Adjusting valves is not that difficult: apart from a few wrenches, all you really need is a feeler gauge, a little brain power and a lot of patience.
Shaft seals need to be fitted carefully. Where do you get the right sleeve if you don’t have a lathe to hand?
Once the cylinder head is bare and empty on the workbench, the new valves have to be ground in: Real manual work.
Oil stains on the main parking lot? Could be due to a leaking oil pan gasket: a flaw that can be permanently repaired with paste.
All sorts of things can be done to coax stud bolts out of their threads. If the bolts are not too tight, simply counter them with two hexagon nuts.
Cleaning the jets in the carburetor or injection system?
A scrap of stranded copper wire is the method of choice.
