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« Last post by K2-K6 on Today at 08:19:16 AM »
Could be wrong, but some details on that piston appear odd against what I recall as normal.
Looks like .... the top valve clearance "pocket" has been recut, with evidence of original visible near to edge, then another pocket located inwrads.
Is there some bits missing from ring land at about 2 o'clock ? Those little triangle marks, or just carbon and indented ?
The turning finish is quite "rudimentary" especially in the centre, and makes them look like a modified piston possibly.
The official Honda manual for F2 indicates to put the "offset "O" mark on piston faces to exhaust side (forward)" quoted directly, it gives a picture of the O location consistent with your piston too. But if you're really unsure, then assembly with representative gasket and use plasticine to check valve pocket clearance by rotation of crank would be definitive in assessing them.
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