Valve clearance check time

[PieEater]

To be honest I've never heard of anyone saying that their valves were out of tolerance when checking. I remember someone replacing some shims just so that the clearances were in the middle of the range but this was because they wanted to rather than needed to. Of course your bike may be the exception but in all honesty I would enjoy the summer and contemplate your options come winter. In preparation it would be good to look for some feeler gauges with a  narrow taper and that are in the upper, lower and middle of the ranges so you don't have to faff around with multiple feelers to get to the size you want.