A Sound Question

So here's yet another sound question, but I don't have a recording of it yet.  I've just started to notice when I start the bike in the morning there is the normal startup, but as soon as the engine catches the I let off the start button there is a "left over' sound, like a spring unwinding or something is the best I can describe it.  It is a quick sound, easy to miss, and like I said it happens right after I let go of the button.  I'm guessing the starter clutch or flywheel, but is this an engine out, don't use it until its fixed thing?  I don't really know what could be wrong inside there, I put new springs and rollers in 2 years ago when I replaced the tensioner and chain.