the secondary/ rear cylinder on my bike is maken a weird nose.
im not sure if its the valves or the piston. The bike has has new spark plugs so I no the problem cant be the plugs. There not foweled. Can any of you tell me what you think the problem may be??? I can make a video of it an upload it to youtube if you need.

 

This is on a 1996 Vulcan.

 

Need more information: Idling? Acceleration? Metal to metal sound? A "tapping" sound or a "ringing" sound? Constant or only when firing? Pull the plug; does it look OK? Deposit color? Where exactly is the sound coming from; high/middle/low on cylinder...etc. ??