In the video, now that's how you troubleshoot ignition troubles. Shut the lights and it becomes that much easier to see.
Any idea why the plug cracked? I can't say that i like seeing this. I am guessing last year's gas?
Absolutely no idea. I’ve never seen a cracked plug before, personally. And previous owner says dealer put these in Jan of 2020. He also says all non-ethanol gas, but not sure of the vintage of the fuel. Did the sniff test on it when I bought it and it passed the olfactory mustard.
My first ride out was mid RPMs after warming up on a lake with about 4” of snow. Nothing crazy, as I went from hard pack (lake trails) and some open riding. Minnesota is insanely low on snow right now, so nothing deep at all. I rode maybe 15 miles that day with my 4.5 year old in front of me (so not fast at all). That is the first time the problem showed it’s face, and it got better for a while after letting it cool down. The more I think it over, the more I think it is a manufacturing defect on the plugs. I think they slowly failed, and then finally failed on me this last time and that is why I could see it on the outside. Either way, I’m hoping this doesn’t happen again.
Because I saw a few others telling a similar tale, I’d just advise them to swap plugs regardless of condition at this point. There are maybe 3-4 other stories on this forum with similar gremlins, and people had various success figuring it out. I’ll for sure post again if this fixes it after some real mileage.