it does help a bit.Honda told me that they had 2 pistons? Same part numbers except a D on one number ?I will be back there next week and get some part numbers from him and let the forum know what I found out.
They make a “A” piston and a “B”, they discontinued the “A” piston which was a fraction larger to fit with the “A” cylinder. You could swap an “A” and “B”, the difference was so slight….