Modern Vespa

What NGK plug have any of used for a Malossi 177 kit on a P125x? Malossi says an Iridium IW 24 or 27. Not sure if it matters but I am using a SIP 2.0 muffler with this kit.

https://www.sparkplug-crossreference.com/convert/DENSO_IRIDIUM_PN/IW24

https://www.sparkplug-crossreference.com/convert/DENSO_IRIDIUM_PN/IW24


That looks about normal to me a BR8 or BR9

A 24 in the Nippon Denso numbering system is equivalent to an 8 in the NGK system. A 27 in the Nippon Denso system is equivalent to a 9 in the NGK system. In both cases, a higher number corresponds to a colder plug.

I put a Malossi 177 kit on a Stella last fall and have been using either an NGK BR8ES in warm weather or a BR7ES in cool weather. I haven't noticed much difference between the two. I doubt you would need to consider going as cold as a BR9ES.

Remember, the Malossi 177 kit requires a long reach (19mm) plug.

Thanks. Good info. Yes I noticed that the kit uses a long plug. I have not looked into this yet but the plugs you listed above I am assuming are long reach?

Thanks again for your response.

Yes, the "E" refers to extended reach.

This might not be up to the minute in terms of NGK's latest tech but it should cover most of what's out there.[/img]

The 9 plug causes very erratic running IMO; it actually behaves like you are bogging rich at low revs, its far too cold unless you are thinking of going on a 100 mile rally non stop driving. I have three plugs to hand for my kitted PX in heat ranges of 7, 8 and 9. The 7 is great for bursting around town and 10 mile journeys; ive been using it since xmas as its been so cold. I stick the 8 in for longer runs, such as 25 miles or when the weather warms up.