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  1. #1

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    260 pistons into 250

    Went racing on weekend and ended up with a sump full of water. After teardown found cylinder head cracks between number 2 and 3 cylinders.
    Thinking of installing 09 pistons during rebuild. Seen lots of discussion about keeping 07 cams, 4deg timing advance etc.
    I know many have now installed the 09 pistons. What is the best setup with 09 pistons in 07?
    Thanks.


  2. #2
    nicjak's Avatar
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    exactly as you have listed and read just do the pistons and timing you will be more than happy good luck im about to install my third head

    Quote Originally Posted by KiwiUltra250X View Post
    Went racing on weekend and ended up with a sump full of water. After teardown found cylinder head cracks between number 2 and 3 cylinders.
    Thinking of installing 09 pistons during rebuild. Seen lots of discussion about keeping 07 cams, 4deg timing advance etc.
    I know many have now installed the 09 pistons. What is the best setup with 09 pistons in 07?
    Thanks.

  3. #3
    Offshore Aussie's Avatar
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    Yeah, What Nicjak said. Don't bother with the cams as I have.....You all got me spooked about the head issue by the way.

  4. #4
    JET250's Avatar
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    Quote Originally Posted by Offshore Aussie View Post
    Yeah, What Nicjak said. Don't bother with the cams as I have.....You all got me spooked about the head issue by the way.
    love the sig, what mph did you get with B&SC wax.

  5. #5

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    Thanks guys.
    A couple of pictures of the cracks in the head. These cracks have gone all the way out to the fire ring seals. This looks like its becoming a common problem.

    Click image for larger version. 

Name:	Ultra head cracks 001.jpg 
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    Click image for larger version. 

Name:	Ultra head cracks 002.jpg 
Views:	56 
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ID:	191204

  6. #6
    nicjak's Avatar
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    dito

    Quote Originally Posted by KiwiUltra250X View Post
    Thanks guys.
    A couple of pictures of the cracks in the head. These cracks have gone all the way out to the fire ring seals. This looks like its becoming a common problem.

    Click image for larger version. 

Name:	Ultra head cracks 001.jpg 
Views:	58 
Size:	84.6 KB 
ID:	191203

    Click image for larger version. 

Name:	Ultra head cracks 002.jpg 
Views:	56 
Size:	106.1 KB 
ID:	191204

  7. #7
    2005 RXT Red08Ultra250's Avatar
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    Quote Originally Posted by Offshore Aussie View Post
    Yeah, What Nicjak said. Don't bother with the cams as I have.....You all got me spooked about the head issue by the way.

    What head issue??

  8. #8

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    Head now??? really??? I just cant win rxp eats clutches ..FZR stuffs for no reason hurting people ,,,,Im was selling my GPR now I think ill keep it and sell the other 3

  9. #9
    Offshore Aussie's Avatar
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    Paranoid now...You got's me mozzed. Can we have a few extra photos showing the alturnatively great new cooling route, for the slightly confused. Thanks. I'll try anything that works and keeps me out of the engine bay.

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