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SPARK PLUGS

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NGK B6HS
B6HS
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AJS, Matchless 350/500 singles iron head
Ariel Square 4 Mk1 alloy head
Ariel OHV singles iron head
BSA A7/10 iron head
BSA B31/32/3334, M33 all iron head
BSA C12 
Norton Model 18/30/40 iron head
Norton ES2, 88, 7 iron head
Triumph Terrier and Cub iron head
Triumph T100, T110 iron head
Triumph TRW500 SV
Triumph 3H
Velocette all iron heads
Ariel  side valves, 14mm, short shaft
Triumph 3S

NGK B8ES
B8ES
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BSA A50W, A65H, A65FS, A65L, A65SS, B25, B34 alloy, C15S, C25, A75
Norton Model 30, 40 alloy
Triumph TR6, T120 1968>, T150
Velocette Thruxton

NGK BP7ES
BP7ES
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Norton Commando normal use

BPR7EIX IRIDIUM PLUG COMMANDO
BPR7EIX
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The best plug for your Commando!

NGK BP8ES
BP8ES
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AJS, Matchless, Norton hybrids
Norton Atlas, P11A (gap .025")
Commando hard riding

Champion L82C
L82C
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AJS, Matchless 350/500 singles iron head
Ariel Square 4 Mk1 alloy head
Ariel OHV singles iron head
BSA A7/10 iron head
BSA B31/32/3334, M33 all iron head
BSA C12 
Norton Model 18/30/40 iron head
Norton ES2, 88, 7 iron head
Triumph Terrier and Cub iron head
Triumph T100, T110 iron head
Triumph TRW500 SV
Triumph 3H
Velocette all iron heads

Champion L86C
L86C
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Ariel  side valves, 14mm, short shaft
AJS, Matchless 350/500 singles iron head
Ariel Square 4 Mk1 alloy head
Ariel OHV singles iron head
BSA A7/10 iron head
BSA B31/32/3334, M33 all iron head
BSA C12 
Norton Model 18/30/40 iron head
Norton ES2, 88, 7 iron head
Triumph Terrier and Cub iron head
Triumph T100, T110 iron head
Triumph TRW500 SV
Triumph 3H, 3S
Velocette all iron heads

Champion N3C
N3C
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BSA A50W, A65H, A65FS, A65L, A65SS, B25, B34 alloy, C15S, C25, A75
Norton Model 30, 40 alloy
Triumph TR6, T120 1968>, T150
Velocette Thruxton

ChampionN4C
N4C
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Ariel Leader, Arrow
BSA A50, A50C, A50CC, A65, A65LC, A65R, A65T
BSA B40, SS90, B44, C15, SS80
Norton Dominator, Mercury
Triumph TR5 Trophy, TR5A, 6T alloy head
Triumph 3TA civilian, 5TA, T100A, TR25W
Triumph TR6, T120 > 1968
Velocette MSS alloy head

Champion N5C
N5C
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AJS, Matchless all models 1950-'64 alloy head
Ariel Square 4 MkII alloy head
BSA B32 alloy head
BSA C11G, C15, C15T
Norton 16H and Big Four with14mm plug hole
Norton ES2, 88, 7, 99 alloy head
Norton 19R, 19S, 50, 77, 500T
Triumph 3TA dDutch army low compression
Triumph T120, TR6, T140, TR7 electronic ignition
Velocette MAC alloy head

Champion N7YC
N7YC
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Norton Commando normal use