I got a old OS 90 2 stoke on a plane I got at an action. The engine was running a little stange and we narrowed it down to a broken idle screw components. On this engine, a piece threads into the engine and the idle screw threads into it.

I am not sure how old this engine is or how to find a replacement part. Any help apprecited.


The part kinda looks like this, but screw is not black:
http://www.ronlund.com/images/os_engines/osmg8544.jpg

Thanks