After my OS 30 gets going and I let off the throttle, the idle speed goes way up and it makes a whe whe whe whe noise instead of an idle. Sometimes it eventually does idle, but it usually just stays in its whiny state. I have figured out that it is not a HS problem and am gonna take off the carb and clean it tonight, but if anyone has ever had a problem like this and knows how to fix it, tell me because this has been a problem of mine for some time. If need be I will post a video tomorrow of the problem and what it sounds like.