There is a bearing and seal there. I normally remove the seal and replace it. That would not cause a poping noise though. Could be a bearing or ball joint which if the bike has been in the mud before bearings don't last long anyways.
The fill plug could be turned with vice grips if you get lucky. It's not much of a material and can break off easily. Most people don't understand honda uses metric sizes on everything. Worst case is drilling it out which would be a pain. Vice grips would be your best bet.
The fill plug could be turned with vice grips if you get lucky. It's not much of a material and can break off easily. Most people don't understand honda uses metric sizes on everything. Worst case is drilling it out which would be a pain. Vice grips would be your best bet.