Valve spring heat insulating washers for all A7/A10 series

Reduces settling in exhaust valve springs as compared to inlet valve springs.  For BSA A7 series and A10 series.  Special high temperature Tufnol composite with working temperature up to 300ºC as against normal Tufnols with maximum working temperature of 125ºC.  Use under exhaust valve spring cups.  Particularly beneficial on iron head models, as heads on these bikes can easily attain 160ºC.  1mm thick.  If needed, it is advisable to thin down underside of valve spring retaining cup to preserve valve spring installed length. Price is for one washer.

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