Hi, with a cold engine, do the following.
Turn off ignition, fuel and remove seat and tank. Undo the central magneto inspection window and 17mm timing mark bolt on the LHS engine cover. Take out a sparkplug. Remove both valve rocker covers.
Turn motor counter-clockwise (using a socket on the nut at the end of the magneto spline) until the timing mark (T) lines up with the centre of the inspection bolt hole. Check all four rocker arms have a slight amount of free play, if not, rotate engine a further 360o. When all four valve rockers have some play, the piston is at top dead centre of compression stroke when all valves are closed. Your now ready to set the gaps.
Loosen lock nut with a ring spanner and adjust gap with a screwdriver, place feeler gauge under tappet between valve stem. Tighten down screw till moderate pressure is felt when sliding the feeler guage. Tighten lock nut ensuring screw does not tighten with it. Do all four valves and crank motor over a couple of revs by hand and check gaps again.
Gaps are as follows:
Inlet 0.08mm - 0.13mm
Exh. 0.17mm - 0.22mm
Goodluck, cheers!
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