Jabiru 3300 starter problem ?!

HiHo,

A new problem occurred these days. 

The starter motor turns freely (powerfully), but the gear does not engage? The battery is new and fully charged (because I initially thought it was old and weak). I removed the starter and cleaned the gearbox (pictures). Everything moves easily and nothing is stuck. Nevertheless, the small gear does not engage when starting. Ah and it is worse when cold. If the gear catches sometimes the starter turns and start easily the engine. I don't understand. There are no broken teeth or anything bent, no sticky oil. Everything moves properly when disassembled. What could it be? Does anyone have any ideas? Thank you all.

 Steffen

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