Since I've heard that the stock jetting is too lean with the baffles removed, I swapped my 168 MJ out for a 172, opened the air screw from 1 1/2 to 2 1/2 (45 PJ), and put on a White Bros. air filter. Now the bottom end is stronger, but the transition to midrange is very smooth. With the prior overly-lean stock MJ, I had a very cool & fun "YZ hit" in the midrange. I'd like to keep the WR timing stock, I like the engine braking on single-tracks, and fuel economy for those long desert rides. Can I get the "hit" back with a needle change? WR timing, 45 PJ (2 1/2 turns out), 172 MJ, no baffles, cut throttle stop, 1-3K feet.