Cr cylinder

Does anyone know what the HPP on the side of my 98 cr125 cylinder means and why my friends 2003 cr125 does not have it. I read that it was some kind of valve but I am still confused?

Honda Power Producer.



Its the power valve. your buddies 03 has power valves also,Just a diffrent system. almost all liquid cooled 2 strokes have them.

It stands for Honda Power Port..... BC bud smoker

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