I was doing some bike maintenance and needed a new rear sprocket. I found a few on the shelf in the shed I got from RMMC on sale last year. The down side was that they are 47's and I've been running the stock 50's on my rm. I threw one on just because I'm not racing lately and wasn't concerned about all out acceleration.
At the track this morning I was surprised at how well it hooked up! Acceleration like a beefy 250f. I could hold a gear longer and twist the throttle harder without any loss of control. And the suspension felt more forgiving over accel bumps coming out of turns. I found myself launching further over jumps too. I had been concerned about a loss of torque but I actually felt more due to the increased grip.
I have a very fast buddy, rides and often wins the expert vet classes, that regularly runs -3 teeth in the rear and for gp's will even go up one tooth in the front on his yz250. I had been a doubter of his setup, but now .....?
I probably won't go to his extreme gearing, but I'm gonna stick with the -3 on the rear, at least for the 3 RMA sprockets I have left..