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Progress today of sorts, first I addressed the slightly tight opening shim on the exhaust valve, more figure of eight patterns on 600 wet and dry. That is as good as it is going to get, right on the 0.10mm specified minimum clearance.
Next I moved to the inlet valve, rebuilding it with the original shims which were 0.1mm + out on the opening and closing clearances. Selecting the best shim I had for the opening clearance I needed to remove 0.04mm from the chosen shim. I did not mess about with 600 grade this time but got 0.03 off with 180 grit then polished it with 600 grade for the last 0.01mm. This took about an hour and a half.
On the closing shim I had one that gave a clearance of 0.06mm, i.e 0.01 too large, if I wanted to put the clearance at 0.04 (the mid-point in the specified clearance) I would need to reduce my next nearest available shim by ) 0.07mm. I think I will live with a closing clearance out by 0.01mm on both vertical cylinder valves. The bike was running well before with the clearances at around 0.1mm.
The new black cylinder/head studs have been ordered from those nice people at Moto Rapido (Craig) with 10% UKMOC discount at c £96 including VAT for 8.
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