Anyone own a Yamaha Four Stroke?

[Gobes32]

Thanks guys. I was really worried about the valve aspect. The reason i am buying a 426 is due to the fact they represent good value and i really want a four stroke. I am riding track only because my brother is 13 and just received a KX 85. So until he is older and licensed then we are stuck to the motocross tracks. When i do buy the bike i am going to be very vigilant on the maintenance and it won't be revved very hard while i own it. :