Hi Pope
When I got mine the crank cover was loose and so was the carby.Maybe this was on purpose for some reason.Anyway there was no swarf as far as I could tell.I ran mine in as per instructions and it only took a couple of 4 oz tanks, but I will run it rich in the plane for a while.Incidently, their claim that this engine is much lighter than an average 40 is dubious, mine weighs only slightly less than my OS 40 FSR.It certainly isn't a fuel guzzler though- very economical!