1993 vfr 750 knocking intermittently at idle

My VFR has several issues, but in order to help others with similar problems be able to search and find solutions, I'm going to post seperately. Please tell me if this is bad etiquette. I purchased a 93 VFR a year ago with 60,000 miles on it. It runs great and has a good amount of power and great gas mileage. The problem I have noticed since I bought it is that it will sometimes knock at idle without choke on... It sounds like piston slap, and it goes away as soon as you give it gas. I have never noticed this at any other time other than when it is idling. I don't know when the last carb clean or valve adjustment was, but I'd bet its overdue. Any ideas?

 

What happens when you pull the clutch, could be just clutch rattle

 

Could be clutch, listen by the right engine cover and see if It's coming from there. It's quite normal, especially with those miles. 4th gen engines were notorious for a knock in the head at idle from low oil pressure. Honda deemed it normal and not anything to be concerned about, dont know if the 3rd gen is affected, however.

 

What oil r u running, and how warm/cold is your weather there ? Is knock louder with engine cold or hot ?

 

^what he said above. Right on the money. Balance your carbs and that noise will go away.