Clyde

Hi recently brought a delightful 1984 gsx550 se with loads spent on it and i gotvit for a song, but there is an annoying enginetop end rattle. I've checked the valve clearances and then done what the book said not to do and twang the cam chain tensioner, it has made a little difference but if i hold it tight over it does go more quieter any ideas please. I need this on the road for next month as it becomes a historic vehicle thanks for any help.