Plug out, put bike in top gear (5th?), valve covers removed.
Slowly rotate rear wheel in direction of travel, watch the the exhaust & inlet valves compress & extend. Keep rotating the wheel and wait for the inlet to compress and then extend again. At this point, poke a long drinking straw or similar down the plughole and slowly rotate the wheel.
As the piston rises, it pushed the straw upwards - let it slide through your fingers. When the piston reaches TDC, the straw stops moving upwards. You're now at TDC on the compression stroke with all of the valves closed and you can safely check/adjust the valves.
It's not crucial that you're at exact TDC as there's a few degrees leeway either side.
Once done, rotate the engine several times, get the piston at TDC on the compression stroke and waggle the rocker arms to ensure that they have some play in them i.e. they're not tight.
Bearing in mind your recent toilet paper incident, please remember to remove the straw once you've located TDC....
Good luck.
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