Clutch Spring
BSA A10 / A7 Plunger - Six spring clutch. Duplex Clutch Model Springs
C10L C11G C12 - Three spring clutch
please check this measurements against your spring
OD: 16 mm
ID: 11.4 mm
L: 37 mm
BSA C10L, C11G, C12 Clutch Spring Set of 3
Fitted to light 4-speed Gearbox with 3 springs on the clutch
These springs are not to be used with a 6-Spring Clutch
Made in England
OD: 16 mm
ID: 11.4 mm
L: 37 mm
BSA B44 Piston Ring Set / Piston Rings +040
Top rings are 1/16” thick and 1/8” wide
Oil ring 1/8” wide and 1/8” thick
fit also Norton 16H,ES2 and Model 18 Original Piston
Thickness: 1,55mm/3,15mm
+040 =80.00 mm
check thickness of piston rings
BSA A50 Piston +060 Pair
with Piston Rings, Gudgeon Pin and Circlips
Forged
measurements see last pict.
With piston rings. gapping no less than 10thou
8.5:1
Piston Clearance 0.12mm or 45thou
Price per Pair
Please look at all pictures
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
complete
compr. ratio 9.4:1
Dm. 79 mm
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 Clearence 0.12mm or 45thou
mit Kolbenbolzen, Kolbenringen und Sicherungsringen
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
BSA A50 PHC Piston Pair 65,5 + 075mm = +030 = 66.25 mm
Piston Clearance 0.12mm or 45thou
Peter Hepworth
Made in England
Compression ratio 9:1
Please see measurements in techn. data and last picture
Complete incl. Gudgeon pin, piston rings and circlips
Price per pair