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  1. #1
    gtxscrider's Avatar
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    Group K ultra 150 Servises?

    Ive been thinking about sending my heads to group k to have them do their head mod and cooling upgrade. How does it compare to the R&d heads in terms of performance gains and reliability? I will aslo send in my pump for a shim and bearing and seal change has anyone had any expreince with group k"s servises?
    Last edited by gtxscrider; 06-30-2008 at 11:24 AM.


  2. #2
    inchadeboca's Avatar
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    Thumbs up get the group k ones

    harry is second to none when i comes to modifications on 2 stroke motors. u will get similar if not better results, i would call him up, or email him....... the man is very knowledgeable, not mention that u will save money, because the RD heads are pricey-er

  3. #3
    inspecto's Avatar
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    i had Harry do an 1100 sleeper for my zxi years ago and it was very fast and reliable and worth the effort it took to ship him the motor.

    back in the day

  4. #4
    thesepaperwings's Avatar
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    He does great work but if you already have the R&D heads then you will not see much if any power gains.

  5. #5
    gtxscrider's Avatar
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    I have the stock heads right now. I realy want to make this ski as reliable as possible but also increase its performance. I knoe it wont be easy but i think this engine can deliver the level of performance and reliability im after.

    ill be happy with a constant 67-68mph

  6. #6
    btldigger's Avatar
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    You might also want to check out a level 1 kit from skiworx for comparison. That would hit or exceed your speed goals with no sacrifice in reliability. Group k does good work also not knocking them, had a 00 with their cut heads and it ran great. Gps'd it at 68.5

  7. #7
    Do work son ultra150nc's Avatar
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    i have had both on my ultra 150 group k stage one and ski worx. bottom line skiworx put a bigger smile on my face

  8. #8
    gtxscrider's Avatar
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    Quote Originally Posted by ultra150nc View Post
    i have had both on my ultra 150 group k stage one and ski worx. bottom line skiworx put a bigger smile on my face
    Wich would you say is more reliable ?

  9. #9
    thesepaperwings's Avatar
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    About the same. I have 100+ hours on my skiworx kit. High compression is fine because he has those carbs figured out more then anyone.

  10. #10
    Do work son ultra150nc's Avatar
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    Quote Originally Posted by gtxscrider View Post
    Wich would you say is more reliable ?
    Ski worx by farrrrr its just makes sence with the rejetting of carbs and compression i have 230 hrs on my ski

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