I was trying this dudes drz400 today and he was riding my 2006 xr650r....drz is a cute lil bike...nothin next to the XRR though!!!! He blew past me on my bike while I was doing about 30mph on his…so he was doing about 60mph(?)…anyway, when he came off the throttle at pretty high rpm there was a “pop” and a puff of smoke came out of my tail pipe. For the rest of the ride he kept it "pretty" mellow and I didn’t see any smoke coming out of my tailpipe… I just did the side panel airbox mod and its running pretty lean (not dangerously though)… Like I said it’s a 2006 uncorked xr650r with about 10,000+ miles on it…I have a FMF Ti4 can on it… also, I ride it on the road a lot and beat the piss out of it.... I really don’t notice any oil consumption. So is this something to worry about? Or is it normal? The motor still feels hella strong…I just don’t like seeing smoke coming out of my ass. Thanks.