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Norton 500cc, Dominator, Mod.88, Mod.7, Mod.77
+60 = 67.5 mmJP Pistons Made in Australia 7                         1949-5588                       1952-6388 Nomad          196088SS                   1961-66197cc, OHV, CR 7.8:1, 2 cyl including gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thouPrice per pair Please look at all pictures 

BSA DBD Gold Star 500cc Piston +040= 86 mm. BSA Unit Gold Star 500cc +080
Diam. 86 mm
9.5:1
Pin Diameter: 19mm including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou Please look at all pictures

BSA DBD Gold Star Pre Unit 500cc Kolben +060. 86. mm. BSA Unit Gold Star 500cc +100
GPM Slipper
86.5 mm
9.5:1
Piston Clearance 0.12mm or 45thou
Can be used on BSA B50 as a +80 Pistonwith Piston Rings, Circlips and Gudgeon Pinplease look at all pictures

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

Piston Assembly complete
BSA C10/C11/C12 Piston Std.
incl. rings, gudgeon pin, circlips
STD= 63mm
Piston Clearance 0.12mm or 45thou
C11 1939-55
C12 1955-58
can also be used for C10, even if they usually had a flat top measurements see last pict. please and techn. data

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

BSA C11/C11G/C12 Piston +60 Assembly complete with Gudgeon Pin, Piston Rings and Circlips
250cc
Piston Clearance 0.12mm or 45thou
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

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

Triumph Piston 750cc T140V/TR7V +20
76mm+20,
compr. ratio: 7,4:1,
price per Pair
Low comp.
gudgeon pin diameter: 19 mm
Piston Clearance 0.12mm or 45thoucomplete with piston rings, circlips and gudgeon pin

Triumph Pistons 750cc T140V/TR7V Std.
compr. ratio 7,4:1,
76mm std
Price per Pair
low compression
gudgeon pin diameter 19 mm
complete with piston rings, circlips and gudgeon pin
Piston Clearance 0.12mm or 45thou

1 Pair of pistons, incl. pinion, circlips and piston rings
Made in Italy
Compression ratio: 8.25:1
+060=71.5 mm
Gandini

for Iron and Alloy Head 1950-62
Piston Clearence 0.12mm or 45thou

Triumph Pistons Hepolite 500cc. Daytona std.
T100R, T100T unit
9:1, STD, 69mm
Tiger 100 Unit
Daytona
500cc
Piston Clearance 0.12mm or 45thou
Pin Diameter: 17.45mm

to be fitted after 1967with Piston Rings, Circlips and Gudgeon PinPrice per Pair

69 mm bore, +20 = 69.5 mm
Price per Pair
7:1
Triumph, 5Ta
Pistons
500cc
500 Unit Low Comp

Piston Clearance 0.12mm or 45thouwith Piston rings, circlips and gudgeon pin
 

Pre Unit TR6,T120,T110 650cc Ratio 7:1,
+20 = 71.5 mm
price pair
Alloy Head Pre Unit
Triumph.

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 with Piston Rings, Circlips and Gudgeon Pin

Norton 600cc 650cc Piston. Pair GPM +20
68,5 mm Diameter, new
at 600 cc Compr. Ratio: 7.4:1
at 650 cc 8.25:1
middle gudgeon pin-top: 40 mm
Gudgeon pin diameter: 17. 5 mm - 11/16"

Piston Clearance 0.12mm or 45thou
297 g weight
Mod. 77 v- 1956-58
Mod. 99 1956-62
Nomad 1968
650 1960-63
Mod. 99SS 1961-62
650 SS 1961-70
including gudgeon Pin, piston rings and circlipsprice per pairPlease look at all pictures
 

1946-1953
STD= 85 mm
Hep No. is 11341Compr. ration 6.8:1
Compression Height: 31mm
Piston top - Gudgeon pin top: 22 mm
Gudgeon pin diameter: 19 mm

to be used with flywheels
65-1235 und 65-1235
to be used with conrod 66-482
Piston Clearence 0.12mm or 45thou
long conrod version
with Piston Rings, Circlips and Gudgeon Pin

compression ratio 7:1,
STD=71mm
price per Pair
Triumph, TR6,T120,T110 650cc
Alloy Head pre unit + Iron 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
complete with Piston Rings, Gudgeon Pin and Circlips

Triumph 3TA/T90/T21 Pistons +060
STD. 58.25mm +060 (59.75mm)
Price per Pair

Piston Clearance 0.12mm or 45thou
Made by GPM, Italy
Compr. ratio 7,5:1 including gudgeon Pin, piston rings and circlips

BSA Piston M20 Std.Nos.
no piston rings
with gudgeon pin
with circlips
82mm
Piston Clearance 0.12mm or 45thou Please view all pictures

BSA Piston Assembly +020 A7 with Piston Rings, Circlips and Gudgeon Pin
Price per Pair
+20 = 66.5 mm
Compression Ratio 6.5:1
Piston Clearence 0.12mm or 45thou