[cooperino]

Originally Posted by J-Mech

I'm also a bit worried they may create a flame that will burn a piston. The design of of a plug creates a consistent burn. A "better" spark may ignite the fuel too quickly and while it may appear to give a power increase, it's detrimental to the life of the engine.

I'm kind of thinking this through as I post trying to come up with a good answer as to why it appears to give a power increase, and why that isn't necessarily a good thing.

From what I am reading online. Its not a good thing for these smaller engines. People have described exactly what your talking about. The iridium plugs have a much smaller electrode and wire. I am reading and it makes sense that the smaller tip "electrode" requires less energy to achieve the same spark or better. With this better spark people are getting some degree of pre ignition and while it appears to give some more power it is usually short lived. There were other tales of problems when running them for extended periods.

I would post findings here but i looked at about a dozed sites and all said close to the same thing.