My recently purchased 03' V star 1100 Classic has cobra slip on pipes. I purchased this bike from a broker and have no service history. Runs great but pops and backfires (slightly) on decel. I just had some service done and the mechanic told me this is normal for those pipes. That being the case, I'm fine with it. Did he tell me true?
I forgot to mention AIS. Air injection System. Air is injected into the exhaust to help burn off unburned gas. This link should get you to a site that talks about it. I don't think your 03 had a catalectic converter but it still could have gotten louder.
Backfiring is a byproduct off the motor, timing and the fuel system have a lot to do with it also. Removing AIS will knot stop backfiring but it will lesson it. I have a 06 1100 and I have removed the AIS system and I will still get some backfire.
What did you plug them with?
Thanks for the info
I actually just used a short piece of wooden dowel inserted in the air line, then hooked the airline back up. The vacuum line then is moot, because air can't pass anyway. Still, I used a rubber vac line cap at the carb.
I still had SOME backfiring and popping, but I was running straight through inserts in my hardkrome pipes. I couldn't ride more than an hour without splitting headache. I bought and installed some hard core quiet baffles from www.smartpartz.com. The best $69 I ever spent. Restored much needed back pressure, mid-range torque, and though quieter than before, still authoritive.