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  1. #1

    Join Date
    Jul 2006
    1600Lisbon, Portugal - Europe

    Starting from Zero testing XP/XPL Pump

    Have upgrated my XP/XPL 2001 from 951cc stock, to second hand 1050cc rotax racing kit last bore and new 92.04mm piston's.
    I'm confused wich impellor to go to the best top speed.
    Any help?

  2. #2
    m schmidt's Avatar
    Join Date
    Mar 2007
    East, Tn.
    In a stock pump I think a 15-20 concord works real good. I run a 15-21 concord in my setback pump.

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