There ya go! At first, I suspected this might have been an upgrade of sorts. 
Larger pistons should translate to a more responsive front brake in theory but 
not if only on of them was replaced and may have made it worse because the 
system was not balanced. Any chance you have the old pads? I suspect the pads 
on the larger piston caliper would have been worn more as they may have been 
activating sooner.

Congrats in figuring it out 👍
--
Dwayne Wells
Sent from my iPhone 6S

On Feb 16, 2018, at 6:37 PM, "9533z...@gmail.com<mailto:9533z...@gmail.com>" 
<9533z...@gmail.com<mailto:9533z...@gmail.com>> wrote:

32mm on the left ...

On Friday, February 16, 2018 at 6:36:41 PM UTC-6, 
9533...@gmail.com<http://gmail.com> wrote:
Confirmed.  Guess I could have looked more closely at the calipers because the 
size is cast into the caliper.  30mm on the right and 3mm on the left.  Guess 
someone made the swap somewhere along the way.

On Thursday, February 15, 2018 at 6:01:48 PM UTC-6, 9533...@gmail.com wrote:
85 CB650SC and almost to the end of its winter brake system rebuild. Did both 
master cylinders, lines and right side caliper.  Was in the reassembly stage of 
the left caliper and after installing new seals i was about to push the new 
pistons into the caliper when they dropped in right past the seals.  The new 
pistons are 30mm. The ones that came out of the caliper are 32mm.  Immediately 
thought I ordered the wrong part but checked the fiche and part numbers, year, 
model of bike and everything is correct.  Does anyone know if the correct size 
pistons on this bike are 32 or 30 mm?  Its possible a previous owner (there 
have been at least a couple) may have installed a different caliper, but on 
only one side of the bike?  Am I missing something?  Thanks!

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