I've only owned one Triumph in my life, this 500cc twin.
It was modfied for scrambles racing and featured dual carbs, special cams, hidome pistons and other bits and pieces.
The previous owner spent quite a bit on getting the engine modified but it had very little power. He was very disappointed and wanted to sell it for 250 bucks.
My brother and I started looking it over and finally my brother, Ron, removed the cam cover. He noticed the cams were improperly indexed, with one cam being retarded 4 teeth and the other advanced 5 teeth.
We reset the cams and this little beast came to life in a big way. The mufflers shown were added whenever I took it out for a spin on the back roads. Wish I still had it.