Went to do the valve clearance check on my 1994 Suzuki Katana 600 and was dismayed to find that I have zero clearance on any of the valves... Even my thinnest feeler gauge won't slip between and it visibly looks like hard contact. 16,000 miles on it and as far as I know this has never been checked.
Is this engine a lost cause? Or, can I attempt thinner shims and see if I can get some clearance?