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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?
 

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Poppong

I get a little from my stock Liner. We often see people asking about popping, I guess the level is key but, I think it is normal. In fact I kind of like it.

Dave
 

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I get a little from my stock Liner. We often see people asking about popping, I guess the level is key but, I think it is normal. In fact I kind of like it.

Dave
The culprit is the AIS system. It's still pumping air into the exhaust. You can plug it, or even remove and cap it off. There are kits available.

I just plugged off the vacuum line and plugged the air line. Hugh difference. There used to be a link with instructions for removal of the system on vstar1100.com. I can't get the link to work now,
 

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Discussion Starter #4
Plugging AIS system

The culprit is the AIS system. It's still pumping air into the exhaust. You can plug it, or even remove and cap it off. There are kits available.

I just plugged off the vacuum line and plugged the air line. Hugh difference. There used to be a link with instructions for removal of the system on vstar1100.com. I can't get the link to work now,
What did you plug them with?
Thanks for the info
Mike
 

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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.
 

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What did you plug them with?
Thanks for the info
Mike
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. :D
 
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