Here is the Makita RBC2510 owner manual:
http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=manI doubt that it has a governor. It seems more likely to be a problem with the throttle cable sticking, or the clutch not engaging. However I stand to be corrected. (I've never actually found a governor on a tiny 2 stroke engine - usually their lousy scavenging limits their high speed performance sufficiently to keep them from bursting. The port timing is set in the first place to give the desired performance.)
