The engine will run with the balancer removed, also. I'm hearing a squeal from a tight main bearing that is about to lock up for some reason. Don't run it much more before you dig into things and find the source of the noise.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!