Discussion in 'Performance Mods' started by canalcat, Jan 4, 2016.

  1. canalcat

    canalcat Member

    Got my jug off (for new gaskets) How do I get the black buildup off of my piston head and head of cylinder? The for help

  2. jaguar

    jaguar Well-Known Member

    scrape it off with a knife, then polish it with sandpaper
  3. canalcat

    canalcat Member

    The Jag hope I get it back together!! I took Notes
  4. jaguar

    jaguar Well-Known Member

    unless it is real thick it is best to leave it in place.
    it serves as a slight thermal barrier which prevents as much heat loss to the piston and head. people pay good money to have their piston and head ceramic coated.
    (I guess I should clarify by saying that heat loss equates to power loss)
  5. butre

    butre Well-Known Member

    I leave it alone unless I can determine that its causing hot spots
  6. HeadSmess

    HeadSmess Well-Known Member

    i run it lean enough that i dont get any deposits other than a slight tan/grey film...

    use a copper scraper is the standard practise, so you dont scratch the alloy.

    bit of oven cleaner/caustic helps but note that it does attack alloy. just brush it on, leave it a few minutes and quickly wash it off again.
  7. butre

    butre Well-Known Member

    I don't bother jetting until after I break it in, and sometimes I'll leave it alone for a few more days after that.
  8. 45u

    45u Active Member

    I bead blast mine then polish.