The one on the left - Baaahd. The one on the right - Gooohd. At least on a 10V. The slightly smaller tip is often recommended for the 20Vs because it reduces parasitic sparking to neighbouring cylinders.
This one's always bad. The centrifugal weight (no nit-picking about centripetal) will limit rpm before the ECU. In like vein - a fuel pump relay with "Kraftstoffpumpenrelais mit Drehzahlbregrenzung" has a similar effect. See the note below the next picture.
This one's just taking the piss.
The incredible thing was that the car ran. I pointed out the detrimental effect to the (selling) owner and he got quite narky - "Put it back and don't touch anything else." Then I sat in on a test drive, with said owner saying to potential purchaser: "All these cars are a bit gutless above 5,000 rpm". The new owner got another 15mph on the top speed for £3.15 at Halfords
A car like this is a great deal for the buyer - a rotor arm like this (or indeed any other manifestation of limp home mode) suggests strongly that the engine hasn't been thrashed, and a significant performance boost is available at very low cost.