engine work continues...

Today I checked and aligned the 90,5 mm AA pistons for equal weight.
After some fine tuning they are now all exactly 415 grams (there was only 1 gram between the 2 extremes anyway):

in order to reduce the weight of all moving parts, I will use lighter wrist pins:
left: light version - right: original wrist pin

here is the weight difference:

= another 13,6 grams per piston saved!