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  • Backfiring

    I just noticed this last week, when on deceleration from above 5000 I'm getting a backfire at 4500 (almost every time). This happened first on Tuesday and again today, today I was able to entertain my riding buddies by pointing my finger at them like a gun exactly when it would backfire. Both today and Tuesday were very humid days and both days eventually saw heavy rain, don't know if that was a factor. I'll get her out again on a totally dry day to see if it stops then.

    The bike's only engine mod is a K&N filter, the cans are stock... for about another week!
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  • #2
    My guess it is running a tad lean with the K&N and it will run leaner yet with cans on it. They come jetted lean on the bottom to pass emissions and rich on top to keep the motor from grenading on 87 octane gas.

    It would not hurt though, to lift your tank and take a good look at your throttle bodies with a strong flashlight to make sure they are fully seated.

    If you are really ambitious, take off the airbox (it probably needs oil cleaned out of the front TB area anyway) to make sure. It is not that hard. Set that TPS while you are mucking around in there.

    Is it really a backfire or more of a crackle in the exhaust on decel?
    "The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." - George Bernard Shaw

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    • #3
      My '97 TLS is doing the same thing. I think it's an exhaust gasket under the seat at the connector pipe. You may want to have a look. It could be the same thing.

      Good luck.

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      • #4
        Originally posted by makaza
        My '97 TLS is doing the same thing. I think it's an exhaust gasket under the seat at the connector pipe. You may want to have a look. It could be the same thing.

        Good luck.
        Mine does the same thing a new gasket is about $8 from ronayermotorsports
        Everyone dies but not everyone lives

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        • #5
          It's definately a backfire, usually a muted one but sometimes it's a cracker! Actually spooked a buddy of mine today when he was behind me. It's hard to tell but it seems to be outta the right can only.
          1

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          • #6
            itll be the gasket.
            mine was doin it for ages before i figured it out .

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            • #7
              So we're talking the gasket between the spigot and the header?
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              • #8
                Originally posted by coyo
                So we're talking the gasket between the spigot and the header?
                Yeah. I had to replace that gasket on my bike as well, it seems to be a real trouble-maker for a lot of people.
                <img src="http://people.clemson.edu/~sronnie/kpsig.jpg" height="100" width="500" alt="The Official Signature of the Chicken Strip Superstar"><br>
                Dig the 2 into 1 Exhaust...

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                • #9
                  Dodge: I'm looking at the fiche and only see a gasket between the cylinder and the pipe, not between the spigot (small 4-5 inch exhaust pipe that connects directly to the cylinder) and the header.

                  So you're saying it's the gasket right at the cylinder right? (the harder to get to point of the exhaust!) part #14181-31D00
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                  • #10
                    Well, you were right. Got my new cans (TLStreak's old Micron bolt ons) and did the gasket at the same time. No more backfire and a wonderful growl out the rear end, like it was meant to be. First overpass I went under I goosed it... and scared the shit outta my buddy riding right behind me. He came up beside me shaking his head and laughing but told me later that his heart stopped when I did it.

                    I love this bike.
                    1

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                    • #11
                      mine does it a little. nothing like my roomies busa when he put the blue flame exhaust on it without the pair valve mod. really shot blue flames about 2 feet long, both sides. now for you, i'd say its a little lean with the K&N thats all...

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                      • #12
                        Originally posted by coyo
                        Well, you were right. Got my new cans (TLStreak's old Micron bolt ons) and did the gasket at the same time. No more backfire and a wonderful growl out the rear end, like it was meant to be. First overpass I went under I goosed it... and scared the shit outta my buddy riding right behind me. He came up beside me shaking his head and laughing but told me later that his heart stopped when I did it.

                        I love this bike.
                        Could someone clarify which gasket is it exactly?
                        vas

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                        • #13
                          It's #6 on the fiche clicky clicky
                          Everyone dies but not everyone lives

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                          • #14
                            Originally posted by Stabber
                            It's #6 on the fiche clicky clicky
                            I got it. thanks.
                            vas

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                            • #15
                              Wouldn't backfires come from running rich? too much fuel in the cylinder and not all of it combusts on the compression stroke, ignites in the pipes creating the blue flames i could be wrong.
                              Why yes I am a jackass, thank you.

                              <------ Post whore in training

                              Http://530riders.com

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