Stripped thread on exhaust stub

[Mr. Ron]

...Bostik Never-seez Regular:
-Aluminium
-copper
-petroleum distilates
-hydro-treated heavy napthenic
-residual oils (petroleum)
-demaxed solvent
-synthetic graphite
-zinc oxide

...These are the ingredients from the can. You can also get a high-heat silver grade, but i don't have a can at the moment. I had to remove my r/h pipe for an oil-filter change. After 8000 miles, all threads were lined with copper. Removal of the nut was a little-bit tight, but didn't require a wrench
after the first gunt. Threads were easily cleaned with a copper-wire brush and looked like new in no time.

...John, i recently had the exhaust threads renewed on one of my heads last year. The machinist did a brilliant job, boaring out the old threaded insert, machining a new insert from aluminium pipe and pressing it in. The job looks flawless, no welding and better than new.The prices for me in Canadian is:
-dual-plug 2 heads...$170
-port and polish...$200
-repair one exhaust thread...$180
-new valve-train...100 pounds (aprox.$250??)
-Assembly and grind...$160
-The look on my face first time starting my bike...priceless