I managed to wear out a front sprocket in +/- 600km. This seems very excessive even though I like caning the bike - 05 WR450.
This sprocket looks to have the same wear as the set I replaced. The inside, motor side of the sprocket is very deeply worn, while the outside looks fine. I checked to see if there are any shim washers in the manual, but see none. ( In case the rear is slightly offset. )
I also replaced the chain adjuster blocks after the last chain set. The chain looks straight when fitted.
p.s. I should have taken photos, I know