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  1. #1
    alex29573's Avatar
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    84mm R&D nozzle - 5 degree - will fit SHO/FZR/FZS/GPR OR GPRXP

    all holes filled and cut for rideplate angle

    70.00 SHIPPED


  2. #2
    Every adventure comes to an end........ Not Today! wreckingball's Avatar
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    Quote Originally Posted by alex29573 View Post
    all holes filled and cut for rideplate angle

    70.00 SHIPPED
    Stock is 85mm, right? So this would help top end?

  3. #3
    philip_gpr's Avatar
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    On a GPR it would probably hurt the top end. it is really tough to find a nozzle for a 2 stroke GPR better than the 85 mm GP1300R nozzle.

    These R&D nozzles are really targeted at the SC 4 stroke skis. This is where this larger nozzle might help top end if some motor mods have been done. Though larger nozzle diameters make it easier for the pump to cavitate so everything is a trade off (and with larger nozzles it makes impeller and pump selection all that more important)

  4. #4
    Every adventure comes to an end........ Not Today! wreckingball's Avatar
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    So the 84mm is larger? I'm running a 14/21 prop and I've yet to test my ski with new VF3 reeds and a 3deg key, but I was at 68xx rpm's before and looking to get them up to 7200rpms. If the changed I've made don't get the RPM'S up, I'm going to have to send prop back to Impros. But if this nozzle is slightly less pressure, it might actually help with this prop?

  5. #5
    Mike's GPR's Avatar
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    Nope, the 84mm nozzle is smaller. You will lose rpms the smaller the nozzle. Personally I think with spinning 68xx before and even with the 3 deg key and VFIII's you will still be a tad shy on rpms with the 14/21. Just those 2 adds you maybe add 150-200 rpms tops?

  6. #6
    Every adventure comes to an end........ Not Today! wreckingball's Avatar
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    Quote Originally Posted by Mike's GPR View Post
    Nope, the 84mm nozzle is smaller. You will lose rpms the smaller the nozzle. Personally I think with spinning 68xx before and even with the 3 deg key and VFIII's you will still be a tad shy on rpms with the 14/21. Just those 2 adds you maybe add 150-200 rpms tops?
    Yeah, that's what I thought... I started to get a little confused with the other post about cavitation in the pump. I was also running my fuel controller on the very rich side before. Now that I've installed an EGT probe into my exhaust manifold I'll be able to tune better without the fear of running lean and burning up my motor.

    I guess that's why we get to call it testing!

  7. #7
    philip_gpr's Avatar
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    on a 2 stroke gpr if you are currently using a 85 mm GP1300R nozzle, to get the rpms up you could use a GP1200r 87 mm nozzle - the 2 stroke skis don't have the same cavitation issues the larger heavier more HP 4 stroke skis have

    this 84 mm nozzle would be a good noozle for a FZR or SHO with some motor mods - the OEM nozzle on these skis is 82.5 mm so in this case 84 mm is larger

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