Home Forums Shifter Karts cr125 piston.

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    • #8811
      Valentin Yakimenko
      Participant

      Hi guys! I usually deal with my local honda dealer when I need parts. One of the guys at the track convince d me to give partzilla a try. Prices are much cheaper! But here is my problem. Partslist has 3 pistons listed. Can anyone tell me whats the difference in those pistons? Besides the part #. Thanx!

      http://www.partzilla.com/parts/search/Honda/Motorcycle/1999/CR125R+A/CRANKSHAFT+PISTON/parts.html

    • #8868
      Chris Reinhardt
      Participant

      It looks like they all cross to that 506 piston, the others must be NLA…

      Usually, you order a “A” piston for a “A” cylinder, but the difference very minimal, actually .0003″ smaller on the “B” according to the manual… But there’s a .0003″ spread for each, so a small “A” piston, might be the same as a large “B” piston…

      You can try ordering a 13110-KZ4-A40 and see what happens, you’ll probably get a 506…

      CR

      Chris Reinhardt

      CR2 Motorsports

      http://www.cr2motorsports.webs.com/

      XV Racing Products

      http://www.xvengineering.com/

      ­­

    • #8869
      Chris Reinhardt
      Participant

      Dupe

      Chris Reinhardt

      CR2 Motorsports

      http://www.cr2motorsports.webs.com/

      XV Racing Products

      http://www.xvengineering.com/

      ­­

    • #8870
      Valentin Yakimenko
      Participant

      Thanx!

    • #8890
      Troy V Smith
      Participant

      Hmmmm?  Well, now that this came up, I went to the shelf and pulled a A40 A piston and a 506 B piston and did a measurement.  Yes, Chris is right the difference is very little – the “A” piston diameter measured just above the ring grove was 53.761 – the “B” piston (which I though was supposed to be slightly larger), is actually measuring smaller at 53.745mm.  What gives – this screws up my plan! LOL

      What would be the benefit of using a smaller piston Chris? I could see going larger after enough wear in the cylinder, but smaller?  How much sidewall clearance is “required”?  Why wouldn’t one want to start with “B” piston and progress to an “A”?

      We may not be the fastest on the track...but we're having the most fun!
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    • #8894
      Valentin Yakimenko
      Participant

      +1^

    • #9415
      Valentin Yakimenko
      Participant

      All pistons superseded by 13110-KZ4-506 …

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