Sherwooddavid
Good Day Everyone, When I was checking the oil level today in my 20kw genny I noticed the small round opening and just wondering what it was used for ? Just curious 😊

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78buckshot
This line of engines has been in production for twenty years, before the throttle was controlled by the electronic governor it was a mechanical governor. The whole with the expansion cup in it was the entrance into the crankcase for part of the mechanical linkage.
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Sherwooddavid
Thanks 78buckshot that makes sense. 
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