I am riding one here in about 5 hours....I will let you know what I think! (right DPW? ) I was waiting...Satuday and Sunday... Anyway I have been riding the YZ450 since Nov. '02 and I liked the four speed alot. I ride just MX tracks. I now have three days of riding on my new 5-speed YZ450 and no complaints or shifting 100 times a lap. I honestly do not even notice it, 5 gear is overdrive! I'm still in third gear most of the time. Congrats on the new KX450F sounds like a great bike!