Champion spark plug application guide for British motorcycles

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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
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