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Norton Twin 600/650cc Piston Ring Set / Piston Rings +020
STD= 68mm
020 = 68.5 mm
GPM
Norton Dominator
Mod. 99comp 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 600/650cc Piston Ring Set / Piston Rings
STD= 68mm
Gandini
Norton Dominator
Mod. 99comp 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.

Speedo Drive 2:1
BG5330/0287
Smiths Replica
19-9212
BSA A65 - f. kmH

Norton ES2, Dominator wide + slimline
Triumph 3TA, 5TA, T120. T100. T100S. T100R. T100C. T100T. T90 1968-70
Size hole: 3/4"Mounted on the rear wheel, rhs.
Turns clockwise on side where Speedo Cable comes out.
Cable comes out underneath the axle.
Norton is only rear Wheel

Mounted on Front wheel, lhs, speedo cable turns anticlockweise.Please look at all pictures

Made in England

99-9976, BG5330/0287
Smiths Replica
Size hole: 3/4"

Mounted on the rear wheel, rhs.
Turns clockwise on side where Speedo Cable comes out.
Cable comes out underneath the axle.

Mounted on Front wheel, lhs, speedo cable turns anticlockweise.

AJS/Matchless Piston 350 cc +060 Alloy Head 1948-55 G3L 
Compression 6.3:1
complete incl. Rings, Circlips and Gudgeon Pin
Piston Clearence 0.12mm or 45thou
69 mm = STD
+60 = 70,5 mm
JPtotal hight 82 mmplease look at all pictures

AJS/Matchless Piston 350 cc +020 Alloy Head with Gudgeon Pin, Circlips and Piston Rings
Compression 6.3:1
Gudgeon Pin Diameter: 7/8" - 22.3mm
complete incl. Rings
1948-55 G3L 
Piston Clearence 0.12mm or 45thou
69mm=STD
+20=69,5mm
JP Piston Made in Australiatotal hight 82 mmplease look at all pictures

AJS/Matchless Piston 350 cc +030 Alloy Head 1948-55 G3L with Piston Rings, Circlips and Gudgeon Pin
Compression 6.3:1
complete incl. Rings

Piston Clearence 0.12mm bzw. 45thou
69 mm = STD
+30 = 69,75 mm
Gudgeon Pin 22 mm
JP Piston Made in Australiatotal hight 82 mmplease look at all pictures

AJS/Matchless Piston 350cc +040 Alloy Head 1948-55
Compression 6.3:1
complete incl. Rings
G3L
Piston Clearance 0.12mm or 45thou
69 mm = STD
+40 = 70 mm
Gudeon Pin Diameter: 22 mm
JPtotal hight 82 mmplease look at all pictures

AJS/Matchless Piston 350cc +080
Alloy Head 1948-55 G3L gudgeon pin 22 mm - 7/8"

Compression 6.3:1
Std: 69mmincluding gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thoucomplete incl. Rings
f. G3LS
JP Piston Made in Australiatotal hight 82 mmplease look at all pictures

AJS/Matchless Piston 350cc STD.
Alloy Head 1948-55 G3L gudgeon pin 22 mm - 7/8"

Compression 6.3:1
Std: 69mmincluding gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thoucomplete incl. Rings

JP Piston Made in Australiatotal hight 82 mmplease look at all pictures

AJS Mod.18. 18S/G80. G80S Piston 500cc Alloy Head 1947-56  +060 = 84 mmCompression Ratio 7.2:1including gudgeon Pin / wrist pin, piston rings and circlips
Piston Clearence 0.12mm or 45thou
compression height:  1 13/16 = 46 mm
H: 81mm
Pin Diameter: 22mmplease view ALL pictures

AJS Mod.18. 18S/G80. G80S Piston 500cc Alloy Head 1947-56  +030= 83.3 mmincluding gudgeon Pin / wrist pin, piston rings and circlips
Piston Clearence 0.12mm or 45thou
Diameter: 83.3mm
compression height:  1 13/16 = 46 mm
H: 81mm
Pin Diameter: 22mmCompression Ratio 7.2:1

