Motorcycle Repair: 1998 Honda Magna VF750 C2, honda magna 750, vacuum hoses

Question
My bike is popping and banging on one cylinder on left side.I put new plugs and air cleaner in.sometimes the cylinder fires ok.What could be causing it

Answer
http://www.bikebandit.com/houseofmotorcycles/1998-honda-magna-750-vf750c/o/m1514
#25 air cut valve. It is also called an anti-backfire valve..... Left front carburetor.

I would also check the spark plug caps to see if they all have the same resistance values... around 5k ohms.

Check all your vacuum hoses/connections and things that attach to vacuum lines.

Bill Silver