Champion Spark Plug N3C

TRIUMPH Pre-Unit Alloy Head, T100, TR5. TR6, T120, T110. Unit Construction 650, 1970 on. T140/TR7, upto 1979.

A.J.S. 16 Sceptre, 31CSR, 14CSR, Y4 Scrambler.

ARIEL OHV models Alloy Head: HS (gap .016")

BSA A50W, A65H, A65FS, A65L, A65SS. B25 Starfire. B34GS Clubmans: Road Use, Scrambler. Gold Star Racer: Road Use, C15, C25 Bantam Models: Rocket 3.

DOT Vale Onslow Conversions: Trials 3/4" reach.

FRANCIS BARNETT Scrambler 82 (AMC Eng.)

GREEVES 36MX4, Griffon 56 & 58.

JAMES 250cc Scrambler.

MATCHLESS G3 Mercury, G12CSR Monarch, G2CSR Monitor Super Sports.

NORTON Model 18 490cc OHV: 30, 40 Alloy.

VELOCETTE Viper Special, Viper Clubman, Venom Endurance, 350 Scrambler, 500 Scrambler & Vee-line models. Venom Thruxton.

VILLIERS ENGINES 246cc, 33A, 34A, 36A. 247cc Starmaker (scrambles) (gap .016")

VINCENT Grey Flash 500cc.

Set all spark plug gaps .020" unless otherwise shown.