AJS Mod.18. 18S/G80. G80S Piston 500cc Alloy Head 1947-56 +020 = 82.5 mmCompression Ratio 7.2:1incl. rings, gudgeon pin and circlipscompression height:  1 13/16 = 46 mmPin diameter: 22mmHight: 81mmPiston Clearance 0,12mm or 45thouPlease view ALL pictures

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

Black,combination logo
115mm x 45mm

Triumph Pistons+060 Pre Unit
T100 and 5T
Compr. ratio: 9:1

64.5mm

Piston Clearance 0.12mm or 45thou

Spring Circlip A50/A65/C15/B40Toolbox Screw CirclipCom Follower

Made in England

BSA Piston B33/M33 1954-60 std.
Made in Italy
STD=85 mm
middle gudgeon pin to Crown 48 mm
Gudgeon Pin 19mm
Piston Clearance 0.12mm or 45thou
for short rod
Compression Ratio: 7.25:1
65-1613 ConrodCmp Hight 43mm+5mm domewith Piston Rings, Circlips and Gudgeon Pin  

BSA Piston B33/M33 1954-60 +020 with piston rings, circlips and gudgeon pin
Made in Italy
+020=85.5 mm

Gudgeon Pin Diameter: 19mm
Middle Gudgeon Pin to TOP: 43.5 mm
Piston Clearance 0.12mm or 45thou
Compression Ratio: 7.25:1
65-1613 Conrod

BSA Piston B33/M33 1954-60 +40 =86 mm

middle gudgeon pin to Crown 48 mm
Gudgeon Pin Diam. 19 mm
Piston Clearance 0.12mm or 45thou
for short conrod
Compression Ratio 7.25:1
65-1613 Conrodwith Piston Rings, Circlips and Gudgeon PinGandini

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 Conrod3/4 pinwith piston rings, circlips and gudgeon pin

Champion. 18mm x 1,5  diameter at thread. =Sports engines = Bosh M7AC and M5AC.
Height without Thread: 60mm.
Early H,J,K,WM20/21 Bsa.
16H Norton. Big 4
All Norton SV Mod.
Ariel OHV Mod. which use 18 mm spark plugs

Please Note:
mid war changing to 14 mm
M20 and 16H owners, please check the size of your spark plug, as it can be 14 mm or 18 mm.
If 14 mm order spark plug L86CCompareable spark plugsBosch alt M 240 T1Bosch neu M4ACNGK A-7AJS OHV Models 18mmAriel OHV Models 18mmMatchless OHV Models 18mmNorton All SV 18mmRudge 18mmSunbeam All 18mmTriumph OHV Models 18mmVilliers Engines 98cc 35PD, 197cc MK 5EVincent 18mm

Champion Spark Plug. STD OHV Engines = Bosh M8AC
Diameter at thread: 18mm x 1,5
Height without thread: 57mm
H,J,K,WM20/21 Bsa. 16H, Big4 Norton.
Mid war Bsa/Norton change to 14mm
Spark Plug Champion L86C
Please Note:
M20 and 16H owners, please check the size of your spark plug, as it can be 14 mm or 18 mm.Comparable spark plugsBosch old M145 T 1Bosch new M8ANGK A-6
 

Triumph 6T pistons +20 650cc
Pre Unit
f. Cast Iron Head
7:1
71mm +20=71.5mm
for Cast Iron Head - please do not fit to alloy head
complete with gudgeon pin, piston rings and circlips

Piston Clearance 0.12mm or 45thoumeasurements see techn. dataPrice per pair

Thunderbird 6T 7:1
Triumph, Pistons Pre Unit
71mm +40=72mm
Gudgeon Pin: 17.4mm
650cc

for Cast Iron Head - please do not fit to alloy head
complete with gudgeon pin, piston rings and circlips

Piston Clearance 0.12mm or 45thouMeasuremetns see techn. dataPrice per Pair