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ecmn | top of piston looks lean. by each intake port there should be a half dime or bigger of washed clean piston. carbon to the edges means lean.
the ports have tiny bit of chamfer along the sides and top. you can see the roughness of the intake ports, that gets cleaned up. bottom of sleeve gets angled better and sharper, there are many little things to do on port clean up to gain power and performance without doing a lot of port work.
Edited by easymoney 5/11/2016 18:58
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Pic. of Can Am 2 stroke scorched pistons and head.
