turns out it was the power valves! you know your stuff,I had the powervalve stick on my 200exc. It was all covered in carbon. It was like having no power. your symptoms are correct.
needs new top to, you also know your stuff,Air filter clean? Have you done a compression check latly? When was the last top end? How long has it done it?
I had the powervalve stick, so i took the top end apart and did both at the same time. After this, I used amsoil interceptor oil, and the powervalve stayed clean.turns out it was the power valves! you know your stuff,