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Ariel 350
1933-39
STD
4469
72mm
Gudgeon pin diam. 22 mm
Compr. hight: 73.5 mm

OHV
Model: NG, NH, Red Hunter
C.R: 6.2:1
STD=71.983mm

with Gudgeon Pin
no Piston Rings
new,old stock

Royal Enfield 350cc
+020

Royal Enfield 250cc
STD
64mm
Gudgeon Pin Diameter: 18.9mm
Compression Height: 22.15mm

no Gudgeon Pin
no Piston Rings

Piston used

63mm

AJS/Matchless 250cc used
62.8mm

no Gudgeon Pin
no Piston Rings

P&M
250cc
1933-38
+40
61mm

P&M
250cc
1933-38
3990
+60
61.4mm

P&M
7447
STD
1936-38
87mm

with Gudgeon Pin

P&M
250cc
1933-38
3990
+60
61.5mm

with Gudgeon Pin and Piston Rings

P&M
248 cc 1933-47
OHV, 10,20,40,60,70, Redwing, Panther
CR 6:1
3990
+60
61.5mm

with Gudgeon Pin and Piston Rings

P&M
248 cc 1933-47
OHV, 10,20,40,60,70, Redwing, Panther
CR 6:1
3990
+40
61mm

with Gudgeon Pin
no Piston Rings

9890
+30
68.6mm (pair)

P&M
250cc
1933-39
3990
+40
61mm

P&M
250cc
1933-39
3990
+40
61mm

P&M
248 cc 1933-47
OHV, 10,20,40,60,70, Redwing, Panther
CR 6:1
3990
+40
61mm

with Gudgeon Pin and Piston Rings

P&M
248 cc 1933-47
OHV, 10,20,40,60,70, Redwing, Panther
CR 6:1
3990
+60
61.4mm

with Gudgeon Pin and Piston Rings

3462
2923
+60
65.4mm

with Gudgeon Pin and Piston Rings

Piston Diameter: 65.4mm
Pin Diameter: 15.5mm
Center of Pin to top Edge: 36.55mm
Center of Pin to top of crown: 57.45mm
Center of Pin to Bottom: 40.05mm

16751
STD
Front
59mm used

with Gudgeon Pin and Piston Rings

for restoration - no warranty

Villiers
STD
5514
62.9mm

54.6mm

51mm

Scott Piston used 1683
+30
50.7mm

51.4mm

with Gudgeon Pin
no Piston Rings

54.6mm

79mm
BMW

with Piston Rings
no Gudgeon Pin