OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Scott Bonnar Model 40 - Petrol

Head off today and it looks like 75cc

51.5 bore
34 stroke plus piston dome

r x r x Pi x S

By reading other post's it looks like the paint will have to be matched, just need to get the kids to schedule the strip down.