I just bought a 04 flhr efi model. It has added Stage I breather and se Stage I slip-on pipes. Bike has a slight pop/miss when throttle is turned up on take-off. Can I adjust computer?

Just twist the throttle (LOL)! Assuming you have EFI and you are talking about changing the rev limit you will need a laptop, screaming eagle race tuner software and the connector block unique for your bike. These can be bought online or at your local H-D dealer. You can then change many parameters, including air/fuel ratio at particular rpm's as well as the rev limiter setting. There are other ways to do this, but this it what the manufacturer recommends.

If you need further help, reach me via phone at https://www.6ya.com/expert/david_1f7d1c330c9dd97d

Did you pull up any error codes?

If so, what codes did you get?

hello parkav13... are you getting BACKFIRE from the exhaust pipes OR a "cough" from the air cleaner?

I think you need to cover all bases.Check out all ign stuff distributer electronics an stuff.Does it have stage I ign.?Also where is the miss?out pipes or breather?Check voltage to plugs and maybe change plug heat range.Don't forget fuel pressure at throttle body.

I am taking it that this is an EFI bike? Your timing specs are contained in the MAP your ECM uses to control AFR and timing at various RPM and conditions. You would have to purchase the Screamin Eagle Race Tuner (SERT) to read this information. Unless you are using an after market controller (fuel and or timing) device.
If you are looking to make this timing adjustment yourself...be very careful, burned pistons, etc. cost a whole lotta money to fix.

my friend has the same bike and wanted to do the same but unfortunately the exhausts have a catalyst in them so if he had altered them they would fail the mot. best bet would be to buy an after-market slip on silencer etc. hope this helps