Champion spark plug application guide for British motorcycles

When it comes to spark plugs, you'll want to make sure you have the right spark plug for the job. Champion's spark plugs are designed to meet the needs of specific applications.

Champion Spark Plugs has developed a unique line of spark plugs that includes two-piece, three-piece and electrode gap designs. With these options, Champion provides the best fit for your specific engine application. Whether you need a standard or high performance plug, Champion has the right answer for your needs.

MODEL	ORIGINAL CHAMPION NUMBER	MODERN CHAMPION NUMBER	NGK EQUIVALENT
AJS
SV models 18mm	7	D16	A6
OHV models 14mm	L10	L86C	B6HS
OHV models 18mm	K9	D9	A6
1946 350cc	L10	L86C	B6HS
1946 500cc	L7	L82C	B6HS
1947-49 all models (cast iron heads)	L7	L82C	B6HS
1950-64 all models (alloy heads except racer)	N5	N5C	B6ES
7R racer (gap .016”)	N54R	C55R	B10EG
1964 onwards: 18 Statesman, 31 Swift, 33CSR, 33, 16C Experts	N4	N4C	B7ES
16 Sceptre, 31CSR, 14CSR, Y4 Scrambler	N3	N3C	B8ES
18CS Southerner (gap .0162)	N57R	C57R	B10EG
ARIEL
OHV models 18mm	K9	D9	A6
SV models 18mm	7	D16	A6
SV models 14mm, ½” reach	L10	L86C	B6HS
Square 4 Cast Iron & Mk. I Alloy	L7*	L82C*	B6HS
Square 4 Mk. II Alloy	N5*	N5C*	B6ES
OHV models Cast Iron 14mm except VB	L7*	L82C*	B6HS
VB	N5*	N5C*	B6ES
OHV models Alloy head except FH, HS	N5*	N5C*	B6ES
FH models	L7*	L82C*	B6HS
HS (gap .016”)	N3	N3C	B8ES
Leader, Arrow, Arrow Super Sport, Golden Arrow, Arrow 200 (gap .030”	N4	N4C	B7ES
Pixie	Z10	Z9Y	C7HSA
*Magneto .020”, Coil .025”
BSA
A7, A10GF	L7	L82C	B6HS
A7SS, A10RGS, A10RR, A10SR,	N4	N4C	B7ES
A50, A50C, A50CC,	N4	N4C	B7ES
A65, A65LC,	N4	N4C	B7ES
A65R, A65T	N4	N4C	B7ES
A50W, A65H, A65FS, A65L, A65SS	N3	N3C	B8ES
B25 Starfire	N3	N3C	B8ES
B31, B33	L7	L82C	B6HS
B32 Cast Iron Head	L7	L82C	B6HS
B32 Alloy Head	N4	N4C	B7ES
B32GS, B40	N5	N5C	B6ES
B34 Cast Iron Head	L7	L82C	B6HS
B34 Alloy Head	N5	N5C	B6ES
B34GS Clubmans: Competition (gap .016”)	N57R	C57R	B10EG
Road use	N3	N3C	B8ES
Scrambler	N3	N3C	B8ES
Gold Star Racer: Competition (gap .016”)	N54R	C55R	B10EG
Road use	N3	N3C	B8ES
SS90, Victor B44R, B44SS, Victor B44ET, B44GP, B44VS	N4	N4C	B7ES
C10L	N8	N5C	B6ES
C12	L7	L82C	B6HS
C15, C15T	N5	N5C	B6ES
C15S, C25	N3	N3C	B8ES
SS80	N4	N4C	B7ES
D1 to 1954	L10	L86C	B6HS
D1 1954 on	L7	L82C	B6HS
D3, D5, D7	L7	L82C	B6HS
D10, D14/4, D14/4S	N4	N4C	B7ES
K1 Beagle	Z10	Z9Y	C7HSA
M20, M21 Cast Iron Head	L10	L86C	B6HS
M20, M21 Alloy Head	N8	N5C	B6ES
M33	L7	L82C	B6HS
Rocket 3	N3	N3C	B8ES
DOT
197cc – 250cc Villiers Trials Models	L81 or L5	L82C	B6HS
Scrambles (gap .016”)	L57R	L87R	N/A
Vale Onslow Conversions: Trials ¾” reach	N3	N3C	B8ES
