Hello from new Zealand
will the gran sport piston (sold for polini and dr177) work in the DR177 cylinder without any modifications other than a rebore to 4thou clearance?
the dr piston is no good now so I purchased a gran sprot piston which will be stronger
the boost arrangement of the DR is quite different from the GS piston. Dr has the three vertical thin windows.and one horizontal window and also two holes high up on the piston .... the GS just has one window down quite low
will the GS piston work ok in the DR 177 cylinder without any modifications???