i was thinking about buying a yz426f.My buddy just bought a Yz250 today. We both have the same rider talent,me maybe a little faster. I would be stepping up from a CR125.I Cant afford a 450,but I want a new 4stroke motocrosser. Is the Yz426F a good choice? Is it faster than a 250 2 smoke? Or do you need some mods on it?