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complete
+60 = 80.5 mm
compr. ratio 9.4:1
Made by GPM
Middle gudgeon pin to lowest point of piston: 29 mm
Middle gudgeon pin to highest point of piston: 41,5 mm
Gudgeon pin diam. 19 mm

can be used f. Norton
Piston Clearance 0.12mm or 45thou with piston rings, circlips and gudgeon pin

BSA B33 Piston +020= 85.5 mm
1946-1953
Hep 11341+20
65-1260Compr. ration 6.8:1slight rusty rings
to be used with flywheels
65-1235 and 65-1235
to be used with conrod 66-482
Piston Clearance 0.12mm or 45thou
Compression Height: 31mm
Piston top - Gudgeon pin top: 22 mm
Gudgeon pin diameter: 19 mm
for long conrodwith gudgeon pin, circlips and piston rings

1946-1953
Hep 11341+40
+040 = 86 mm
65-1262 Compr. ration 6.8:1

to be used with flywheels
65-1235 und 65-1235
to be used with conrod 66-482
Piston Clearence 0.12mm or 45thou
Gudgeon Pin: 19mm
Compression Height: 31.1mm
for long conrod B33 M33 B34 Gold Star distance between 2 ends of piston ring must be 0,5 mm
 

Norton ES2 Piston Std.
complete
GPM/Gandini
Outsidediameter 79mm
gudgeon Pin 22 mm
Compression Height: 35.1mm

Piston Clearance 0.12mm or 45thouincluding gudgeon Pin, piston rings and circlips

Norton ES2 Piston +020
complete
GPM/Gandini
STD. 79.0mm +020 (79.5mm)
gudgeon pin 22 mm
Compression Height: 35.1mm

Piston Clearance 0.12mm or 45thou
including gudgeon Pin, piston rings and circlips  

Norton ES2 Piston +040
complete
GPM/Gandini
STD. 79mm +040 (80.0mm)
gudgeon pin 22.25 mm
Make: Gandini Italy
Compression Height: 35.1mm

Piston Clearance 0.12mm or 45thou including gudgeon Pin, piston rings and circlips

Norton ES2 Piston +060
complete
GPM/Gandini
M18
STD. 79.0mm +060 (80.5mm)
Gudgeon Pin 22 mm
Compression Height: 35.1 mm
Length gudgeon Pin is 66 mm
Total weight: 466g
Piston Clearance 0.12mm or 45thou
including gudgeon Pin, piston rings and circlips

BSA 250cc
Piston Assembly complete with piston rings, circlips and gudgeon pin
Piston Clearance 0.12mm or 45thou

Compression Height: 25.2mm
C11 1939-55
C12 1955-58
can also be used for C10, even if they usually had a flat top Measurements see last pict. and techn. data

Compr. ratio 8.25:1
complete
Price per Pair
+080= 72 mm
Gandini
for Iron and Alloy Head 1950-62 including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou

Velocette Piston Venom/Thruxton +040= 87 mm
newcomplete with Piston Rings, Gudgeon Pin and Circlips
Piston Clearance 0.12mm or 45thou

Supplied by Velocette Company EnglandPlease look at all pictures

Velocette Piston Venom/Thruxton STD= 86mm
newcomplete with Piston Rings, Gudgeon Pin and Circlips
Piston Clearance 0.12mm or 45thou

Supplied by Velocette Company EnglandPlease look at all pictures

Velocette Piston Venom/Thruxton +020 = 86,5 mm
newcomplete with Piston Rings, Gudgeon Pin and Circlips
Piston Clearance 0.12mm or 45thou

Supplied by Velocette Company EnglandPlease look at all pictures

High CompressionTriumph.
T100R, T100T unit
9:1,
69mm +20 = 69.5 mm
Tiger 100 Unit
Daytona
500cc
Piston Clearance 0.12mm or 45thou
complete with Piston Rings, Circlips and Gudgeon Pin
to be fitted after 1967Price per pair

