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  • inj and exhaust

    Iv read for hours but im not grasping this. Do all fuel inj 1700 bikes back fire with cobra pipes? They were on it when i bought it. And cobra says its an inj issue. Back fire as in a pop when i get off gas quickly. If its cobra causing it is there a better option? Can the inj be set differently? thanks i just couldnt find right answer.

  • #2
    It’s normal to get popping or backfiring from any aftermarket exhaust especially if you do not have baffles. You can add a fuel programmer to solve the issue or just live with it

    i run cobra sweeps with no baffles, sounds meaner than the devil himself. I get popping on Deceleration but I just live with it

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    • #3
      If you still have the AIS installed or if you have an after market fuel processor installed, either can be your problem. Remove both. Forget about installing an after market fuel processor. I guarantee you it will make the bike run like crap. Scroll down in this thread to the exhaust section. Read all three articles, but you will rely on the third one for the 1700 engine.

      https://web.archive.org/web/20180223...ap/Itemid,179/
      “The West is the Best" - Jim Morrison

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      • #4
        what Cobra exhaust do you have? If you have Cobra mufflers on the stock header pipes that is about the worst exhaust you can have when it comes to decel popping. also do you have a aftermarket fuel controller on the bike if so that can be adding to the issue along with the AIS if still on the bike. in general Cobra exhaust systems are not the best. They sound OK and some look OK but a lot of the same issues with popping have been reported by members.

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        • #5
          if the ais is still on the bike any aftermarket exhaust is going to pop and crack like hell.
          my Wallet is Getting dangerously close to spontaneous combustion

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          • #6
            With the AIS on the bike it puts fresh air into the exhaust has it leaves the engine which then ignited it causing the popping. When you have the factory exhaust on the bike you really can't hear it. When you change out the exhaust you will for sure hear it! Get rid of the AIS if all possible! Run after market pipes with some sort of baffle and that should cure your problem. When I bought my bike it had Cobra pipes, but it was to loud. I bought Cobra quite bafflers and it runs great and still sound good without making you deaf and no popping on decel!

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            • D-Fresh
              D-Fresh commented
              Editing a comment
              Same here, ditched the AIS and installed the Quiet Core baffles and no more BF and better sound.

          • #7
            My used ‘09 came with Hard Krome Big Straights, but still had the air injection system installed. Normal driving produced mild popping, but during high RPM deceleration, it was obscene.

            With the AIS deleted and Hard Kore Quiet baffles added it is now acceptable.

            Mostly, it just burbles. If that’s an appropriate verb.



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            • Doc_V
              Doc_V commented
              Editing a comment
              Decel burble is good!

            • MikeyC
              MikeyC commented
              Editing a comment
              Yeah, I like the burble.

          • #8
            When i bought my bike it had Cobra Speedster Longs (still does) on it with the stock baffles, it backfired on decel to beat the band. Everyone on the forum told me to ditch the Air Injection System (AIS) and the BF would stop. I ditched the AIS and installed the Cobra Quiet Core baffles at the same time so not sure if the different baffles contributed any to the 99.9% reduction in BF or not but as Ron said it mostly burbles now on decel and i like the sound of the QC baffles also, the stock ones were a little obnoxious for me. My bike is a FI model with no aftermarket fuel commander. Ditch the AIS.
            2012 Road Star Silverado S

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            • #9
              D-Fresh I have same pipes or looks the same as yours. Same color bike even. I am assuming it has no after market controller, i dont know yet. Is the procedure for removeal of AIS on a 2012 the same as the 2003 in the tech article?

              Comment


              • Bikerron
                Bikerron commented
                Editing a comment
                If it has a controller installed from the previous owner it will most likely have the O2 sensors, on the exhaust pipes, unplugged.
                That’s an easy tell.

                If they are still hooked up the stock setup is best, believe me, as we’ve been around the block too many time on the old forum about these things.

            • #10
              The ‘03 was a 1600.

              Use the bottom link, but the fuelies do not have a vacuum hose to the throttle body from the AIS. There is a two wire harness that goes to the AIS, instead. Just unplug it and stuff it up under the tank. Be sure to save the steel gaskets where the tube flanges bolt to the heads and use them on the block off plates in the kit.

              i found that if you temporarily remove the regulator and chrome cover, and a few things in the way, on the left side of the cylinders, it helps getting to the bolts on the air tubes.

              If you want to watch a video first to get an idea of what you are getting into he does a good job of walking you through it.

              https://youtu.be/Bn0W_vXP01s

              https://rover.ebay.com/rover/0/0/0?m...2F231682838041

              https://web.archive.org/web/20180223...t/view/49/105/



              Comment


              • #11
                I think you can get the (dobek tfi or the ejk) version controller. The tfi version is really good because it has 4 little screws you turn to add fuel at any point in the rpm. Almost like tuning a carburetor but easier because you don't to pull it apart when changing settings. The ejk versions are the same just completely electronic so more things to go wrong lol. But all around good units, I would recommend , gets rid of any lean spots

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                • #12
                  ok thanks, doesnt look like a hard job at all. You guys are great! Well and gals if there are any.

                  Comment


                  • #13
                    Originally posted by Texas Jim View Post
                    D-Fresh I have same pipes or looks the same as yours. Same color bike even. I am assuming it has no after market controller, i dont know yet. Is the procedure for removeal of AIS on a 2012 the same as the 2003 in the tech article?
                    Jim,

                    No, carbed bikes and FI bikes have a little bit of different procedure. Attached is the kit from Barons (you can get it other places too) for the AIS delete. I circled in red the parts you will use. Also attached is a pic of everything you will take off, circled in red is where the block off plates go. I watched a couple of youtube videos and read the enclosed directions (which aren't very helpful). If you are mechanically inclined it's not that difficult once you get into it and see what connects where. Also if you haven't done so yet, download a copy of the factory service manual and look at the exploded views of all the related components, that will help a lot.

                    Cheers
                    2012 Road Star Silverado S

                    Comment


                    • #14
                      Originally posted by D-Fresh View Post

                      No, carbed bikes and FI bikes have a little bit of different procedure.

                      Cheers
                      That's not quite right D Fresh. The '00- '03 is a different procedure.
                      The kit you show in the pic works for '04 & up R*'s and Warriors. That's includes injected Roadies.

                      Comment


                      • #15
                        Click image for larger version  Name:	E4D725E2-DD17-4821-95E0-3C6FA88BE7AA.jpeg Views:	1 Size:	70.1 KB ID:	46661

                        The carbed 1700’s has a vacuum hose from the intake manifold to the AIS that needs to be plugged and that has confused some FI owners to some extent as there is no vacuum hose to the AIS, yet they managed to plug a vital hose from the throttle body to a sensor that shouldn’t have been.

                        we had one member following the instructions where it said, “Remove the regulator...”. So he did, and threw it in the trash along with the AIS.
                        lol



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