Modern Vespa

Looking to replace my NGK with a new plug keeping the old one as a spare, whats the best on the market today, i must admit a leaning towards Nippon Denso's because they have served me well over the years on Lambrettas but are these the best for the GTS or some other make, a code for the plug would be good too, many thanks, buster.

Keep the original plug. It's got two earths. The engine runs badly for some reason with iridiums.

Thanks for your reply Dougl, I keep reading differing opinions about iridium plugs, some love um some hate um, did you run one your self or has it come from elsewere, buster.

Ran one in a 250 which uses a single electrode NGK standard plug. It felt like it was running strangely so replaced it with a standard 300 EKB plug.