cylinder

I just recently did spark plugs, kn air filter, oil, carb rebuild, and seafoam. Bike is 2006 with 8500miles. The left cylinder pops when the bike is leaned to the right. Is this something serious or just the normal pop I've heard on this forum that the bike has? YouTube.com

The internet has proved unreliable for my search so I thought to ask the all mighty ones. I have a 2007 ex500 project and whilst I repair it I thought while the engine sits on a table I look into Nickasil or nickel silicon carbide plating. It’s used in race bikes to reduce friction and it’s...