I'm looking for some info on my '87 XR600R... 1. Any tricks w/ rebuilding the carb, or just replace gaskets/seals? Should I definitely increase jet size while I'm in there (w/ SuperTrap pipe)? 2. I had no compression due to a carboned-up exhaust valve, and now I've got the head apart for cleaning. Should I just lap the valves, or should I proceed w/ cutting the seats? Any other useful tech info. on this machine is appreciated (first-timer!!!) THANKS!!!