not sure,pulled the jug from 2 026 pro's today(has decomp,intel carb,and adj oiler)but the bores only measured 44mm....................i thought these were 44.7mm............................
All 026's I have pulled down have been 44mm. You are lucky as I believe the 44.7 mm jugs have milder porting. I have some of each and aside from a Masterminded 44mm they all feel much alike.
I love this series of saw and aside from the 50cc partners are my favourite small saw.