Need some opinions.. have V&H slip-ons ont the fatboy (carbed) and like the sound ok, but seem to get a muffled backfire on decel. It mainly happens in mountain riding when using the engine to help brake. I have been told several times from people behind me it sounds really bad. I did not do the stage 1 kit and curious if that would help? I guess the other option to change to full exhuast and stage 1 but budget is tight.

Several people have said something on rides so has anyone had the same experience?

 

too rich, lower the slow speed jet or adjust the meter rod

 

also do a double check on your exhaust bolts/gaskets....

 

I have to disagree with this post. I say the bike is running lean. Idle mixture screw to the max if necessary or one up on the pilot if that's not enough. Oh and yes, first double check exhaust bolts for tightness like above post

 

my bike does the same thing. My buddies bike as well. I tend to think the bike is running a bit rich and the crackle noise is unspent fuel that detonates in the exhaust. I cant prove this but its just an opinion. I have the stage one on my bike as well. I am gonna get the bike tuned as soon as i can come p with the cash just for that. I could be wrong like i said just my 2 Cents

 

It's called exhaust reverberation. During decel your exhaust system will suck in cool air and mix with the unburned mixture in your pipes. It will be ignited as the exhaust valve opens and boom. Decel pop. It can be corrected easier with a richer mixture than lean making it too rich to burn while in the pipes.

This is more common with open or drag pipes than with other types. It will also happen when you use slip on mufflers with large baffles and the stock head pipes that contain a stock crossover pipe.

Suggestions to cure this with a carborated bike is to go up 3 sizes on your metering jets and test. For EFI systems you can simply add fuel to your map process at 0 throttle.

 

Yikes...

 

Yeah, I freaked too when I heard this from a tuner but he swears by it. Says the upsize really isn't that much. Sold my carb bike years ago running like a spanked monkey.

 

Thanks for the info... i wish this was something i could do. They dont give you the software for your pc with the tuner kit anymore. I guess so they can charge for a service call.

 

in higher altitude a carbed bike will run richer because the air is thinner. just to prove what way to go you can add a little choke. if the issue is still there then you need to go leaner

here is a good place to start. read and learn.
http://www.harley-performance.com/index.html