903cc valve adjustment

tomnj

Old fogie stogie
After my 850 903 engine overheated for a couple of minutes (due to a freeze out plug popping out while driving because the PO never put antifreeze in the radiator, long story) I noticed it's idling a little rough now with a "valve tap" noise, which I didn't hear before. It's not misfiring, just not running smooth. I suspect the valves need adjustment now.

I have a shop manual (not a very good one), but does anyone have a simple procedure for valve adjustment or can point me to a video or page showing how it's done? Do you adjust with the engine cold? How do you get the engine to TDC?
 
Thanks! For the 903cc engine it is 0.15mm for the Inlet and 0.2mm for the Exhaust, according to what I read
 
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