Piston Size

YZ125Ken
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8/12/2012
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Homestead, PA, USA
YZ125Ken

Rebuilding a 1983 YZ125k. Factory bore size states 56mm. I located a cylinder that is measuring 56.2mm. Do I still need the stock sized piston or will this need bored up to the next size? 

 

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Factor E
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Factor E 9/16/2024 5:30pm
9/16/2024 5:30pm
Get a B piston and have cylinder hone to piston clearance spec
YZ125Ken
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Posts
141
Joined
8/12/2012
Location
Homestead, PA, USA
YZ125Ken 9/16/2024 5:44pm
9/16/2024 5:44pm

Sorry for my ignorance but is the b piston the next size up?

Factor E
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Factor E 9/16/2024 9:14pm
9/16/2024 9:14pm Edited Date/Time 9/16/2024 9:22pm
Yup B or II

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