Iridium plugs , large gap

[AVOCET]

Yesterday and today fast taxi test getting ready to fly and i noticed rough running on the mag check ,

 

Im using iridium plugs and didn't check the gaps , they were about 028 thou ,

 

First time I've used iridium plugs NKG , and thought the gap looked excessive ,

 

Regapped to 022 tho . all good .

 

 

[jetjr]

Apparantly they are supposed to be like that ??

 

gapping them its VERY easy to break electrode Im told

 

I have dropped one before and fixed no probs

 

 

[AVOCET]

On the nkg site , they say to gap to manufactures spec .

 

They say the large gap if for performance ignition systems and to add 004 tho per 50hp over standard ,

 

Like wise reduced gap to jab specs .

 

 

[Dafydd Llewellyn]

Anybody have experience with them in a 582?

 

 

[M61A1]

Anybody have experience with them in a 582?

I tried them because an engine I bought came with a spare set, I really didn't notice any improvement. They appeared to perform exactly as standard ones, they seemed to collect buildup at the same rate too.

 

 

[dazza 38]

I fouled the plug on my Yamaha WR426 , which was quite common with the pumper carb. I switched to a Iridium plug and I never had a problem after that. They are expensive and I have heard stories of the electrode breaking off, but I have never had a problem with them.

 

I never adjusted the gap but as mentioned by Avocet, NGK do recommend gap adjustment.

 

 

[jetjr]

On the nkg site , they say to gap to manufactures spec .

Who would have thought to read instructions!!!