I am at this very stage with my recently acquired VFR800 VTEC. I did all the necessary things to get it running and riding nicely (fork seals, brake rebuild, new spark plugs and camchain tensioners, fixing stuck starter valves and synchronising properly and a major clean) and have covered about 8000km since, but I put off the BIG job namely checking the valve clearances. The VTEC system is a giant PITA to work on as you need to remove the cams and buckets to install stopper pins, then put it all back together (including camchains and cam caps torqued JUST so you can measure the clearances. I'm glad I don't need this bike as primary transport as I found 6 of 8 VTEC valves woefully short on clearance, and am now waiting on the new cam buckets to be shipped from Japan so I can reassemble it. I suspect all the POs have simply checked the non-VTEC valves and reshimmed those as needed, but once I checked the other valves there is no way I'd feel good about riding it until they are corrected.