My wing at start up has had the horrible sounding knock that only lasts a second. This has happened twice and the bike had been sitting on the side stand for about a week each time. I know some have had this happen and suspect oil getting into the combustion chamber causing a sort of hydraulic lock. I wonder if you guys that have had this problem have aftermarket front springs? I noticed my bike leans more with the better springs in the front. My fork tubes are raised 10 mm. I think how the pistons end up at shut down could also play a part in this and oil getting past the rings. By the way, I did notice what could of been an oil smell right after this knock. I think if this is indeed a hydraulic lock, however brief, is not a good thing and could cause great harm to the con rods, bearings, etc. Any thoughts?