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Boyer AJS/Matchless Single Side Points MKIV High Power Ignition 12v 3" Back Plate Die magnetic plate is female conical to accept the male conical of the cam Made in England Please look at all pictures

Boyer MKIV Ignition Kit. Triumph/BSA. Single/Twin 6V. Dynamo Model only. Direct current. Made in England Please look at all pictures

Boyer MKIV Ignition Kit. Triumph/BSA. Dist. Single 6V Made in England Please look at all pictures

Boyer Micro Power Ignition Kit Triumph/BSA Single Side Point 12V Made in England Please look at all pictures

MK IV, Triumph, BSA 3-Cylinder, 12 V
T150, T150, A75 use 6v coils only not 4v
 

Norton Ignition light control
Unit 850 MKIII - 1975

IGN = white
AL= green/white
AL= green/yellow
WL= white/brown
E= red

Made in England

BSA 500cc
Gold Star B50SS 1971
Gold Star B50SS 1972
Victor B50T 1971
Victor B50T 1972
Victor B50MX 1971-72
Victor MX 1973-75
P34 MX500 1973-74

BSA 750cc
Lightning A70L 1972

Norton 650cc
Supersports 650SS 1969

Norton 750cc
Roadster 1973-74
Hi Rider 1973-74
Interstate 1973-74

Triumph 750cc
Bonneville 1973-75
Bonneville 1976
Hurricane X75 USA 1973-on
Tiger, TR7 1973-76
Bonneville 1977-78
Bonneville Later 1978
Silver Jubilee 1977
Tiger 1977-78
Tiger Later 1978

Norton Commando MKIII

BSA A75  Triumph Trident T150  4 V Ignition Coil Set of 3 only for motorcycles in conjunction with points (contact) - not Boyer measurements see last pict.

Boyer ignition 12V MK IV Norton Atlas, Commando.use 6v coils only not 12v. or Boyer twinspark coil.

Contact Breaker Drive Gear - Coil Ignition
OD: 77.8mm
ID: 10.3mm
W: 11.1mm
f. Distributor or electronic ignition

Made by Velocette - Velocette Ltd.