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  1. #1

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    Question about getting Top End on my 01 GP1200R?

    I bolted on some Island Racing modded Carbs, went premix and put a 150 PSI head and a D-Plate on my GPR. I premixed my oil on the thicker side for its first time out w/o oil injection, and I thought I would gain top end but what I got was ungodly fast midrange, and 64 mph on my GPS--same as stock. Unfortunately my tiny tach died so I don't know how many rpm's I am turning.

    I am also using Riva sponsons and an R and D intake and stock ride plate which probably added drag but I stayed very well hooked up. Sponsons are in the middle position. I don't know how many mph this set-up subtracted from me.

    I am going to use either Penzoil or the rest of my yamalube until I go with only Amsoil next spring. What is the best premix ratio to use?

    I really can't see an impeller giving me 6 mph of top end (my goal on this was 70 mph, but stable). I bog badly out of the hole and I am hoping its the oil being too thick because I don't want to have to remove my carbs again, but once the ski catches, its the best midrange I have ever felt on a Stage II GPR.

    I haven't put the R and D CDI in it yet, as I am trying to figure things out one at a time. I am wondering if this will increase my top end at all.


  2. #2
    Moderator beerdart's Avatar
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    What is the condition of the impeller and impeller clearance??

  3. #3
    WATER WOODY's Avatar
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    You gained from the carb mod then lost it by replacing cat con with the d plate. Your pump sealed? What prop? R&D 1200 grate i assume,its slower than the OEM grate(dont run stock grate)You must get another tach and let us know your rpm's.VERY IMPORTANT.

    What was your weather conditions? (RAD)
    How much fuel?
    Last edited by WATER WOODY; 10-25-2007 at 09:55 PM.

  4. #4
    mrbtd's Avatar
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    Figure 100 rpms up top is almost 1mph. Without a modded ride plate 70 will be tough.

  5. #5
    philip_gpr's Avatar
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    "I bog badly out of the hole and I am hoping its the oil being too thick"

    oil being thick was probably not the cause - I once ran 16:1 (I can't mix oil properly) and ski ran fine

    typically you want to be 32:1 or 40:1

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