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  1. #1
    JKR1300's Avatar
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    ProX Pistons for 1300

    Is there a problem mixing the 'old' with the 'new' prox pistons?
    The old numbers are 7190, the new numbers are 01.2520. The
    pistons are made slightly different. The new ones also have some type of coating on the head, whereas the old style is not coated. My biggest concern is weight difference
    of approximately 12 grams (almost 3%)
    I'm rebuilding and ordered new piston from Carl who send me the new style.
    One jug went to Millenium, and they ordered a piston direct from prox, and it
    is the old style.


  2. #2
    PolarisNut's Avatar
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    If the pistons are off by 12 grams, I'd buy all new ones...sell your "old" style on here in the classifieds.

  3. #3
    JKR1300's Avatar
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    Quote Originally Posted by PolarisNut View Post
    If the pistons are off by 12 grams, I'd buy all new ones...sell your "old" style on here in the classifieds.
    Carl said the same thing - use all the same. Millenium took the 'old style' piston back.
    New one is on the way

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