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  1. #1
    danieletrono's Avatar
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    Ultra250 1.05 Pulley:How prevent failure??

    Hi guys if i will put a 1,05 pulley how to prevent a failure? How to improve the cooling of engine?(i have read that skip has some ideas?).

    The problem is that the root spin faster and increase temperature causing a sc and engine damage/failure.
    Any solution?

    Thanks


  2. #2
    Hooah_Killer's Avatar
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    daniel i know there is a slight language barrier HOWEVER every question you have been asking are ALL listed here in gh AND skips site AND 250xtech site. Rather than just posting here asking these question, search for the topic you want, they are there. As you can tell you do not get many responses to your questions......we all search for them ourselves and find what we need.

  3. #3
    danieletrono's Avatar
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    Thanks but reading there is no one clear reply !!!

    So i have asked.

  4. #4
    GODOSIDIS's Avatar
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    Thats because there is not only one answer.
    I believe that 1.05 on pump gas is imposible while others claim to be running it safe for a while.

  5. #5
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by GODOSIDIS View Post
    Thats because there is not only one answer.
    I believe that 1.05 on pump gas is imposible while others claim to be running it safe for a while.
    Why would it be impossible? I used the pulley on 93 oct and also tried the 1.1-1 on 93 oct. No problems at all.

  6. #6
    GODOSIDIS's Avatar
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    Blu u r the one i had in mind
    Our 1.05 dropped a valve and cracked a cylinder head.Air temp 35C+
    Also R&D (Glenn) told me on the phone DONT use the 1.05 with pump gas.

    I dont question your results i am just posting my experience.

  7. #7
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by GODOSIDIS View Post
    Blu u r the one i had in mind
    Our 1.05 dropped a valve and cracked a cylinder head.Air temp 35C+
    Also R&D (Glenn) told me on the phone DONT use the 1.05 with pump gas.

    I dont question your results i am just posting my experience.
    You have pictures of your cracked cylinder head? Did it look anything like this?
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  8. #8
    GODOSIDIS's Avatar
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    Quote Originally Posted by BluUltra250x View Post
    You have pictures of your cracked cylinder head? Did it look anything like this?
    Yes very similar.
    Pics were saved in an old computer back in 2008, cant find them

    We didnt replace the cylinder head ,luckily we were able to fix it.
    If i recall well there was also a crack in the valve guide.

  9. #9

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    Scott, go Bob the Bulilder on that S&#T!!! "Can we fix it? YES WE CAN!"

    You will get it! Show that motor who the boss is.

  10. #10
    Hooah_Killer's Avatar
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    ok so the cracks in the head are caused from dropped valves?? other?

    so is it or is it NOT ok to do the 1.05 with hd pump, fpr, etc etc on pump gas???? since this would be my next mod..i do not want those results.......

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