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Roadstar won’t start.

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  • #21
    I think you found your problem. Take the plugs off, dry them, flood the cylinders with brake cleaner and crank that sucker up with no plugs. It might be a good idea to take the injectors fuse off while doing this so it doesnt inject fuel while cranking it. Put some paper towels over the holes cause you are gonna spray the whole garage with brake cleaner if you dont. Crank until there is no more cleaner coming out. Put the spark plugs in and enjoy the ride. I might put new plugs while youre at it.

    Comment


    • Sshows
      Sshows commented
      Editing a comment
      ok, I can do this.
      I'm not sure I understand the principle though. Please educate me on this, what am I hoping to accomplish here?

  • #22
    You have fouled plugs and cylinders full of fuel, this method will dry the cylinders so when you put new plugs they wont get soaked in fuel. It will fire up good. Spray a little brake cleaner on the intake before you start it to sort of prime it.

    Comment


    • #23
      Spark plugs can become so gas fouled, they won’t spark. It seems like it’d be impossible, but.....
      I think I’d recommend new plugs. I’m not sure if the brake cleaner in the cylinders is needed, but....
      If both plugs are out, and you seal both plug holes on a cylinder with a rag and then crank the motor over, the compression will pretty well blow the residual gas out of the cylinder.

      Comment


      • Sshows
        Sshows commented
        Editing a comment
        Plugs are new.

    • #24
      If it didn't hit a lick on starting fluid, then it leads me to beleave you problem is in the ignition system. I doubt it's the coils, as both usually won't go bad together. Check the power going to the coils, and the ohm's on the crank trigger. If they are good, then it might be the ECM.

      Comment


      • Rodzim
        Rodzim commented
        Editing a comment
        He said he did have spark

      • Sshows
        Sshows commented
        Editing a comment
        I do have spark. Have not checked ohms. I parked this bike last Tuesday and Wednesday morning it would not start.
        Very frustrating.

    • #25
      After reading shores link:
      https://www.roadstarclinic.com/forum...ion-facts-tips
      im wondering if I have a vacuum issue. I rode the bike on Tuesday then rinsed it off and Wednesday morning it wouldn’t start. I did not do a hard wash and only hosed off some of the dust. i cannot imagine a little water caused all of this havoc. I have ridden in downpours without issue...
      Back to the service manual for more reading.

      Comment


      • #26
        Because you rode it recently and washing it was the only thing you did, I think it’s related to washing. Dry it off real well using a leaf blower, especially under the tank, behind side covers etc where there are electronics. Don’t think to hard, you’ll hurt the team!
        “The West is the Best" - Jim Morrison

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        • #27
          It’s been a week since I washed it but you might be correct. I’m almost ready to build a fire!

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          • #28
            Another thing to do is unplug, clean and replug all major electrical connectors. I’d even disconnect the battery and let it sit for a couple hours.
            “The West is the Best" - Jim Morrison

            Comment


            • Sshows
              Sshows commented
              Editing a comment
              good idea

          • #29
            Just a thought! If sparkplugs are not NGKs, can them and put some in.

            Comment


            • roadiemort
              roadiemort commented
              Editing a comment
              Why Yamaha recommends Denso plugs as well as NGK

          • #30
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            • Agpilot
              Agpilot commented
              Editing a comment
              I will not elaborate but have had some issues with Denso.

          • #31
            Todays progress report:
            Starting yesterday I cleaned and dried the (new) NGK DPR7EA-9 plugs with brake cleaner.
            I chickened out on filling the cylinders but left the plugs out overnight in the garage with a fan blowing on the bike .
            I hoped to dry out the cylinders and any water that could possibly be hiding anywhere on the bike from last weeks rinsing.
            This morning I re-checked all of the fuses and sprayed a little starter fluid into the cylinders before replacing the plugs.
            I tried the bike and it would crank but not fire.
            I shot a bit of starter fluid into the intake and felt for vacuum. I have vacuum; but still no go.
            I could smell starter fluid coming from the exhaust pipes.
            I checked all of the electrical connectors that I could reach- all seemed clean and dry.
            I removed the 18 month old battery and took it to Batteries plus to be tested just in case.
            The battery compartment was clean and dry.
            it showed 12.77 volts and 297 cold cranking amps with the needle pegged out on the good side.
            I went back home and pulled the plugs again and did a visual inspection for spark. Sparkes were produced.
            Plugs were also wet with gas from previous starting attempts, so I have to assume gas is being delivered.
            I still wonder if clogged injectors may be "dripping" gas and not spraying it?

            I managed to get the back right plug cross threaded and now I am waiting on a 12mm back tap thread repair tool to be delivered tomorrow so I can replace the last plug before I trailer it to the dealer.
            I'm all out of ideas and I think I may be out of my league.
            Thanks for all the comments!

