6T TIGER110 TR6 T120 BONNEVILLE. TRIUMPH 650 PISTONS 1956 - 73 7:1 STANDARD SIZE. PISTON SET FOR 650 TRIUMPH TWINS 71MM. 7.1 compression ratio for any 650 Triumph Twin with an alloy cylinder head. As a rule we try and source our spares from British manufacturers if at all possible and aim to provide a choice between genuine parts and good quality pattern parts.
