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How to buy pistons?

Discussion in 'The Garage' started by Super_Swami, Jan 7, 2020.

  1. Super_Swami

    Super_Swami XS650 Member

    Hi guys, I need some advice regarding pistons and cylinders.

    I'm currently rebuilding my engine. I need brand new pistons, and I'm going to get the cylinders honed and/or re-bored.

    My questions is, what order would I do these things? Do I buy pistons first then have the cylinders bored and honed to the size of the new pistons, or do I establish the ID of my cylinders, have them honed/bored, then buy the pistons according to what size the cylinders end up? Or is there another option?

    Apologies if its a dumb question, its my first rodeo.

  2. gettingold2574

    gettingold2574 XS650 Member

    You need the pistons and rings 1st. Then broed to their size.
  3. Super_Swami

    Super_Swami XS650 Member

    Thanks mate! Much appreciated!
  4. gettingold2574

    gettingold2574 XS650 Member

  5. azman857

    azman857 '80 XS 650SG Rider Top Contributor

    Not a dumb ?? at all. I'd get your cylinders and pistons measured first. Most are still stock bore and maybe you just need new rings. If scored bad then yeah, overbore and new pistons and rings. If you do need first oversize pistons Cruzin image in ebay is a good deal. They are 2nd over but they are about the best deal out there at about $102 (or about that) you get new pistons, pins and rings to your door. I'm running a set now. You will need to get your cylinders bored to match. I got mine .002 over piston diameter and all is good.
  6. motormike

    motormike XS650 Junkie XS650.com Supporter Top Contributor

    These XS units can usually get by with a hone-ring.... My machinist prefers a 2nd over bore… said it's easier for him to machine.
    gggGary likes this.
  7. Super_Swami

    Super_Swami XS650 Member

    Thanks mate, that helps alot. Ill check out those ebay pistons. Cheers
  8. Super_Swami

    Super_Swami XS650 Member

    Perfect! Cheers for the advice!
    gggGary likes this.

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