I changed the oil in my primary and now hear a loud screeching noise when I get off the throttle from the left side of the motor. I have heard this noise before but never this loud. Used Harley primary / transmission oil that the local dealership recommended. The primary chain has about 3/4" travel at the top when cold. Has anyone else had this problem? Any ideas on what it can be?

 

Your drain screw could be too deep,hitting the chain.

 

I checked the drain plug. Doesnt appear to be in too far. It is located directly under the clutch on the back of the primary cover. Not sure if the chain could rub on it where its at.

It only makes the noise when first getting off the gas momentarily.

 

Your compensator nut could be loose. I had that problem one time when mine wasn't tightened properly.