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Where to find the Model, Spec and Serial numbers on Honda Engines
Honda Engines use a standard model naming convention.

Honda engine model # breakdown

To find the model number(Engine series and engine size), look for a model number sticker on the engine.  All Honda engines model numbers start with the letter "G," such as "G100", "GX610", or "GXV160."  This is the base engine model. 

honda engine model location

Finding the Engine Type Code
The engine type code is stamped into the side of the engine, usually close to the serial number.  Engine type codes may be up to 4 characters.  If a code is less than 4 characters, you may see asterisks as placeholders (i.e. an engine stamped with QX** is a QX type engine.)

Honda engine type code location

Finding the Engine Serial Number
The engine serial number is stamped into the side of the engine.  All Honda engine serial numbers have a 4 or 5 letter prefix followed by a 7 digit number.

Honda engine serial # locations

Once you have located your engine identification numbers enter them in your owner's manual for future reference.  With these numbers our parts department can identify and order any part on the engine.