Is anyone using this flywheel? I see lots of recommendations from gray and others recommending the heavier 9.21 oz GYTR flywheel, but no comments on the lighter one. I'm looking for a modest increase in flywheel over the stock, not a trials bike. A friend of mine has Steahly's lighest (7 oz.) flywheel on his YZ250F - and that amount of increase is about right. Not sure how the GYTR flywheels compare to the Steahly though.