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58.1mm

no Gudgeon Pin
with Piston Rings

7622
16980
70.9mm

with Gudgeon Pin
no Piston Rings

Hepolite
4636
67.8mm

no Gudgeon Pin
no Piston Rings

Aspera
63.35mm

with Gudgeon Pin and Piston Rings

Heplex NOS
5338
+60
64.4mm

1935/6 250 ccm OHV Model: De Luxe, 35/3, B2, B18
1934/6 500 cc OHV Model: Twin, J34/11, J35/12, J36/12
C.R: 7.25 to 1
STD = 63 mm

for restoration - no warranty

Hepolite
18140
71/131
63mm

BSA Piston NOS
7610
+60
64.6mm

with Gudgeon Pin

for restoration - no warranty

Heplex
4638
14005
STD
59.7mm

with rusty Gudgeon Pin

Hepolite
3185
STD
AJS
82.2mm
STD=82.5mm
SV Model 4, 9, 14
OHV Model 8, 9, 18, 18T, 8SS, 18SS
C.R. 5 to 1

with Piston Rings
no Gudgeon Pin

Heplex

350 OHV
71mm
5123
STD

with Gudgeon Pin and Piston Rings
for restoration - no warranty

W139
66mm

60.9mm

with Gudgeon Pin
no Piston Rings

Heplex
14005
4638
STD
60mm

Heplex
15663
STD
69.9mm

no Gudgeon Pin
no Piston Rings

15638
18529
+060
71.4mm

with Gudgeon Pin
no Piston Rings

65mm

with rusty Gudgeon Pin

8267
+040
63.8mm

OHV
Model: C11, C11G, C12
STD = 63 mm

no Gudgeon Pin, no Piston Rings
for restoration - no warranty

64.1mm

with Gudgeon Pin and Piston Rings

66mm

no Gudgeon pin
no Piston Rings

17952
+030
62mm

no Gudgeon Pin
no Piston Rings

58.7mm

+030
79.7mm

with Gudgeon Pin, no Piston Rings

13530
+040
946733
80.4mm

with Gudgeon Pin
no Piston Rings

68.8mm

no Gudgeon Pin
no Piston Rings

Heplex
12871
+040
616820
70.7mm

no Gudgeon Pin
no Piston Rings