I'm not a motorcycle mechanic but, my understanding with the VN900 having hydraulic lifters that there was no requirement to perform any maintenance on the valves or valve clearance. A Dealer might be your best source for the "Warranty Answer".
Some of the big Jap cruisers, Yamaha for one are using push rods now (backwards step) to keep the motor shorter for styling reasons but the
VN900 is SOHC. Definitely get clearances checked as recommended
or noise and potential damage are likely.
The 06 Classic has one over head cam per cylinder, with solid cam followers (lifters) and uses shims for adjustment. They do indeed need to be adjusted per the owners manual schedule to allow for cam, follower, and valve stem wear. If not adjusted the clearance will eventually be gone, the valve will not close tightly, the valve will leak, allowing extremely hot compustion gases to blow by, burning the valve or seat or both, to the point they will need to be replaced.
They have hydraulic cam chain tensioners. So thats just the chain. The valves are on their own. You still have to check the tolerances and change out shims. Too bad they couldn't have made it like 250 ninja where it is a matter of lossening a keeper nut and adjusting a screw. Then you don't have to run around looking for shims.
South of the Twin Cities.
Ride the river.
'07 900 Classic "turned LT"
Hard Krome 3" Big Straights (45-8025)
Speedo fixer in back (170)
Fuel Gauge resistor
'00 Vulcan 750 (SOLD)
'73 Honda CL350