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Started getting a small backfire when de-accelerating on a closed throttle. The bike gets used one or twice a week, so it is not sitting for long periods. Possibly Plugs or coils? The bike has 65,000km on it and is serviced yearly regardless of kms. The spark plugs are due for replacement, so I am going to replace them anyway. Any suggestions? Or should I just go with whatever my honda dealer specs?

Hello All, Need some help removing spark plug from cylinder 4, I think (left front). The socket seems unable to get a grip. Almost as though the hex on it is stripped, or something. It just jumps off as I turn, no matter how much downward pressure I put on it. Of course being the most awkward plug to remove on the bike doesn’t help! Had to dismantle most fairings and right rad to give enough room. Who would have thought changing plugs required removing the mirrors... Plug was installed less than 200 miles ago with copper ease so it is not seized. I just can’t get any purchase on the blasted plug. Something must be be wrong as the CBR coils I installed successfully on the other 3 plugs will not install on this one. Almost like it is sticking out a bit more than the others, not allowing the coil to seat. Took a couple of pictures but cannot make anything out of them: Has anyone else experienced something like this? Any advice on getting the plug out? Thanks in advance, Stray