Just bought a 2011 YZF450 and love it. I am trying to get use to the engine braking. It seems this bike has more engine braking than my 2005 rmz 450. The stock gearing on the yzf is 48 tooth rear. I am thinking that if I change the rear it might help. Can anyone give me advice on what size rear I should change to? 49T,50T,51T, etc.? By the was I am 225lbs. and only ride MX tracks, mostly vet. (I know it would be best to lose 25-30 lbs. for MX however this will not happen anytime soon however i'm working on it.) Thanks for the help.