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  • Tank vent pumpless

    Hi guys just about to start pumpless mod and have a question. I have previously removed rollover valve and wondering if it would be enough for venting tank? It is open ended from tank vent to below the frame. Would I need to vent cap too? Thanks for the info. JC

  • #2
    I ran my '00 pumpless for years with only the rollover valve deleted. Finally vented the cap for shits & giggles...couldn't tell any difference (except for the strong smell of gasoline in the scooter shed).
    I love the smell of smoked pork in the morning !

    Comment


    • Horsehammerr
      Horsehammerr commented
      Editing a comment
      No problem with just the Rollover Valve removed , Cap still OEM .

  • #3
    the stock vent is fine if it is clear. over time some folks have experienced partial clogging probably due to a bit of rust...
    not all those who wander are lost......

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    • #4
      That should be sufficient. Just keep in mind, if your bike falls over, gas may come pouring out of that hose. If you happen to be sliding down the road at speed creating a lot of sparks when that happens, the end result could be that suddenly you are riding a large fireball. With that in mind, I chose to vent the gas cap.

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      • #5
        Thanks guys just removed the pump, set the float needle to lightly seated while upside down on bench to 5.25mm above bowl flange and reinstalled. All runs good but havent driven yet cause still snow from yesterdays storm. I have routed the 5/16” line below carb intake but wonder how have some routed above? Quite the bend down to carb inlet was scared to kink the line.

        Comment


        • Questcap
          Questcap commented
          Editing a comment
          All 3 of my R*s... I ran the fuel line OVER the intake with NO problem. Removing the pump was the only mod I did. I didn't vent the cap or remove the rollover valve, put a grizzle valve in, or alter the float height. I DID experience starvation at just under a qtr of a tank. Originally, I would cut down the Run intake tube of the petcock, but didn't cut the other 2... I just run on Reserve instead... No issues! Try it, before you do other stuff.

      • #6
        You can rout the line either above or below the intake manifold. I prefer above the manifold.

        I did try venting the gas cap, and didn't like it at all. After fueling the tank, fuel use to come out the vented cap when full and riding, and had gas smells when parked in the garage, so I went back to the OEM style.
        FB is right about fuel and sparks, it is something to keep in mind. Venting the fuel cap will leak out fuel if the bike is laid on it's side as well.
        The roll over valve removed is all you should need. If the roll over valve is working correctly, it could stay connected and work just fine, but they seem to screw up a lot. There might be some better roll over valves on the market for motorcycles, I'm not sure.

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        • #7
          My oem rollover valve needed to be soaked in deep creep in order to start working again. But I still removed it. The fuel line I am using is thick rubber non pressurized line and would kink or bind if I would route above the intake. It is a tight squeeze there with the tps and carb heater wires. I will not be venting the gas cap. Not a big fan of fumes in the garage and my wife walks thru there to go to her hair salon. Hopefully will get a chance this week to try out. Thanks Duke!

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          • #8
            I removed my roll over valve
            Better to have questions you can’t answer than answers you can’t question

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            • #9
              If you didn't change out the float jet the bowl won't fill quick enough under hard prolonged acceleration
              not all those who wander are lost......

              Comment


              • #10
                Took my bike out today and have a few questions to those who have done pumpless mod and adjust float height. All tuns good with no issues but only took out for a short ride 10mins. Now my bike does not need to have enricher pulled out to start. I am running 40 pilot and had done this in colder temps had coughing even with enricher pulled out upon first acceleration. I did not touch float height since I had purchased my bike 8 years ago. Wonder if now that float height has an impact on cold startup? JC

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                • #11
                  Float level too high

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                  • #12
                    Hi Dave I set it at 5.25mm above bowl surface but then read about you having it set at 3/8” or 9.5mm. Are you running pumpless? This was on the old site.

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                    • #13
                      I'm running a hsr 45 carb now. and was running a pump when I had the oem carb. you must have been reading from someone else . I never set my float using the bowl seam. (that I can remember)

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                      • #14
                        Doesn't the rollover valve just prevent fuel from coming out of the tank but still allows air to go into the tank? If so, how would its removal help when going pumpless?

                        Comment


                        • Duke
                          Duke commented
                          Editing a comment
                          The roll over valve is a double acting valve, it lets a very small volume of air into the tank or lets pressure out as temps raise. They are very sensitive and are prone to sticking easily.

                      • #15
                        Hi Dave see post from old archive site. Gonna try setting it where you have noted it being same as ODO method. JC

                        ​​​​​​https://wayback.archive-it.org/10073...limitstart,10/

                        Comment


                        • #16
                          Keep in mind that the pic in that old post that you referred to about 3/8 in was set at that measurement with me blowing thru a hose on the fuel inlet and that is the point that I could feel the valve close and no more air would pass by blowing thru the hose.I set it that way for 2 reasons. It gave me a correct float set and insured that nothing else was leaking on the float valve. (needle/seat or oring)Setting it that way was also with using a fuel pump. I never had carb puke or fuel smell in the garage also never had a fuel starvation issue in any riding conditions. With you being pumpless you might want to just lower the float to somewhere between 4 1/2 - 5mm and call it a day.

                          Comment


                          • #17
                            I have it now set at about 5 - 6 mm above bowl surface and that is with holding float and needle just sitting on seat. Raise up a little and needle opens. Are you referring to carb upside down or right side up and using drain tube with fuel?

                            Comment


                            • davej
                              davej commented
                              Editing a comment
                              not using the drain tube. The way I do it is a bit confusing to explain. It actually ends up being the same as ODO method.

                          • #18
                            I can do it with a tube on fuel inlet too and blow thru to see where it seats

                            Comment


                            • davej
                              davej commented
                              Editing a comment
                              When I set mine the way I described it was holding the carb upside down and blowing thru the fuel inlet. The measurement in the pic is where the float valve closes.

                          • #19
                            Ok Dave thank you for this greatly appreciate it. Will give it another try by blowing thru it to seal and go from there. JC

                            Comment


                            • #20
                              Took my carb off and checked level. I adjusted it by doing the same as noted above by blowing thru a tube. I ended up adjusting at 9 to 10mm above bowl surface or 3/8” and that was lightly blowing to when float needle seated and no blow by. It now starts same as before with enricher pulled out fully. Gonna test ride when weather warms up and report back.

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