Maintenance is much easier than the inline 4s from across the other ocean. The valves are shim adjusted and require the cams to be removed to change the shims. This is not near the problem it is on some lesser brands because Triumph uses an idler shaft so you don't have to restring the cam chain when you're done.
The oil filter is located below the engine so there is little or no mess changing it. You do have to be careful to use the correct size filter though, there is another one that will work but it is too long and can be punctured by road debris.
The factory installed chain requires occasional cleaning and it should be sprayed with chain lube at least every 300 miles. Every second tank of gas is a shorter interval than that, but better more often than not enough.
Access is good with the tank and seat removed, and those come off easily.
There is a factory manual available as well as a Haynes aftermarket one. If you can, it's best to get both because the Haynes has better pictures of how things go together, but the Triumph one is more accurate on specifications.
