How do you adjust the cam tension for a fzx700s?

I have a Rare, 86' Fazer 700s and the cam chain is rattling i need to adjust the tension on it but i don't have a service manual. Is there anyone that can tell me were the adjust point is on the external of the engine?How do you adjust the cam tension for a fzx700s?my answer is try to check it out first on auto repair shop..