I've got an '82 Yamaha XJ 750 Maxim. I rebuilt the carburetors this weekend, and after putting it back together, it seems like it's got a vacuum leak. There's a loud squeal every time a cylinder fires.
I noticed it was coming from one carb body in particular, so I sealed the rubber gasket... thing that connects the carb to the engine block with some Permatex silicone gasket. That reduced the noise at idle a lot, and the noise is completely gone when revving/accelerating.
After getting the engine speed up, it takes quite a while to settle down again. Sometimes, it actually races itself up higher and higher instead of settling. Needless to say, I'm not riding it right now.
Any diagnosis, and what I can do to fix it? Thanks in advance.