Early/Late 2B Piston Differences

Wes

SILVER Star
Joined
Jul 17, 2014
Messages
383
Location
Texas
 
I noticed that there are two different part numbers for the pistons of a 2B depending on the year manufactured. I had always assumed they would be the same. The part number for 02/79-07/80 is 13101-57011. The part number for 08/80-10/82 is 13101-57020.

I would also like to note that the cylinder sleeves, piston rings, crank and connecting rod bearings, pins, and bushings are the same for all years. In addition to the pistions, the crank and rods are different part numbers.

Are the pistons interchangeable? What is different between the two?
 
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