Thank you for comments!
Nevadablue, bwal74 I didn't work with plans, I've only made basic model in Solidworks. The throttle, oil inlet, spring valve casing was made without plans, with the idea coming out of my head. If anybody is interested, I can upload Solidworks model here.
Compressor man, here is a picture of all parts of the engine and throttle. It's absolutely basic throttle (just a valve with a hole)