Genuine NGK BP6ES Spark Plug - silver/white

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In my day job I design special purpose blast machines, one of our customers in the 90's was Champion. In 1976 when I got my 1st '250 all of the parts store catalogs showed N9Y for all TR6 and TR250. After repeatedly fouling these I consulted the owner's manual which called for UN12Y. Fitting these or its equivalent ( Autolite 55 ) ended the problem for good.

I have used Champion RN9YCC plugs in my Minor for some time without problems. Currently NGK BP8ES plugs are fitted. Carbs: They're necessary and barely controlled fuel leaks that sometimes match the air passing through them.F000KE0P16, F000KE0P34, W175TR30, W200TR30, W6DC, W7DC, W7DCR, WR5D+, WR6D, WR6D+, WR6DC, WR6DC+, WR6DP, WR7D, WR7D+, WR7DC, WR7DC+, WR7DC2, WR7DP, WR8DC4, STK7500, STK7501, STK7594, STK7595

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. But coming full circle, you raise an excellent point and I will put in whatever plugs are currently in there and see how she behaves.No. Not connected. Just a couple of pumps on the loud pedal. I've run Webers on a variety of cars and only ever use this method. EON5, OE004, OE004/R04, OE004/T10, OE006, OE006/R04, OE006/T1, OE006T10, OE111, RN10Y, RN10YC, RN11YC4, RN7YC, RN9Y, RN9YC, RN9YCC,

I went to a BP5ES plug (slightly hotter than the BP6) and switched to 87 octane gas as another step toward reaching my goals. My biggest failure with a NGK plug was when the earth terminal fell off and was jammed into the top of the piston on my previous modern. That meant me taking the head off which had to have a light skim. Not a job I want to do again as half the car and half the engine had to be stripped to gain access. A spark plug produces a high intensity electrical discharge (the spark) inside the combustion chamber, igniting your fuel to keep the engine firing.

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Tom - a Stage 2 head is basically gas flowed and ported with slightly larger valves. Mine is approx a CR of 9.75.