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CB750 sohc F2

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archmill:
Got the pistons ready for fitting ( ring gaps checked, pistons cleaned ) and noticed I had not marked them front and back.
Do the pistons have a front and back ? or does it not matter.
Anybody know ?

Johnwebley:
Normally a small arrow on the crown

With the size

Looks like a small triangle

Sent from my SM-A546E using Tapatalk

Bryanj:
Yes it matters and should be marked if genuine

archmill:
[ Guests cannot view attachments ] no arrows guys but the pistons have an indented circle on them. Assume this is front ?

K2-K6:
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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