This is from my '83 Honda Shop Manual for my 500. I'm not sure if any of the clearance values are exactly the same for the '86, but they're probably very close.
Hope this helps,
Note: Inspect and adjust valve clearance while the engine is cold (Below 35deg C/ 95deg F
Remove the frame side covers and the seat.
Turn the fuel valve OFF, disconnect the fuel line and remove the tank (page 4-14)
Remove the timing cap from the right crankcase cover.
Remove the valve adjusting hole covers and caps.
For front valve clearance adjustment, rotate the crankshaft clockwise to align the "FT" mark with the index mark.
for rear valve clearance adjustment, rotate crankshaft clockwise to align the "RT" mark with the index mark.
Make sure the piston is at TDC on the compression stroke; rocker arms should be loose.
Check the clearance of both valves by inserting a feeler gauge between the adjusting screw and valve stem.
INTAKE: 0.10mm (0.004in)
EXHAUST: 0.10mm (0.004in)
Adjust by loosening the lock nut and turning the adjusting screw until there is a slight drag on the feeler gauge. Hold the adjusting screw and tighten the lock nut.
TORQUE: 20-25 N-m
(2.0-2.5 kg-m, 14-18 ft-lb)
for intake bulb clearance adjustment, use the two feeler gauge and adjust intake bulbs clearance at the same time
Recheck the valve clearance.
Install the removed parts in the reverse order of disassembly."