So I've got a 96 CBR F3 that I recently purchased. It's got 33K miles. Today I changed the engine oil and put in 3.5qts of 20w-50 Valvoline Racing Oil. I also put in a little bit of Bars stop leak. (I've got a oil leak problem and can't figure out where it's coming from.) I also put a new K&N filter. Well when I start it cold it sounds fine but when I let it warm up it gets what sounds to be a little valve clatter from top right side of the engine. I'm thinking that when it warms up maybe that oil is to thick and it's starving for oil up top. Has anyone else had this problem. I just used that oil cause that's what I run in my quad. Any ideas? What do other guys on here use? Any help or advise would be great. Thanks.
Adrian

 

You have it the other way around. When the oil warms up it gets thinner.

I suspect that because the oil is getting thin as it warms up, your valves are getting a little chatter. Personally, I wouldn't worry about it. If its really bothering you, change to a thicker viscosity.