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BSA A10 Pistons Standard Size
incl. Rings, Gudgeon Pins, Circlips
7.25:1
Piston Clearence 0.12mm or 45thou
STD= 70mm price per pair Please look at ALL pictures

BSA B33 Piston +020= 85.5 mm
1946-1953
Hep 11341+20
65-1260 Compr. ration 6.8:1 slight 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 conrod with gudgeon pin, circlips and piston rings

8:1 Compression
BSA B40 Piston +60 = 80.5mm
Pin diameter: 19.00 mm
Middle Gudgeon Pin to top of piston: 41.25 mm
Length Gudgeon Pin: 66 mm
Piston Clearence 0.12mm or 45thouwith Piston Rings, Circlips and Gudgeon Pin

BSA Piston complete
8:1 Compression
+20 = 79, 5 mm
Piston Clearence 0.12mm or 45thou
Gudgeon Pin: 19.00 mm
Compression Height: 40.9mm
incl. gudgeon pin, piston, rings, circlips  

BSA B40 Piston +020 8.75:1 including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou

BSA B40 Piston +030 8.75:1 including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou  

BSA Piston M20 +040. 83.0mm
complete with circlips and gudgeon pin
82mm +040 (=83mm)
Piston Clearance 0.12mm or 45thou These pistons now come with 4 piston rings.
You can also use them only with 3 piston rings. measurements second picture or techn. data including gudgeon pin, circlips and piston rings

BSA Piston M20 +060. 83.5mm
complete with circlips and gudgeon pin
82mm +060 (=83.5mm)
Piston Clearance 0.12mm or 45thou

BSA Piston M20 +080. 
complete with circlips and gudgeon pin

Piston Clearance 0.12mm or 45thou

BSA Chaincase Stud f. Magdyno Strap B31 M21

3.3/16" x 5/16"26TPI BSC/18TPI WW

Made in England

Clutch Spring Cup BSA B31-A10
f. 6.spring Clutch Type
Set - 6 pieces

BSA Magneto Dynamo Strap
B & M Group B31. B32. B33. B34. M20. M21. M33.
L = 238 mm

66-2353 for 1956
66-2320 for 1954/5

Kickstart Pinion Bush BSA B31/A10
B31,B32,B33,B34
Rigid and Sw. Arm AD: ca. 23.90mm - 15/16" ID: 19.10mm - 3/4" L: 20.5mm - 13/16" Please note, sometimes these bushes come oversize, to make them fit in the Kickstart Pinion. Tolerance 0,05 mm

Primary chain case BSA
27-8704/31-7502

BSA/Triumph Gearbox Thrust Washer A75 & T140
Made in England

BSA Piston B33/M33 1954-60 +060=
86.5 mm
Made in Italy
middle gudgeon pin to Crown 48 mm
Piston Clearance 0.12mm or 45thou
for short conrod
Compression Ratio: 7.5:1
65-1613 Conrod 3/4 pin with piston rings, circlips and gudgeon pin

BSA/Triumph Piston B25 & TR25 +040

Bore: 67mm +040 (=68mm) including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou

comp. ratio 9.25:1

Bsa Sloper Piston. 500cc. 1925-31 +020

Measurements see last pict. gudgeon pin 16 mm

S25,S26,S27,S28,S29,S30-
9,S31-7 493cc ,SV 1925-31 Please look at all pictures including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou

BSA Piston +040 Pair. 1950-59. also Ariel 1952- 8:1 Compression including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou Price per pair  

BSA A75. Triumph T150 Piston +060 Set Cast AlloyCompression ratio 9:1including gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thouset of 3Please 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

BSA Piston +40= 86 mm  OHV 1947-52 . B33, B34, B34 Gold Star 8.5:1 JP Long Conrod mod. only. Rod number o/e 66-483 85mm std Please look at all pictures including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou  

BSA Piston +20  OHV 1947-52 85,50mm. 1947-1952. +020 = 85.5 mm B33, B34, B34 Gold Star 8.5:1 Long stroke  Models only. Conrod number o/e 66-483 85mm std  JP including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou  

BSA Piston +60 OHV 1947-52 86,5mm. 1947-1952. B33, B34, B34 Gold Star 8.5:1 JP Long Rod Models only. Rod number o/e 66-483 85mm std including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou

BSA Piston STD OHV 1947-52 85mm. 1947-1952. = 85mm B33, B34, B34 Gold Star 8.5:1 Long stroke  Models only. 
Conrod number o/e 66-483 85mm std  JP including gudgeon Pin, piston rings and circlips Piston Clearance 0.12mm or 45thou