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I'm pretty sure only the pros had 44.7 mm.
All 026 are 44mm. Pro or non-pro. The handle sticker will say 49cc displacement.That's not true, I've rebuilt several 026 pros with 44mm topends.
MS260 are 44mm or 44.7. The later ones are 44.7 and the handle says 50cc. Both pro and non-pro