1995 CR125 Piston Question

Headshake
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50
Joined
2/15/2013
Location
Hartford, CT, USA
Headshake
I am beginning the restoration of a 1995 CR125 I picked up a couple years ago. I have a question regarding the oem piston. The bike has a “B” cylinder and I have acquired all the oem top end parts (gaskets, wrist pin, ring, clip etc.) but can’t locate an oem piston for the 1995. It seems like the 1997 “B” piston is available for purchase but is a different part number than the ‘95. There is no reference to part numbers in the Honda service manual so I’m a bit lost. Anyone know if the ‘97 piston is interchangeable with the ‘95?

I appreciate any help with this. I have been searching the forums and can’t find an answer.

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sandman768
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Saratoga Springs, NY, USA
sandman768 12/11/2020 7:25pm
12/11/2020 7:25pm
I kind of ran into this when I rebuilt the top end of my 93cr125 with B cylinder. I wanted an oem piston but was NLA. If you go to ProX web site, they state 92-2003 piston are interchangeable. ProX offers 4 different sizes A-D incrementally larger. Now, Honda lettering system is opposite of that, your B cylinder is the actually slightly smaller bore than the A. ProX would be the closest piston to OEM as they are cast & made by ART, the same as most Japanese OEM”s. I tried their smallest OD piston, an A piston, it was too tight in the bore of my low hr 93 B cylinder. So I just re- ringed my piston and eventually found a B Oem Honda piston on eBay. ProX gives the piston measurements on their web site, so you can measure your cylinder & choose best fitting piston or if you think your cylinder is still fresh/ no wear, look for an OEM piston on eBay by searching the part #. Confused yet😂
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Headshake
Profile picture for user Headshake
Posts
50
Joined
2/15/2013
Location
Hartford, CT, USA
Headshake 12/12/2020 6:23pm
12/12/2020 6:23pm
Haha thanks for the info Sandman. I’m gonna measure the cylinder within the next couple of days and then start hunting for the right piston. Really excited about getting going on this project and sharing some of the work with my son. Thanks again.

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