I just changed the cam timing to YZ spec last night. Went for a quick ride and the throttle response is still very "WR like" in low to mid rpm's. I suspect the stock DRR needle is the culprit. I ordered the YZ EJP needle and vortex ignition today. I'm going to use a 168 M.J. since the stock M.A.J. is a 200. I'm not sure if I should use a 45 P.J. since the stock P.A.J. is a 75, or should I use a 48 P.J. and switch to a 100 P.A.J. Would appreciate it if anyone knows which combination is better with the EJP needle.