am not just talking about the valves either.You can say "well since there is more of this brand out there,there is a better chance of more bad reports",POPPY COCK It just boggles my mind that consumers who buy bikes do not look at the whole picture,the whole picture is, Junk is being poured into these bikes,but riders just keep on buying them . Sales for parts are probably at a ALL TIME HIGH. You see, if people just go on being sheep the quality keeps on suffering. If people finally caught on and the numbers dropped on sales you will see a different tune. There is no doubt in my mind than Yamaha builds a better quality motor from the valve trane down to the crank. I just wanted to rant and keep some of us in check. Maybe the average YZ OWNER has a higher IQ than other brand owners,or am I pushing it.