XR600 Carb. and Valve lapping info.

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!!!

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