8:1 comp
BSA B40 Piston STD.
STD = 79mm
Gudgeon Pin Diameter: 19mm
Total Height: 73.85mm
Compression Height: 41.2mm

Piston Clearance 0.12mm or 45thou with Piston Rings, Circlips and Gudgeon Pin made in far east with english piston rings.

f. 8 and 9-stud Cylinder Barell T120, TR6, 6T, 650 cc, new, Price per Pair. STD = 71 mm complete with piston rings, circlips and gudgeon pin
Triumph 650cc STD
Compression Ratio: 9:1
Piston Clearance 0.12mm or 45thou Make: Federal Mogul

f. 8 and 9-stud Cylinder Barell T120, TR6, 6T, 650 cc, new,
Price per Pair.
Triumph 650cc
+20= 71,5 mm
Compression Ratio: 9:1

Gudgeon Pin Diameter: 17.5mm
Piston Clearance 0.12mm or 45thou complete with piston rings, circlips and gudgeon pin Fedreal Mogul

Norton Twin 500 cc
Piston Ring Set / Piston Rings STD.
GPM
66 mm
Dominator 7,77,88 comp rings. Thick. 0.062" = 1.59mm = 1/16". Comp Ring. Deep. 0.111" = 2.83mm. Oil Ring. Thick. 0.157" = 3.98" = 5/32. Oil Ring. Deep. 0.110" = 2.81mm.

Norton Twin 500 cc Piston Rings +020
GPM
66.5 mm
Dominator 7,77,88 comp rings. Thick. 0.062" = 1.59mm = 1/16". Comp Ring. Deep. 0.111" = 2.83mm. Oil Ring. Thick. 0.157" = 3.98" = 5/32. Oil Ring. Deep. 0.110" = 2.81mm.

Norton Twin 500 cc
Piston Ring Set / Piston Rings +040
GPM
67 mm
Dominator 7,77,88 comp rings. Thick. 0.062" = 1.59mm = 1/16". Comp Ring. Deep. 0.111" = 2.83mm. Oil Ring. Thick. 0.157" = 3.98" = 5/32. Oil Ring. Deep. 0.110" = 2.81mm.

JAP Piston +020
57.5mm +020 = 58mm
Hepolite
Gudgeon Pin: 15.4mm
Compression Height: 26.9mm

only one compression ring
no oil ring
no circlips

Velocette Piston Venom/Thruxton +060 = 87,5 mm
newcomplete with Piston Rings, Gudgeon Pin and Circlips
Piston Clearance 0.12mm or 45thou

Supplied by Velocette Company EnglandPlease look at all pictures

BSA Piston +20 500cc B50/Goldstar
84.5mm
Piston Clearance 0.12mm or 45thou
Compression 10:1
compr. hight: approx. 32.6 mm

Gudgeon Pin Diameter: 19mm

BSA Piston 85mm B50 Goldstar +40 500cc Unit Construction. BSA DBD Gold Star Pre Unit STD
Diameter of this piston  = 85mm with gudgeon pin, circlips and piston rings

Piston Clearance 0.12mm or 45thou
Compression 10:1
compr. hight: approx. 32.6 mm

Gudgeon Pin Diameter: 19.00mm Please look at all pictures

BSA Piston Std. 500cc B50/Goldstar
84mm
Compression: 10:1
Compression height: approx. 32.8 mmWeight 459 g

Gudgeon Pin Diameter: 19mmincluding gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thou

Triumph Piston TR6,T120,T110 Pre Unit +060
with piston rings, circlips and gudgeon pin
71mm +060= 72.5mm
comp. rat.: 7:1

for Alloy Head
if you wish to lower the compression of an iron head engine, these pistons can be used. Giving approx. 6.76:1
Piston Clearance 0.12mm or 45thou

Made in EnglandPrice per pairPlease look at all pictures