Hello All, I just got the new 04 YZ450F last weekend, and broke it in as best I could by the book. Heat cycled it, rode for a few laps and parked it, etc. Now, I have about 1.5 hours of ride time on the original oil. Would you change now? I was going to ride at an open track tonight and then change after that, but wanted to get some opinions if I should change first. Thanks!