Hi I wonder if anyone can help. I have just bought my first bike, a Suzuki GSX600F 1989. It rides all ok, appears to be no problem with anything. There's just this funny noise, that I can only describe as a knocking from the engine area, I am quite mechanically minded, and have stripped and rebuilt many a car engine, from 4 cyl up to yank V8's - but this is my first 'go' at a motorbike!! The noise sounds a bit like a big-end rattle, but higher than I would have thought (but then, I am used to car engines!) - The weird thing is, it makes the noise when I am sat on the bike, or when on side stand (with cut-out immobilised), but as soon as I put it on the centre stand it goes completely I have checked, and adjusted the valve clearances, checked for anything loose, but found nothing. Also, the oil light goes out immediately the starter is turning, so I would not think oil pressure was a problem. It does seem to be an engine noise, but I can't figure how it stops on Centre stand? Any ideas? this is driving me crazy