Home Forums Shifter Karts cr125 piston.

This topic contains 6 replies, has 3 voices, and was last updated by  Valentin Yakimenko 7 months, 1 week ago.

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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

    #8869

    Chris Reinhardt
    Participant

    Dupe

    #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”?

    #8894

    Valentin Yakimenko
    Participant

    +1^

    #9415

    Valentin Yakimenko
    Participant

    All pistons superseded by 13110-KZ4-506 …

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