rustedandweathered
Member
Am running the Gx 440 on 1/4 mile...Stock...Gas...What is the best spark plug for it ?
I think the compression ratio should be taken into consideration when choosing a plug. A stock, clone, with its 26 1/2 cc head could run a hotter plug than an engine with less CC's. How many CC's in the combustion chamber of your engine?I run a BPR7ES, but I'm on the asphalt for 12-15 minutes and we built a bit more heat therefore the colder plug. I change my plug cap out to a regular silicone one and run the R plug for reliability. While the non-R plugs work fine they can cause interference with scoring systems and such.