![Piston pin](https://skygear.cz/451-large_default/pistni-cep.jpg)
Piston pin for Simonini Mini2plus, Mini4 and others.
Always check your piston pin, when doing maintenance.
When it gets purple/blue color, or you find any scratches on it you should change it and also change the needle bearing.
This happens when your engine runs on too high temperatures or if you don't put enough oil in your gasoline.
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