thanks. the cross reference site i was using told me NGK BPR5ES.but those where too long. i guess the ES has longer threadsThe resistor version of your plug is E5RTC
IMO, you should get an NGK instead. The cross-reference for that is BPR5HS (6222).
According to my research they all have the same reach. The old Greyhound 79 and Pred 99 took the same plug as yours, albeit with different heat ranges.
I have the same engine, and I'm interested in anything about it. But my understanding is that a resistor plug's advantage is that it produces less radio frequency interference (RFI). Is that why you want one?anybody know what resistor plug will work in my 79cc predator. the stock one is a E5TC Torch.