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Royal Enfield Piston Std.
Bore: 70mm
no rings a. circlips

Royal Enfield Piston Std.
Bore: 54mm

JAP Piston Hepolite
Bore: 60mm +030
Outside diameter: 60.7mm
Gudgeon Pin diameter: 14.5mm
Bottom to middle of gudgeon pin: 31.25mm
Middle of gudgeon pin to top edge of the piston: 22.25mm

JAP Piston 98cc +040
51.5 mm +040 = 52.5mm

Ariel Piston Red Hunter Models 1934-36 +060
STD/Bore: 61mm +030 = 61.5mm
OHV
Model: LH, Red Hunter, LG, LH, De luxe, OG, OH
C.R: 6 to 1
Hepolite Heplex

new, old stock

JAP Piston 98cc +040
Bore: +040 = 65.5mm
Gudgeon Pin Diameter: 15.5mm
Compression Height: 30.25mm
Hepolite

Ariel Piston Std.
Bore: 60mm
NOS

BSA Petrol Tap 3/8" Banjo Pull onThread on tankside top 3/8" Thread pitch 1,337 mm OD: 16,66 mmID Core DM: 15,25 mm  TPI 19 Thread bottom 1/8"Thread pitch 10,907 mm    OD: 9,73 mmID Core DM:  8,80 mm  TPI 28suitable Banjo is 42-8073Please look at all pictures
 

Villiers Piston 60mm Std.

Villiers Piston Mark 31C/3T 148cc/324cc
57mm 0+15

Villiers Piston for Models XXVA, XVIIIA 250cc 1935-40 +060
63mm +060 (64.5mm)

Villiers Piston 50 mm +060
(=51.5mm)

Villiers Piston 98cc 1938/47 
50mm
HepolitePlease look at all picturesMeasurements last picture

Villiers Piston DeLuxe Junior 98cc +060
50mm +060 (51.5mm)

Triumph Piston up to 1939 +030
63mm +030 (63.75mm)

Triumph Piston up to 1939 +030
63mm +030 (63.75mm)

Villiers Piston 197cc 1938/40
59mm +060 (60.5mm)

Villiers Piston 197cc 1938/40
59mm +060 (60.5mm)

Villiers Piston 197cc 1938/40
59mm +040 60mm

Triumph Piston T70 bis 1939 O.H.V Std.
63mm

NOS

Triumph Piston T70 -till 1939 O.H.V Std.
63mm

NOS

Triumph Piston T70 bis 1939 O.H.V Std.
63mm

NOS

Triumph Piston T70 bis 1939 O.H.V Std.
63mm

NOS

Triumph Piston T70 bis 1939 O.H.V Std.
63mm

NOS

Villiers Piston Midget Marvel 98cc 1929/32 +040
50mm +040 (51mm)