I have to say that this thread has been very informative but I don't see whatI'm looking for. Can anybody tell me why my .47 will scream like a banshee with an idle bar pllug but won't run for crap with an OS8? The idle bar plug lets this thing just tear up the sky. When I put the OS8 into the engine it won't go past half throttle. I'm really perturbed to the point of getting rid of it. Problem is, I don' have the cash flow right now and don't really want to buy another motor yet.