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  1. #1
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    group K Big Block results

    I went out to day with My Dad... He runs a 2005 RXP He kicked my a$$ last year: WELL...
    Temp 58*
    water temp 55* (RXP SAID SO)
    400ft above sea leavel
    5-8 mph wind.. small chops.. 1-5 inches

    He ran 70.2
    I ran 73.1
    72.6
    72.5
    all the rest of the day Rpm 7220 ---7210-

    I do not consider this killing rxp, but I did beat him! NO IF"S and or buts.

    The ski is a 2002 gpr 1200 cc stock
    I still need a good plate. I have a modded stock one. and jet works, carbon fiber reeds. pro-tec stuffers, aqua vane loader..

    much more to come, to day I smile, I perpare for tomarrow,,,


  2. #2
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    By the way: This Is EXACTLY WHAT HARRYS web page said I would run. the man knows his SH*T. Thank you Harry

  3. #3
    txgp1300r's Avatar
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    a kill is a kill...poor ol dad.....good job

  4. #4
    Add a plate and you're mid 70's+, then you can say you smoked him!

  5. #5
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    That's my next move.. I have a R&D hitting my door monday afternoon. I think I'l send it to jim. or Island.. I'm still thinking about that. I don't know If I have the extra $$$ for jim's..

  6. #6

    Join Date
    Aug 2005
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    Greenville, S.C.
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    86
    Excellent
    My GK-BB ran between 72-73 mph when I first got it back from Harry.
    GroupK delivers what they advertise. I have put on an Advent CDI and a Riva SB 14/21 prop since I first put on the kit. The ski runs between 74-75mph now. Be sure that you go with pre-mix, I made the mistake of keeping the oil injection and I fried my #3 piston. I had to get a new piston and rings from Harry, but the cylinder was redone by Millenium for about $200. That sure beats having another cylinder bored and ported.

    How is your holeshot compared to that RXP ??

  7. #7
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Having problems with hole shot. has a lag for a bout 2 seconds. I think all the premix got to the plugs. I was on 28:1 for break in. next tank I go to 32:1.. I was running 28:1 on the numbers posted.

  8. #8

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    Quote Originally Posted by great lakes gpr 1200
    Having problems with hole shot. has a lag for a bout 2 seconds. I think all the premix got to the plugs. I was on 28:1 for break in. next tank I go to 32:1.. I was running 28:1 on the numbers posted.
    Does it happen when you engine warms up? Mine doing the same thing and the plugs are fine! It feel like a lean condition, I'm leaning towards a bad temp probe or a case leak. The problem isn't near as bad (sometimes I can't even notice it,) when the thing is warmed up.

    That's way I'm leaning towards one of those two issues... Hope the dealer tech and figure it out!!! It's the wife's stock ski with only 9.+ hours on it.

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