LEVEL 10 HONDA DIO engine case.
This is casting mold not CNC. 
 
 
3 different sizes are available
1.Crankcase Size 77mm/cylinder neck 55mm: For short stroke kit
2. Crankcase Size 80mm/cylinder neck58.7mm: For +2.00mm to +4.40mm crankshaft, 54mm cylinder 
3. Crankcase Size 86mm/cylinder neck60.2mm: For +7.00mm crankshaft, 56mm cylinder 
 
Product Description
*Manufacture: LEVEL 10
*Fit Models:
(1)HONDA DIO AF18 AF25 ARNADA (F5A F5B)
(2)HONDA SUPER DIO AF27 AF28 DIO ZX (F5Q F5P)