From:Rob Root
Subject:1955 ST165 Piston difference Date:Mon Dec 26 02:00:56 2016

I just got a replacement piston for my 1955 Harley ST165. The old piston is faintly marked "STD", and there is an arrow with "FRONT" stamped beside it on the crown.

The old piston (which I believe to be the original), has a cutout on the lower rear skirt, looks like to clear the carburetor port sooner. The old piston also has one of the corners outboard of the cutout broken off. Looks to me like this was perhaps a trouble spot?

Anyway, my new replacement piston does not have this cutout. Front and rear skirts are identical length. Does it matter?

I can post pictures, if my description doesn't make it clear enough...

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