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Pump Pressure Relief Mod

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  • TTT
    2011 ULTRA 300X SOLD


    • ttt

      made a sticky
      2000 Stock GPRXP ~ 83.6 / 7900 rpm
      2006 Stock RXP ~ 67.7 mph
      2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)

      Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !

      Buy your Performance Parts at @ www.4tecperformance.com


      • tie-in the pressure relief to the hole shot kit

        Having read the threads on how a jetworks hole shot kit work.. can't you tie-in the pressure relief to feed the waterbox? or is the difference in pressure too great?
        Current water toy: rocking an old school seadoo sp, oh hell yeah.
        Project: "Mighty Mouse" project, goal: getting a GPR hull to 70 mph for $1500 or less with an 800r engine??


        • jetworks opens after 3500rpm and stays open.

          pump pressure relief is intermittent, depends on pump over-stuffing and rider position
          My Never Ending Build : GP1300R
          Spare Build : GP1300R 2007
          Custom Gauge / Instrument Cluster
          Double Trailer



          • Someone help me understand. Is this an alternative to the Pump Tunnel Reinforcement mod? Is it an easier alternative?


            2006 gp1300r
            D Plate
            13/20 DF
            1200 R&D Aquavein Intake Grate
            PPK Kit
            Pump Tunnel Kit
            Opened front airbox inlet


            • Originally posted by K-Dubb View Post
              Someone help me understand. Is this an alternative to the Pump Tunnel Reinforcement mod? Is it an easier alternative?

              NO, these are separate mods. Of course with the pump pressure relieved you might be less likely to have a tunnel failure, but the tunnel reinforcement should be done anyway. The pump tunnel can blow out on a near stock ski where these reliefs aren't usually necessary until you are nearing the 80mph point.
              Been there... done that... currently got nothin...
              "Until we meet again - Thanks OSB"


              • Umm...is this enough??

                Click image for larger version

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                2009 FZS- R&D: Intake Grate, ET ?B Wheel, R3, 2nd Thermostat, Billet Couplers and Multi Port Adapter, Billet SC Shaft. Riva: FF Intake/Exhaust, Mani Upgrade, RRFPR and Power Cooler IC. Other: LC-1, PET 2500, Jim's VX plate and HKS BOV, 155mm 13/23 Skat Swirl Pro Pitch
                85 MPH, 8880 RPM

                Gone but not forgotten...
                1999 XL1200 Limited 62.1 MPH
                1993 SuperJet- 760 Big Bore, 59 MPH
                2000 GP1390R- Everything but triples, 77.7 MPH


                • good info


                  • Hi,
                    I know you did this mod years ago, I am just doing it now. I have been looking all over to figure out why or what reason you have the brass fitting on the left running into the ski. What is this for the cooling, if so why the change from the factory line? And also does blocking off the top spray help with top end speed?