Yamaha f250's idling

My buddies yamaha f250's idling, curious if his is a symptom of the exhaust corrosion

[@davidvallecilloaguilar3270]

What was the problem?

[@meanmug78thestonedtitan5]

Was the problem ever discovered?

[@bg56126]

Meanmug78 The Stoned Titan I’d love to know as well. I have an engine that runs great but bubbles more then the other and has me worried.