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NGK has been developing spark plug technology since the 1930s and manufacture plugs for every type of automotive engine, as well as for motorcycles, marine, horticultural, plant and many other applications. Records indicate jets being done in the '80s on the carb. Car was from the Bay Area and is now in Chicago, so not a ton of altitude difference there. Once this was done, then I spent time fiddling with the timing and vacuum advance and the electric choke setting. Our cars are 42+ years old, and were designed to run on leaded gas. This was very different chemistry from the stuff we get at the pump today.A spark plug produces a high intensity electrical discharge (the spark) inside the combustion chamber, igniting your fuel to keep the engine firing. EON5, OE004, OE004/R04, OE004/T10, OE006, OE006/R04, OE006/T1, OE006T10, OE111, RN10Y, RN10YC, RN11YC4, RN7YC, RN9Y, RN9YC, RN9YCC, BMW 2002 Fjord Blue Ireland Stage II • Bilstein Sports • Ireland Headers • Weber 38 • 292 Cam • 9.5:1 Pistons • 123Tune Bluetooth 15" BBS

The [ dated ] information I have is that the 7s correlated to Champion N9Y and the 6s correlated to Champion N12Y, specified for TR5/6 P.I. and TR250/6 carb respectively, by TRIUMPH. So my experience amounts to " going by the book ". The guy I was dealing with from Champion told me that they had a 10% failure rate straight from production Suggest posting a photo of your existing plugs as they came out ... a look at the threads can offer some information about whether you’ve got an appropriate plug. -KB In my day job I design special purpose blast machines, one of our customers in the 90's was Champion. I understand the generally preferred plug for TR5/6s is the NGK BP6ES, but note the BP5ES is specifically for use in lead free head - VUX's head is gas-flowed and unleaded.I'm not versed on " Stage XYZ " heads, but one of my BP7ES equipped engines with CP cam has 9.5:1 c/r and the other has 10.7:1 with high lift ( 0.504" ) / 282 degree duration cam. Heads are both Racetorations produce ( caveat emptor! ). I have used Champion RN9YCC plugs in my Minor for some time without problems. Currently NGK BP8ES plugs are fitted. Switched to hotter BP5ES and Regular gas ......and now it runs better than ever and the plugs are picture perfect after 1,000 miles. Suitable for any points type ignition system, our Powerspark Electronic Ignition Electronic Kits, and other electronic ignition systems. I recall that one-time prolific poster on this forum, 'bmcecosse', told a tale of a mate's car that wouldn't go.........they tried a few things and in the end Roy substituted the NKG plugs for Champion and the car fired up first time. He then threw the NKG plugs into a neighbouring field!