TRIUMPH 120 T140 BONNEVILLE, BSA, AJS, ARIEL, CHAMPION N3C PLUGS ARE RECOMMENDED FOR THE FOLLOWING MOTORCYCLES:AJS - 14CR, 146S, 16CS, 18CS, 31CSR, Y4 SCRAMBLERARIEL - HSBSA - A65 SS, B25 STARFIRE, B34 GS CLUBMANS ROADUSE AND SCRAMBLER, GOLD STAR RACER - ROAD USE, C15 S, C25, ROCKET 3DOT - VALE ONSLOW CONVERSION, TRIALS 3/4" REACHFRANCIS BARNETT - SCRAMBLER 82GILERA - B300 LONG REACHGREEVES - 36MX4, GRIFFON 56 AND 58HOREX - IMPERATOR, SB35JAMES - 250CC SCRAMBLERMATCHLESS - ALLOY HEAD SCRAMBLERS 1950 ONWARDS G2CSR MONITOR SUPERSPORTSMOTOBECONE - 350 cc 2 cyl.NORTON - MODEL 18 490cc OHV 30, 40 ALLOY HEADPARILLA - 250CRUMI - JUNIOR 125ccTRIUMPH - TR6 T120 1968 ONWARDS,T150 TRIDENTVELOCETTE - VIPER, VIPER CLUBMAN, VENOM CLUBMAN, VENOM ENDURANCE, 350 AND 500 SCRAMBLER AND VEE-LINE MODELS 250cc VICEROY VENOM THRUXTONVILLIERS ENGINES - 246CC 33A 34A 36A247 STARMAKER (SCRAMBLES)(GAP .016")VINCENT - GREY FLASH 500CC