Originally Posted by keavze
that much shims for 16%?
Sounds a little weird but it is true. A lot of people have tuning problem and glow plug failures (on Picco engines) because the thickness of shims is not correct.
Therefore, if cannot find a correct setting on carburetor and plugs, think about the shims and it does help.
Actually 0.3mm head shim thickness is Novarossi standard.