Did you restore it ,or it was in this condition from the previous owner?
As i can see from your pics ,you use pre 1990 cylinder maybe 89 year freshly replated. It looks like new
Are you using RS or CR crank ? With 14mm or 15mm pin ?
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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes
/ Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton