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It's not a balance chamber plug on a D1. On a D1 it's the turret bolt that serves the same function in holding the HP seat.I have Hog D1's and there is nothing on them called a "balance plug"
Thanks for your response. Definitely over torqued, and clean as a whistle inside. Have a pair used for stages, and the 2nd is the same. Tried two 6mm from DRIS`s reg service tool kit, both sloppy fit. I for sure need to replace the plug, so I'm afraid to destroy the plug in the second one. Gonna send it to HOG for service see if they have any advice, while l carry the 2nd reg around to find a properly fitting tool.It should be 6mm. A good 6mm. Not a crappy chinese made 6mm hex.
Note that if you frill it deep enough for the average easy out, you will need to replace the plug as you'll likely go through the bottom.
It also should only be torqued to 80-90 inch lbs. Over torquing is usually the reason for a seized plug. Either that or corrosion seizing it up because it was flooded, not rinsed properly after use for a long period of time, or as I said, over torqued.
I bought a Snap-On 6 mm hex socket for just that reason. The Craftsman ones I have are also good, but older and it gets to the point where I just don't take chances.Thanks for your response. Definitely over torqued, and clean as a whistle inside. Have a pair used for stages, and the 2nd is the same. Tried two 6mm from DRIS`s reg service tool kit, both sloppy fit. I for sure need to replace the plug, so I'm afraid to destroy the plug in the second one. Gonna send it to HOG for service see if they have any advice, while l carry the 2nd reg around to find a properly fitting tool.