81 CB750C chain noise

[gjantzen]

So I've sprayed lube onto the chain, and in no time it still gives off a quite loud rattling sound when I ride. I'm a noob, but would like to learn how to do my own repairs, so I'm just wondering if someone could point me in the right direction, diagnostic wise. I have a manual on the way and am thinking about taking the chain off and making sure its on tight enough.

Anyone have any additional thoughts?

Thanks!

[free2ride]

real stupid question back that may insult your intelligence [that is not my meaning]: is the chain rubbing against/hitting the guard [if you have one, of course].

[gjantzen]

Thanks for the response. No, there is no friction from the chain guard. It's definitely chain or gear noise coming from the chain area. I'm going to look more into it today and post if I find anything.

[OTTODOCTOR]

Probably worn sprockets / chain . -- If it has more than 20k miles on it , replace them . -- Quieted my 81 custom down instantly . -- In my case , p/o had replaced rear sprocket only , and the noise was coming from the countershaft . --

[rm56]

Check the sprocket teeth for wear. Pull off your chain, turn it sideways and hold it up like a belt. Make sure the links face the ground.  A good chain will only droop a little. A worn chain will point at the floor in a 90 degree bend. When you have checked that then adjust the chain tension for 3/4-1 inch of play. I have rarely seen it but sprockets can also be bent. A rattle sound tells me your chain is loose and is hitting the swing arm or worse the engine casing. I saw one come off a 750 Suzuki, it punched a hole in the guys engine case..oil everywhere. Not good. And that was just after leaving a motorcycle repair shop in Kileen Texas.