Modern Vespa

can anyone tell me what plugs are compatible with my scooter?the manual says that i should use a Champion RG 4 PHP,altho i came across a site that said i could use an NGKIRIDIUM.can anyone confirm?

"Should" trumps "Could" in my opinion. If the manufacturer says Champion, then I would use the Champion.

I installed the NGK Iridium and have no problems at all. Runs great!

I set up a group buy here a few months back and I am using a Denso Iridium. If you look for that old group buy post you will see actual model number info too.

For years I ran Champs in my 2 strokes, but they kept fouling, so I tried NGKs and they stopped fouling.

I have a champ in my GTS, but I plan on going NGK next.

As for going with what the manufacture says, I wont ever use Savas again.


Find one you trust and works for you is what Id suggest.

Manny

Odd opinion!

The owners handbook lists an NGK alternative. They are more expensive than Champions. Probably more of a manufacturer cost-cutting exercise!

NGKs tend to run slightly better than champions IMHO.

The stock Champion in my GTS fouled after 4000 miles. Replaced it with the NGK CR8EIX. Same heat range as the Champion. 500 miles and running fine.

Link to group buy with model numbers.

I Was wondering this myself. My manual doesn't state an alternative spark plug. What would the NGK equivalent to the Champion RG4PHP? I was looking online for prices of the RG4PHP and they are pricey too.

Thanks,
Cat

I supplied a link above that I would highly recommend reading.

Whoopsies ... Thanks!

I found that the original Champion plug in my Quasar engine was gapped at about .015 in, but the manual says to use about .025 in. I regapped mine to .025 in, but can't say whether it provides better performance.

Cheers,
Bob

I will personally never use anything but a NGK or Denso Iridium plug. They are a little more but still well under $10 a piece.

after about 8k I switched to the NGK and have had no problems. to find a cross reference access the NGK UK site and type in your scoot model.