AJS Piston 498 ss SV. 1928-30. K9. M9. R9 STDSTD = 84 mm Compression hight 1 29/32”Gudgeon pin diameter 11/16”Piston Clearance 0.12mm or 45thou incl. Gudgeon Pin, Piston Rings and CirclipsPlease look at all pictures
Ariel Red Hunter Piston 500cc STD = 81.812mm
Compression Ratio 7.5 : 1
Make JP
Piston Clearance 0.12mm or 45thou
OHV Red Hunter, VG, VH
Measurements see last picture and techn. data
Incl. Gudgeon pin, piston rings, circlips