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How to read piston size?

This is a discussion on How to read piston size? within the 4-Stroke Motorcycles - Honda forum, part of the 4-Stroke Motorcycle Forums category; I am currently rebuilding my son's 1986 XR 250. The Exhaust valves broke and 1 embedded itself in the piston. ...

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Old 11-12-2007, 10:00 AM
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Moto How to read piston size?

I am currently rebuilding my son's 1986 XR 250. The Exhaust valves broke and 1 embedded itself in the piston. I got it all apart, but I need to know how to read the piston size so I can order the correct parts. Does anyone know how to read it? Under the piston it reads

J
HF1

any help would be appreciated. I am going to have it bored out, but there is a piston I can get for cheap (brand new) if I knew the size for sure, it could save me $90

Thanks

Todd
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