Modern Vespa

I couldn't find any definitive information on this, so thought I would ask the experts before changing out my spark plug. I got two plugs from scooterwest, both NGK, one CR8EKB with twin electrodes and one CR8EIB-10 iridium.
My question is do I need to measure the gap on these or just pick one and put it in? Also, suggestions on which one to try first.
Yesterday I did a belt change and finally made the switch to Dr. Pulley sliders.
Thanks

This is from the manual (below), speaking to copper plugs. I don't recall anything specific given for gap for the iridium plugs... but that was what I installed. Been long enough I don't recall how I set it or if it even needed it.

Characteristic
Spark plug
CHAMPION RG 6 YC
Alternative spark plug
NGK CR7EKB
Electric characteristic
Electrode gap
0.7 ÷ 0.8 mm


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Thanks B24. I saw that in the manual, and did some searching on here and came across a post about not gapping iridium because it can snap off. I guess I'm just being paranoid, and finding an excuse not to work on the scoot while it is damp and cold outside.

My NGK Iridium plugs came with the correct gap but if you do need to adjust it only apply force to the outer electrode. The inner one may be delicate and you should not lever against it or force a tight feeler gauge.

Regards Roadster

Sent a PM with a cut from the NGK catalog, may be of help. Probably just unclear enough to let you continue to delay and not have to work in the wet weather...


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Thanks. Not wet today, just cold. I decided to just throw it in there and assume that it was pregapped correctly. What's the worst that could happen, plus I had a backup.

Scooter seems to be running fine.

Not so sure about my torque wrench though. I thought I would be safe and use the torque wrench to get the specified torque, 12-14 Nm, or ~ 9-10 ft-lbs. My torque wrench is one of the click type, and it just didn't seem to be clicking and I thought it seemed like I was putting a lot of force on it. I stopped before I broke something. Any thoughts on how to make sure my tw is calibrated or functioning correctly?

You can gap Iridium plugs and here is how you do it
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzMjAwMGRvY3N8Z3g6NGUxY2FlNmNkNTQwMjc1OQ
Just don't put "ANY"sideways pressure on the center electrode, and use a round wire feeler gauge.

ROD

That's a welcome addition to my maintenance library - thumb's up. Thanks for posting that!


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I use the NGK CR8EIB-10

I can speak to the CR8EKB...
Using them on different Scooters, and you just put them in, nothing to Gap.
Best place to purchase them is on Amazon.com, best price I have found.
They are my favorite, they really work well.

Plug should be gaped correctly out of the box. Good to check, but no adjustment should be needed.