Motorcycles and Scooters

B.S.A

750cc

CC Model Standard Plug Gap (mm) Iridium Power
750cc A75 Rocket 3 W24ES-U 0.5 IW24

650cc

CC Model Standard Plug Gap (mm) Iridium Power
650cc Thunderbolt/Firebird W24ES-U 0.5 IW24
650cc Lightning, A65H, A65FS, A65L, A65SS W24ES-U 0.5 IW24
650cc A10RGS/A10RR/A10SR W22ES-U 0.5
650cc A65/A65LC/A65R/A65T W22ES-U 0.5

600cc

CC Model Standard Plug Gap (mm) Iridium Power
600cc M21 Cast Iron Heads W20FS-U 0.5 IWF22
600cc M21 Aluminium Heads W16ES-U 0.5

500cc

CC Model Standard Plug Gap (mm) Iridium Power
500cc A7 W22FS-U 0.5 IWF22
500cc A7SS/A50/A50C/A50CC W22ES-U 0.5
500cc A50W W24ES-U 0.5 IW24
500cc B33 W22FS-U 0.5 IWF22
500cc B34 Cast Iron Heads W22FS-U 0.5 IWF22
500cc Aluminium Heads W22ES-U 0.5
500cc B34 GS Clubman/Cataline W24ES-U 0.5 IW24
500cc Gold Star Racer W27ES-U 0.5 IW27
500cc B50MX/Victor Motor-Cross W24ES-U 0.5 IW24
500cc B50SS W22ES-U 0.5
500cc B50T/Victor Trial W22ES-U 0.5
500cc Royal Star W24ES-U 0.5 IW24
500cc M33 W20FS-U 0.5 IWF22

440cc

CC Model Standard Plug Gap (mm) Iridium Power
440cc Victor B44R/B44S/B44ET W22ES-U 0.5
440cc B44GP, B44VS W22ES-U 0.5

350cc

CC Model Standard Plug Gap (mm) Iridium Power
350cc Fury W24ES-U 0.5 IW24
350cc B40SS90 W22ES-U 0.5
350cc B32GS/B40 W22ES-U 0.5
350cc B32 Aluminium Heads W22ES-U 0.5
350cc B32 Cast Iron Heads W22FS-U 0.5 IWF22

250cc

CC Model Standard Plug Gap (mm) Iridium Power
250cc B25T Victor, B25 Starfire W24ES-U 0.5 IW24
250cc B25R/SS Gold Star W24ES-U 0.5 IW24
250cc C15SS80 W22ES-U 0.5
250cc C15S/C25 W24ES-U 0.5 IW24
250cc C15/C15T W20ES-U 0.5
250cc C12 W22FS-U 0.5 IWF22
250cc C10L/C10/M20/M21 Aluminium Heads W16ES-U 0.5

175cc

CC Model Standard Plug Gap (mm) Iridium Power
175cc Bantam D10, D14, D14/4, D14/5 W22ES-U 0.5
175cc Bantam 175, Bushman W22ES-U 0.5
175cc Tracker W24ES-U 0.5 IW24

150cc

CC Model Standard Plug Gap (mm) Iridium Power
150cc D3 W22FS-U 0.5 IWF22

125cc

CC Model Standard Plug Gap (mm) Iridium Power
125cc Tracker W24ES-U 0.5 IW24

75cc

CC Model Standard Plug Gap (mm) Iridium Power
75cc K1 Beagle U20FS-U 0.5 IUF22

50cc

CC Model Standard Plug Gap (mm) Iridium Power
50cc John McLaren 1997 on W24FS-U 0.6 IWF24

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