Hey Guys,

I have a Plus-4BTT WC. Barely a gallon through it. Running Byrons Gen2 30%.

How do you know if you should run a cooler plug? This past weekend was the warmest (by far) day we've had and the first race day I've raced it. I started out with a C6TGC for first qualifier and the temperature outside was probably around 75 degrees. By the 2nd qualifier it was at least 85 so I changed to C7TGC.

When I took the 6 out (which is still the orginal plug that came with it) the tip of the filament had quite a bit of black stuff caked on it. I assume it was from break-in running rich but I'm not sure. Filament itself looked ok.

Would you have recommended the 7 or stick with the 6? Do you require any tuning changes with a glow plug change?

Thanks,

JJ