02zx9r; not looking to be greedy with the oci's, but I'd like to get at least 1000 miles safely between.
Sunruh, not speed shifting or doing anything unusual with the clutch, although I think I remember that the clutch plates are aluminum in this bike, as they are (stock at least) in the 250F. Could account far quite a bit of Al. I'm using stock yamaha air and oil filters. As far as the 250R being close to the 250F in construction, There are lots of differences. They share only bore and stroke (also shared with the R1 for that matter). The cases are completely different which likely means totally different bottom-end. The "r" has a counter-balancer, totally different head, oil-pressure regulated timing chain tensioner, etc., etc. Not that this little guy couldn't use some 250F mojo... It's down SEVERAL hp... I know, I rode my bro's YZ250F last weekend @ Sand Mountain, NV. It's had some work done on it in the performance dept, but I was like, "Geez! This things' a 250?" Oh well, he's had a couple top ends in it in less mileage than I have on mine now... There is no free lunch, after all. There's Motul 300V 15W50 in it now. I took a second sample of the Rotella I just drained today with the same mileage as the first which I'll send in to help establish a trend/baseline. Then we'll see what $14.00 per liter buys ya. Thanks for the input, all!