Ok... Pull the group valves and then inspect them. The pin edges must be smooth and flat and if they're not, you can either machine them or wet & dry them to to make them flat. If they're then too short, they will not operate correctly. You then either shim or replace them. Try the leva with them out. Inspect the cam for smoothness.
Lumpy lobes and wear along the shaft = time for replacement. I tend to pack the bush through which the cam passes with lube and then use the shaft of the cam to ensure that the entire assembly including the seals are lubricated. I also add a drop of lube to each pin as I reassemble the group.
If after all of that it's still crap, something is wrong. Seals, valves, the bush and you start systematically replacing anything which hasn't already been binned.
There's no rocket science in all of this. Good tools will prevent any damage. Don't use ring spanners on anything!
Lumpy lobes and wear along the shaft = time for replacement. I tend to pack the bush through which the cam passes with lube and then use the shaft of the cam to ensure that the entire assembly including the seals are lubricated. I also add a drop of lube to each pin as I reassemble the group.
If after all of that it's still crap, something is wrong. Seals, valves, the bush and you start systematically replacing anything which hasn't already been binned.
There's no rocket science in all of this. Good tools will prevent any damage. Don't use ring spanners on anything!

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