This note accompanies Stemler pistons: 
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 Es ist ein Laufspiel von 8 - 9/100 mm zu empfehlen, da es sich
 um italienische Kolben handelt. Die Ausdehnung ist größer
 als bei den alten Original-Kolben, bei Betriebstemperatur.
 Möglichst sorgfältig und lange einfahren.

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 Translates to:
 --------------

 It is running 8 - 9/100 mm to recommend, since it is
 Italian piston. The expansion is greater than the old
 original piston, at operating temperature.
 Run-in as long and carefully as possible.

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 They mean:
 ----------

 The piston clearance of 8 to 9 hundredths of a mm (0.08 to 0.09mm) is
 recommended since these are Italian pistons. The expansion is greater
 than the old original pistons at operating temperatures.
 ( Adler specification was 0.03 to 0.06mm )
 Run them in as long and carefully as possible.

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