What happens when you have a bad spark plug?

[INTP_ty]

I know on my snowmobile, it'll skip or misfire. I've never had the plug FAIL so it wasn't drivable.

How about on one of these motor bike kits? Loss power? Misses at high speed? Doesn't start?

 

[FurryOnTheInside]

I seem to recall that it isn't good for CDI if it fires off into an open circuit. But apart from that idk. You've been through the no start check list?

 

[crassius]

usually, you won't get it started because the ignition is very weak at cranking speeds