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With regards to adjustable pulleys; I bought a set for the Monster and took the engine to Nelly at Cornerspeed to set them up properly but it didn't require them as the standard pulleys had the timing spot on anyway so I didn't use them as I felt that it was just something that could go wrong whilst giving no benefit - that said it looks like your pulleys are alloy so lighter whereas mine were steel and so no weight saving to be made.
IMHO it's worth checking the timing with fixed pulleys as you could be in the same situation as mine?
I did change the timing on the 916 (using offset woodruff keys) but mainly because of the head skim changing timing but also, on a 4v there is more chance of them being out and more benefit to be had by altering as the intake and exhaust can be done individually (separate camshafts) whereas the 2v you can only adjust the overall timing.
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M900, 916, LeMans II.
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