The last couple of rides my DRZ has given what I would call a couple heavy coughes at high rpm, it's never done this before so I was thinking maybe crappy fuel?
Well being that I was going to change the fire cork, I figured I'd check the valves too, on the exhaust valves I got .006 on one and .011 other, intake .006 and .008, I don't really think this would cause the coughing and I know someone will say "check TT" just want to run it by you guys first
check the vacuum petcock.... if it starts happening more, turn the fuel to prime as to bypass the vacuum switch and have it always on.
Also check the kickstand kill switch... those have been known to vibrate and cut the motor.
What are specs spost to be on the valves? i wouldnt worry too much above loose valves (one or two notches out of the loose side of a spec) especially on the exhaust side.... but i would have concern for the valves that are tight and watch them closely.