When the manufacturers first went to liquid cooling they retained fins as if they thought the engine wouldn't look right otherwise. Then as plastic enclosed the engines they didn't bother with fins presumably because we couldn't see them anyway.
Latterly though sprotbike engines have been dropped into naked bikes and all that metal is on view. Although it wasn't designed to look good, it manages to look just fine thanks.
There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop
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