            Comment


            • #32
              Well im new here but i am a mechanic, i dont care what engine it is. Bus truck airplane if that plug is wet its flooded and it will not start. I work on stihl and if its flooded i pull plugs and use carb cleaner and compressed air to clean them. I then blow air through engine which be hard on a bike but can spin it over with switch off and plugs out. Liquid gas wont start any thing. Be very careful with thread chaser because it you start chaser crossed threaded it could end badly.

              Comment


              • #33
                Thanks Texas Jim.
                I appreciate your comment and agree with everything you said.
                My cylinders were clear and spark plugs clean and dry before I tried the last start-up.
                I don't thing the bike won't start because its flooded; I think I'm flooding it because it won't start.
                I have a 125psi 2.5hp 25 gallon air compressor. How do you spin the motor with switch off and plugs out?
                This is something I would like to try.

                Comment


                • Bikerron
                  Bikerron commented
                  Editing a comment
                  By jumping the starter relay with a screwdriver.

              • #34
                A lot going on in this thread but I am going to have to go with Duke regarding the spark. I have never seen any engine that would not at least pop and wease a bit with starter fluid if it had a spark. You say you have spark so I must believe you..so the only thing left is if you are getting spark at the right time......
                not all those who wander are lost......

                Comment


                • #35
                  There could be something going on with the kill switch on the handle bar, or maybe on of the connectors is partially unplugged. I would start checking all of the electrical connectors, get a couple of cans of contact cleaner or brake cleaner, or wd40, which will help wick away moisture and dry out everything. Check your key switch connector and the switch itself. You need to rule everything out by process of elimination. Check the wiring and connectors going to the ignition coils. Also possibly the tps on the carb, which I believe helps control the ignition timing maybe keeping it from firing properly. It is probably something simple since it run one day the would not the next.
                  Where ever you go, there you are.

                  Comment


                  • #36
                    So did anything pop up when the diagnostics were run?
                    Scott B.

                    Comment


                    • Sshows
                      Sshows commented
                      Editing a comment
                      To be honest I have not performed that test. I keep re-reading the manual concerning the diagnostic mode and it just does not compute for me. To be clear; we are talking about the procedure listed on page 7-34 in the manual, correct? Once I get it into mode am I supposed to click through 70 options?
                      This part confuses me:
                      ‘’To decrease the selected diagnostic code number, press the “ ” side of the “SELECT” switch. Press the “ ” side of the “SELECT” switch for 1 second or longer to automatically decrease the diagnostic code numbers.
                      • To increase the selected diagnostic code number, press the “ ” side of the switch. Press the “ ” side of the switch for 1 second or longer to automatically increase the diagnostic code numbers.”

                    • texasscott1
                      texasscott1 commented
                      Editing a comment
                      I remember that procedure but not having the book in front of me I can't lead you through it. At least one of the other owners here has the manual and can explain it.

                    • Sshows
                      Sshows commented
                      Editing a comment
                      I’m planning on sitting on the bike tomorrow with the manual. It will either make sense or not. Nothing to lose.
                      Thanks!

                  • #37
                    Seams to me the ignition is having a weak signal or a intermittent problem. The crank trigger would be the area I would be checking. Just a thought.

                    Comment


                    • Sshows
                      Sshows commented
                      Editing a comment
                      I thought about this all night. You have to be on to something here. I am going to spend some time focusing on the spark, etc.today. There is no reason this thing would not at least have backfired with the starting fluid.

                  • #38
                    On a side note the Sportster fired right up today so I went for a 90 minute ride before mowing the lawn.

                    Comment


                    • #39
                      Progress so far:
                      I just finished going through the entire diagnostics mode and it was pretty cool once I got the hang of it.
                      ‘Front and back coils test ok as well as injectors. No fault shown on anything and fault history is clear, but two tests seemed a little confusing to me.
                      maybe someone here has experience with these?
                      From the manual
                      ”d:04 Intake air pressure
                      Displays the intake air pres- sure.
                      Set the engine stop switch to “ ”, and then push the start switch “ ”. (If the dis- play value changes, the performance is Ok.”
                      mine started at 98 but the value did not change when I pushed the start switch.
                      I did have the air filter off and I don’t know if it really matters.
                      also d:55 tested out ok but also shows 2.0
                      i can’t find any info explaining the 2.0
                      maybe i’m just blind...Any ideas?
                      i have the plugs out now and going to clean with brake cleaner as well as cylinders per Rodzim’s advice.

                      Has anyone ever turned the engine over by lifting the back end and spinning the tire while in gear?
                      Just curious.

                      Comment


                      • #40
                        Quite a few of us, have bike lifts/jacks, that lift the whole bike in the air. When its off the ground, that's easy to do.

                        Comment

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