Join Date: Nov 2009
Location: Sterling Heights, MI
Was it working good previously, and suddenly now having problems? If so, I agree with the Seafoam suggestion. You might also want to try Berryman's B-12 which is a good carb cleaner. I suggest adding to the fuel, running it down for 10-15 minutes to make sure the chemicals get to the carbs. Then let sit for an overnight or 2. And repeat. But don't let it stay in the gas/carbs for an extended period as it might affect the rubber seals inside. I found that just adding cleaner to the gas and running it down didn't quite do the trick. After doing the above for a few times, it was much better.
Also, check the air filter and given the bike's age, you are due for a fuel filter if not done recently. When you replaced the plugs, did you set the gap on the new ones?
If this problem only happened after installing the new pipes, then I also agree that you have to change the jets.
2006 Shadow Spirit 1100
2011 Victory Cross Country