baz
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Sorry I didn't explain it very wellNo, the one that the top comes off have slots under (inside) the oil control ring that goes half way around the piston. These shown do not. That said only the combat engines suffered failure with the slotted pistons all Altas and pre combat 750 Commandos came with slotted pistons with no issue.
I meant the ones in the video only" look "like the type that the heads fall off but they are not
And as I said the slot is behind the oil control ring