I recently purchased a 2013 Speedmaster with 194 miles on it, that had been garaged practically since it was bought. It has K&N pod air filters and British Customs Bomber exhaust. It was running the stock aftermarket pipe OEM tune map. It had a powerful but abrupt throttle response and some backfiring through the intake, with power loss/sputtering when it happened.

Everything I read and opinion I got suggested that the mix was too lean at low rpm/throttle opening, so I tried a custom map that claimed to get rid of the popping/backfiring by enriching the low end. The result was better that the stock map, but it did not solve the back firing problem.

I read about TTP map 12 for America/Speedmaster, and after consulting with Mike I decided to buy it and install. The result was an incredibly smooth throttle/power response. The popping and coughing was still there though, after consulting with Mike again and reading the info on the TTP website on how to adjust the TPS and balance the throttle bodies correctly and reinstalling the tune map the problem was solved!
The result is an amazingly smooth ride!

I want to emphasize following the steps described on this site regarding checking the TPS voltage and throttle body balance before installing the tune and also installing the tune when the engine is cold. My local shop installed the tune on a warm engine the first time, they mentioned the TPS as a possible cause for the backfiring, but were not aware it could be adjusted nor did they check the voltage for it.

I installed the tune myself the second time following TTP instructions and it was flawless. My TPS voltage was .66V when it should be .6V and one of the throttle bodies was fluctuating by +20 hpa, the recommended is no more than +/-10 hpa. I mention this because as small as these changes were, it solved the problem.

I read many threads in forums about Triumph EFI bikes with backfiring/sputtering/carb fart issues with aftermarket intake and pipes, and every response was pointing at lean mixtureread more. I could be the TPS, it is extremely sensitive and could easily be bumped out of alignment.

Thank you TTP for the tune and the help!