Originally Posted by doki_doki
Thanks
The dealer of the Novarossi engine here recommends that the CT7 plug be used after running in the engine. I was also told that the Plus 12-3SCT came with a CT5 plug. Should I stick to this plug rating? Thanks
It comes with a CT5 because you need a hot plug for break-in. My preference is CT6 because it has a bit more bottom end, but the 7 works good too. As AFM explained, plug selection depends on a lot of factors.