Colin,
It's a common problem. Sometimes the bolts on the spigot work loose, unfortunately this usually means the gasket gets damaged so tightening does not fix. I tried loctite but unless you can really clean out the threads in the barrel it doesn't work very well with so much crap in that area. The spigot is Aluminium so does break easily. I broke 2 of them with a Gnarly pipe that is very tough and didn't fit very well. Although many people suggest using the LTR steel one I shied away from that on the basis that spigots are cheap and I would rather that broke than the pipe or barrel. More likely the bolts would shear off in the barrel though. So I decided I'll just replace them. However ... since using a Doma pipe which fits better and is thinner I haven't broken any.
I have also found the o-rings that seal the exhaust on often get pushed out of their grove when fitting the pipe. I now use Silicon RTV as well to help seal the pipe on.
Ian.
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