AJS. Matchless. Burman. Kickstart Ratchet early pre-1937 NOS OD: 1 3/32" = 27,4 mm Thick: 9/16" = 11 mm ID large: 19/32" = 14,9 mm ID small: 1/2" = 12,8 mm
AJS/Matchless Pistons Twin 1956- Mod. 20. G9.Clubman STD /Pair STD = 66 mm Piston Clearence 0.12mm or 45thou incl. Gudgeon Pin, Piston Rings and Circlips JP Piston Made in AustraliaCompr. Ratio 7,8 : 1Price per PairCompression Rings:Thickness 1/8”Depth: 3 mmOil Ring Thickness: 4 mmDepth: 3 mmRing Gap 0,25 mmPlease look at all pictures