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  1. #1
    Hydrotherapy's Avatar
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    little advice please.

    built a new engine for my 13 r 05.. full spec crank by crank works,new 07 cylinders + 155 p.s.i head..all yet to be assembled so i was thinking of replacing the stock pistons (unused) with pro x.. had a read on them and would like your input telling me if any gains can be had over stock pistons and down sides to running them,
    if there are better options please let me know thanks in advance...paul


  2. #2

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    I have always herd to run Yamaha pistons

  3. #3
    Happily Self-Employed WFO's Avatar
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    Most all the builders like the Yamaha pistons.

    I would use them. Especially since they came with those cyls.

  4. #4
    Hydrotoys's Avatar
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    Yup. I was highly impressed with the 60T stock pistons.

  5. #5
    Hydrotherapy's Avatar
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    thanx above thats good enough for me ...will put piston funds another place.. .. can the stockers be weighed and matched at home

  6. #6
    Flying Scotsman's Avatar
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    Salty I would assume there like GP pistons.
    OEM and Prox pistons are made by ART theres no difference.
    Wiseco pistons are different.
    You should be able to weigh and ballance them no problem.
    SCOTT..........

  7. #7
    Hydrotherapy's Avatar
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    Quote Originally Posted by Flying Scotsman View Post
    Salty I would assume there like GP pistons.
    OEM and Prox pistons are made by ART theres no difference.
    Wiseco pistons are different.
    You should be able to weigh and ballance them no problem.
    SCOTT..........
    scott... never balanced and matched pistons, thinking pukka scales and remove with tip of drill under crown in the middle right under wrist pin...or leave pin and bearing in to aid better weighing and equal ammounts off either side of pin ????

  8. #8
    Duke's Avatar
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    Salty, the pistons are made by the same people but the OEM yamahas are forged and coated which are not available from Pro-x. The Pro-x are cast and uncoated. I would go with the yami.

  9. #9
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by Duke View Post
    Salty, the pistons are made by the same people but the OEM yamahas are forged and coated which are not available from Pro-x. The Pro-x are cast and uncoated. I would go with the yami.
    perfectly said Duke, Yes Paul stick with the oem pistons.

  10. #10
    Mongoose's Avatar
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    hey salty,
    What happened to the 05 cyls/crank??
    If buying new cyls, I thought you might have gone the power valve route, and fittted some gas valves!
    I do know somebody that mifgt need some trashed cyls.
    Drop me a line.

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