Scrambles	N57R	C57R	B10EG
Guazzoni 175cc	N84 or N5	C57 or N5C	B6ES
Vivi Monza 50cc	L86 or L7	L86C or L82C	B6HS
Others see Villiers
DOUGLAS
350cc Mark V, Dragonfly	L7	L82C	B6HS
350cc Comp. Model	L7	L82C	B6HS
350cc 80 Plus, 90 Plus	L5	L82C	B6HS
FRANCIS BARNET
Scrambler 82 (AMC Engine)	N3	N3C	B8ES
Other AMC Engines	N84 or N5	C57 or N5C	B6ES
Others see Villiers
GREEVES
Hawkstone Models (gap .016”) 24MXI, MX2, RBS, RDS (gap .016”)	L57R	L87R	N/A
24 RES, 24 RFS, (gap .016”)	N54R	C55R	B10EG
24MX4	N60	C59C	N/A
36MX4, Griffon 56 & 58	N3	N3C	B8ES
35RFS (gap .016”)	N57R	C57R	B10EG
24TJS	N9Y	N9YC
24TJ	L81	L82C	B6HS
Anzani engines (gap .020”	L87 or L7	L86C or L82C	B6HS
Other Scrambles	L64Y
Others see Villiers
JAMES
250cc Scrambles	N3	N3C	B8ES
Other AMC engines	N84 or N5	C57 or N5C	B6ES
Others see Villiers
MATCHLESS
SV models 18mm	7	D16	A6
SV models 14mm	L10	L86C	B6HS
OHV models 18mm	K9	D9	A6
1946 350cc	L10	L86C	B6HS
1946 500cc	L7	L82C	B6HS
1947-49 all models cast iron head	L7	L82C	B6HS
1950-64 all models except scrambles & racer	N5	N5C	B6ES
Scrambles (gap .016”)	N57R	C57R	B10EG
Racers (gap .016”)	N54R	C55R	B10EG
1964 onwards: G3C Maestro, G3C Trials, G80 Major, G12 Majestic	N4	N4C	B7ES
G15, G15CS, G15CSR, P11A	N6Y	N6YC	BP8ES
G3 Mercury, G12CSR Monarch, G2CSR Monitor Super Sports	N3	N3C	B8ES
G80CS Marksman, G85CS (gap .016”)	N57R	C57R	B10EG
NORTON
All SV 18mm	K9	D9	A6
16H 500cc SV	N5	N5C	B6ES
Big Four 596cc SV	N5	N5C	B6ES
Model 18 490cc OHV, 30, 40 Cast Iron	L7	L82C	B6HS
30, 40 Alloy	N3	N3C	B8ES
ES2, 88, 7, Cast Iron	L7	L82C	B6HS
ES2, 88, 7, 99 Alloy	N5	N5C	B6ES
30M, 40M (gap .016”)	N54R	C55R	B10EG
19R, 19S, 50, 77, 500T	N5	N5C	B6ES
650 Dominator, 650 Mercury	N4	N4C	B7ES
Atlas, Commando, P11A, (gap .016”)	N6Y	N6YC	BP8ES
ROYAL ENFIELD
350cc Clipper & G 248cc, Clipper & Crusader & J2 500cc, 248cc Olympic	L7	L82C	B6HS
Continental, Continental GT	L5	L82C	B6HS
Ensign, RE, Prince	L10 or L90	L86C	B6HS
350cc Bullet, 500cc Bullet ½” reach	L7	L82C	B6HS
¾” reach	N5	N5C	B6ES
Meteor Minor Sports	N5	N5C	B6ES
Super Meteor, Meteor Minor to Eng. No. SMCA7027	L7	L82C	B6HS
From Eng. No. 7028 onwards	N5	N5C	B6ES
700cc Meteor Twin 500cc Twin ½” reach	L7	L82C	B6HS
700cc Constellation	N5	N5C	B6ES
Trial Works Replica	L7	L82C	B6HS
249cc Turbo Twin	L81 or L5	L82C	B6HS
736cc Interceptor	N4	N4C	B7ES
247cc Scrambler (gap .016”)	N57R	C57R	B10EG
RUDGE
Special & Ulster 14mm Cast Iron head	L5	L82C	B6HS
14mm Alloy head	N5	N5C	B6ES
18mm	K9	D9	A6
All other models 18mm	K9	D9	A6
14mm	L7	L82C	B6HS

SCOTT
498cc-596 Flying Squirrel
Town riding	L10	L82C	B6HS
Fast riding	L7	L82C	B6HS
SUNBEAM
1946 on S7 & S8 Twins	N8	N5C	B6ES
