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V7III Backfire on Ignition

Discussion in 'V7/V85/V9 Chat & Tech' started by Alec Goldstein, Jul 29, 2019.

  1. Alec Goldstein

    Alec Goldstein Just got it firing!

    Sep 30, 2018
    Likes Received:
    Washington, D.C.
    Since removing my evap cannister I have noticed a loud backfire when I start my bike - it seems to happen maybe 25% of the time. Is this normal or something I should deal with?

    I have my sas removed and Todd's exhaust and flash on the bike.

    Thanks in advance for any help
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

    Oct 28, 2008
    Likes Received:
    Huntsville, AL
    I suggest you contact Todd direct. The map may not account for the canister removal if you didn't tell him that would be a condition of the bike.
    Mayakovski likes this.
  3. Roose

    Roose Tuned and Synch'ed

    Oct 5, 2018
    Likes Received:
    Double check to see if the map is active/loaded. Should have an aesterik next to the fuel map that is loaded. Mine starts with a rush and immediately settles down to a nice idle.
  4. Godfrey

    Godfrey High Miler GT Famiglia

    Oct 1, 2017
    Likes Received:
    San Francisco Bay Area
    • Be sure that there are no intake or exhaust vacuum leaks resulting from the EVAP system removal or the installation of the new exhaust system.
    • Be sure that the SAS bypass widget is properly connected.
    Every engine is slightly different. When I fitted the Agostini mufflers to my Racer, the first map Todd sent me for that configuration had some minor issues. We worked together to develop a better map, which resulted in superb starting and running performance, but a bit of a backfire issue (I called it "burp and blatt" if I recall, or something like that) developed. Before changing the map again, I did the SAS removal ... the backfire issue then went away.

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