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You will find it is generally a well engineered thing, most of the weak points are electrical.
There are many threads here concerning ignition pick up coil failure and HT coil failure. Pick up coil problems usually involve the bike cutting out when its warm and re-starting when its cold. HT coil problems bring about rough running.
There is a bolt in the alternator drive which is prone to failure, it will manifest itself as a rattle from the top left of the engine when it is idling. Triumph have a kit of re-designed parts to fix it.
I get thoroughly bored with the brake calipers, they are forever seizing / binding. Either the sliding body binding on its pins or a piston binding on the dust seal. I have that problem right now and it needs fixing (again). It is one thing that puts me off uprating the calipers, twice as many pistons to seize as there are now. (dont have this problem with the Lockheed or Brembo calipers on other bikes). This is on a bike that is used every day.
You may find that on a bike of that age that the rubber petrol pipes and vacuum hoses will have hardened and may leak or split when you disconnect them, that may cause bad running or cause the petrol tap not to open due to poor vacuum.
I have had trouble with wear in the carbs, but parts were replaced and it is now OK. Mikuni carb. bikes are thirsty, expect low 30s mpg.
I have also been through several sets of wheel bearings over the years, but they are easy enough to replace.
I have not modified my bike, it is still largely as it left the factory (apart from some grime and rust).
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