This particular sound which you mentioned is the teppet sound and it is present in most fzs. And it is coz yamaha has kept the teppets bit on the lose side considering our hot climate. Also the valve clearance could be the issue with the test bike you rode.
Most test bikes are in crappy condition irrespective of make.
Ride an Enfield to enjoy the teppet sound then you would stop hearing that in the fz pun intended.



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