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06 SV misfire issues

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  • 06 SV misfire issues

    2006 SV
    - cam swap
    - full Leo Vince system
    - cut up air box
    - BDK charging system
    - 2nd throttle shafts and butterflies removed

    My SV is having intermittent misfire issues. It will idle fine and rev fine most of them time however it seems that it's developed an issue where it won't rev past 5-6k under load.

    I've swapped plugs and cleaned the fuel pump strainer to no avail. I rode it yesterday and when it ran right, it ran awesome however once it starts cutting out, it just stays that way unless I let it sit for a while. Sometimes that works, sometimes it doesn't.

    I pulled the PCIII off of it and that didn't help any.

    Coils or injectors maybe? Sometimes it'll throw a C31 code but not sure how a gear indicator issue would cause problems.

    Thanks for any help you can provide.


  • #2
    Did you check battery voltage when it starts cutting out?


    • #3
      I did not. I pulled the injectors and they seemed clean however I'm sending them off to Melka to get cleaned.

      Check it at idle or at RPM it cuts out at?


      • #4
        Either. Maybe your bdk is not charging enough and you running down battery.


        • #5
          Once I get injectors back from being serviced I'll throw them in and check it.

          I'll also reach out to BDK and see if I can get voltages at certain RPM's.

          Anything to do to test coils other than resistance?


          • #6
            You can check wire connections to coils to make sure all is tight.


            • #7
              Ok, back from vacation and put the freshly cleaned injectors in as well as making sure the Shori battery was charged. Bike fired up ok but now when I rev it, it has a sharp "pop" out the exhaust with a small flame. I've checked coil connections, battery voltage, talked to Brock at BDK about what the stator should be putting out and all is within spec.

              What's left? Coils going bad?

              Now, I only let the bike get up to about 140 degrees tonight and did not ride it since it was raining. Once I get the yard mowed tomorrow, I'll take it down the road and see how it does but I'm not sure what else it could be unless a valve or something like that is bad but I'd think that would cause it to run bad all the time.


              • #8
                Sounds like the map might be rich? Does it pop/backfire throughout the rev range?


                • #9
                  So I've determined that the rear cylinder is the one having issues. It's dripping fuel from the header/midpipe connection. I swapped the plug and unhooked the PC3 and nothing changed.

                  I unplugged the spark plug boot and put the old plug in it and checked spark...very strong spark and the bike revved smooth on one cylinder with the spark for cylinder 2 getting brighter as the RPM increased.

                  Only thing I can think of now is that I've got cam timing off on the rear cylinder some how.

                  I'll look up pictures of how the timing marks should be set and double check that.

                  Any other suggestions?


                  • #10

                    Hose from tb's to iap sensor not connected.


                    • #11
                      Hose is hooked up, rear cylinder is completely dead. It's got spark, compression and obviously fuel so what's the issue?

                      My concern now is that I drained the oil and it's got fuel contamination in it. Good thing is, it's not been that way for long and it's Mobil 1 so I'm not super worried about the bearings. I guess worst case, I have to put rings in it.

                      I'm trying to see if my friends leakdown tester has the 10mm adapter


                      • #12
                        Cam timing out 360 maybe? I only checked the rear to make sure it was right but maybe I need to pull the front cover and make sure all is in time total.


                        • #13
                          Need to check both and make sure they are one crank revolution apart.


                          • #14
                            Since I don't have the stock flywheel anymore with timing marks, is the easiest way to do this just line up the front intake cam and mark the starter gear turn it one revolution then check the rear?


                            • #15
                              Why don't you mark flywheel?
                              How did you put cams in without marks?