Now that I have a 2nd bike (NC700XD) my NT doesn't get ridden as much. Checking my records I found that I last checked the valves on July 2017 with the odometer at 61k miles. Now 4 yrs, 2 months later and the odometer reads 78k miles. My NC was bought in late-2015 used with less than 1000 miles on it and it now has 36k miles. 
The removal of plastic and other stuff went quickly and I organized all the fasteners on a baking tray keeping them in separate piles to help speed reassembly. I was done in around 4+ hours, start to finish, and I only found one exhaust valve slightly loose but still inside the +/- tolerance range so I left it as-is.
Although it's somewhat backwards to do the rear cyl first and contrary to the service manual sequence, I always to the rear first because removing that rear cover is so easy. Once I was done I removed the throttle bodies, then the front cover with the crank was still in "TR" position for adjusting the rear cyl. What I found was that with the crank in that position, the exhaust rockers for the front cyl were DOWN so it made removing the front cover much, much easier! Previously I'd had always turned the crank to "TF" first which put the ex rockers UP and made cover removal a situation that filled my garage air with cuss words!
While I had everything apart and before I started reassembly, I disconnected, cleaned and lubed all the critical connectors which included the Throttle Position Sensor.
When the NT was new, one thing that bugged me about this job was loosening/tightening the screw for the clamp that holds the front throttle body to the cyl head. The rear clamp screw is in plain view but the front clamp screw is buried in a maze of wires and hoses. There was so much friction from using a long extension that rubbed on the hoses that I never knew if I was turning the screw! I solved this long ago by making a much longer than normal screw and spacer for that clamp so now it's an easy job because I can see the screw head.
The removal of plastic and other stuff went quickly and I organized all the fasteners on a baking tray keeping them in separate piles to help speed reassembly. I was done in around 4+ hours, start to finish, and I only found one exhaust valve slightly loose but still inside the +/- tolerance range so I left it as-is.
Although it's somewhat backwards to do the rear cyl first and contrary to the service manual sequence, I always to the rear first because removing that rear cover is so easy. Once I was done I removed the throttle bodies, then the front cover with the crank was still in "TR" position for adjusting the rear cyl. What I found was that with the crank in that position, the exhaust rockers for the front cyl were DOWN so it made removing the front cover much, much easier! Previously I'd had always turned the crank to "TF" first which put the ex rockers UP and made cover removal a situation that filled my garage air with cuss words!
While I had everything apart and before I started reassembly, I disconnected, cleaned and lubed all the critical connectors which included the Throttle Position Sensor.
When the NT was new, one thing that bugged me about this job was loosening/tightening the screw for the clamp that holds the front throttle body to the cyl head. The rear clamp screw is in plain view but the front clamp screw is buried in a maze of wires and hoses. There was so much friction from using a long extension that rubbed on the hoses that I never knew if I was turning the screw! I solved this long ago by making a much longer than normal screw and spacer for that clamp so now it's an easy job because I can see the screw head.
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