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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 A6
     
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     All new motorcycle items listed are replica/pattern parts unless otherwise stated in description. Any references made to original manufacturer's name or part numbers (O.E.M.) is done  for information only and does not imply that the items  are original.

     






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    Company registration: UK 7161335

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