They're stock iridium' from a 2022 Susuki Vstrom, checked during 6,000 Km service interval inspection. 2,500 Km ago I replaced the stock muffler with an aftermarket that has very little resistance/back-pressure in it. I'm aware but far from from an expert on how cam overlap & muffler design can effect the air/fuel burn, but I don't understand why the O2 sensor can't compensate for this.
The reason for my concern, other then the light greyish plugs, is the sut/carbon inside the mufflers. The stock muffler had a modest but obvious amount of this. The aftermarket has almost no sign of it.
Do any of you gentlemen think there's reason for concern?
I should mention that I greatly appreciate just a bit more exhaust note for shifting. So much smoother & don't have to take my eyes off the road to watch the tach.
Thank you!
The reason for my concern, other then the light greyish plugs, is the sut/carbon inside the mufflers. The stock muffler had a modest but obvious amount of this. The aftermarket has almost no sign of it.
Do any of you gentlemen think there's reason for concern?
I should mention that I greatly appreciate just a bit more exhaust note for shifting. So much smoother & don't have to take my eyes off the road to watch the tach.
Thank you!
Last edited by a moderator: