New In Box (NIB)
Unused and in the original factory carton or box, complete with all accessories.
Unused and complete with all parts as originally sold by the factory.
Like New (LN)
Run once or twice, slight marks on lugs, otherwise as new.
Run several times, slight marks on mounting lugs, slight discoloration of cylinder head or cylinder due to heat. Very slight scratches on engine. Good compression, light wear on bearing surfaces.
Very Good (VG)
As excellent but used for several hours. Still good compression, slightly enlarged mounting lug holes, one or two deep scratches or moderately discolored spots, small chips out of or slightly bent fins, bearing surfaces discernibly worn.
As very good, but compression and bearing surface wear sufficient to warrant this rating. This code considered the minimum condition of interior necessary for a "use type engine."
Compression sufficient to run engine, but with reduced power output. Bearing surfaces well worn, one or more missing cylinder or head fins, one or more open mounting lugs, heavy scratches or blemishes on exterior, repaired parts, unacceptable as a display engine, but possible capable of a G or VG rating if overhauled and or new parts added.
Worn out, poor compression, will not run in present condition. Worn, broken, and/or surfaces badly scarred. Not suitable for use or display as is. May be referred to as a "Parts" engine or "Bones" engine.