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pop up

  1. WoodsliverDan

    Husqvarna 550xp pop up

    So, after doing some research and not finding much on making a pop up piston for the 550xp, I have decided to make one to try and post my results. After measuring the squish, (with gasket) and finding it to be .030" I have decided to turn .030" off the base of the cylinder and .020" off the...