All other models 14mm	L7	L82C	B6HS
18mm	K9	D9	A6
TRIUMPH
150cc T15 Terrier, T20, T20C, T20T, T20SL, T20SH, TR20, Super & Sports Cub	L7	L82C	B6HS
TS20 Scrambler	L5	L82C	B6HS
3T, 5T Speed Twin, 6T Thunderbird, TR5 Trophy Cast iron head	L7	L82C	B6HS
TR5 Trophy, TR5A, 6T Alloy head	N4	N4C	B7ES
T100, T110 cast iron head	L5	L82C	B6HS
T100, T100S, T100T, T110, T21, 3TA, 5TA, T100A, TR7A, TR25W	N4	N4C	B7ES
T100C, T120TT (gap .016”)	N57R	C57R	B10EG
Grand Prix 500cc (gap .016”)	L54R	L84R	n/a
Other OHV models 14mm	L7	L82C	B6HS
OHV models 18mm	K9	D9	A6
SV models 14mm (not TRW)	L10	L86R	B6HS
SV models 18mm	7	L82C	B6HS
TRW	L5	L82C	B6HS
Tiger 90	N4	N4C	B7ES
TR6, T120 pre 1968	N4	N4C	B7ES
TR6, T120 1968 on	N3	N3C	B8ES
T150	N3	N3C	B8ES
T140, TR65	N5	N5C	B6HS
VELOCETTE
GTP 250cc 2 stroke	L86 or L7	L86C or L82C	B6HS
MOV 250cc OHV	L7	L82C	B6HS
KSS 350cc MkII	N5	N5C	B6ES
MAC 350cc Cast iron head	L7	L82C	B6HS
MAC 350cc Alloy head	N5	N5C	B6ES
MSS 500cc Cast iron	L5	L82C	B6HS
MSS 500cc Alloy head	N4	N4C	B7ES
Viper Sports, Viper Clubman, Venom Endurance, 350 Scrambler (gap .025”)	N4	N4C	B7ES
500 Scrambler & Vee-line models, Venom Thruxton	N3	N3C	B8ES
LE, Valiant, Vogue (gap .025”)	Z10	Z9Y	C7HSA
Viceroy	N5	N5C	B6ES
VILLIERS ENGINES
50cc Mk. 3K	L81 or L5	L82C	B6HS
98cc Mks 1F, 2F, 4F, 6F	L86 or L7	L82C	B6HS
98cc 35PD	UK10	D9	A6
98cc Midget	8 Com	D16	A6
98cc Junior	L90 or L10	D16	A6
98cc Deluxe	7 Com.-L	D16	A6
98cc 4F, 6F	L86	L86C	B6HS
122cc 8D, 9D, 10D, 12D, 13D	L86 or L7	L86C	B6HS
122cc 11D	L81 or L5	L82C	B6HS
147cc 29C, 30C Fan Cooled	L81 or L7	L82C	B6HS
147cc Mk 8C	8 Com	D16	A6
148cc Mk 12C, 15C	7 Com.-L	D16	A6
148cc Mk 31C	L81 or L5	L82C	B6HS
173cc 2L, 3L	L81 or L5	L82C	B6HS
197cc Mk 1E, 2E, 3E	7 Com.-L	D16	A6
197cc Mk 5E	K9	D9	A6
197cc 6E, 7E, 9E, 10E, 11E	L81 or L5	L82C	B6HS
197cc Super Sports 18mm	7 Com.-L	D16	A6
197cc 9E Super Sports (gap .016”)	L57R	L87R	n/a
225cc 1H	L81 or L5	L82C	B6HS
246cc 2H	L86 or L7	L82C	B6HS
246cc 31A/4S, 31A/3S, 32A, 35A, 37A	L81 or L5	L82C	B6HS
246cc 36A Parkinson Conversion (gap .016”)	L57R	L87R	n/a
246cc 33A, 34A, 36A	N3	N3C	B8ES
247cc Starmaker (Trials)	L86	L86C	B6HS
247cc Starmaker (Scrambles)(gap .016”)	N3	N3C	B8ES
247cc Starmaker (Racing)(gap .016”)	N54R	C55R	B10EG
249cc 2T twin	L86 or L7	L86C or L82C	B6HS
249cc Mk 14A	7 Com.-L	D16	A6
250cc 4T Twin	L81 or L5	L82C	B6HS
324cc 3T Twin	L81 or L5	L82C	B6HS
346cc 14B, 27B	7 Com.-l	D16	A6
353cc 28B	L81 or L5	L82C	B6HS
VINCENT
Black Shadow	N5	N5C	B6ES
Rapide	N8	N5C	B6ES
Comet, Meteor, Lighting, Prince, Knight, Victor	N5	N5C	B6ES
Grey Flash 500cc	N3	N3C	B8ES
Other models: 14mm	L7	L82C	B6HS
18mm	K9	D9	A6cHAMPION