​How to Find Your Serial Numbers on a Honda Engine

Serial numbers are typically printed on or attached to the main body of the machine. They are not usually found on peripheral parts, as these can be damaged or removed. For Honda engines, the serial number is generally located on the crankcase. Use the guide below to find the serial number for specific Honda engine models.

Honda Serial Number Format

A Honda serial number consists of a 4-5 letter prefix followed by 7 digits, providing the complete identity of the engine.

Honda manufactures a variety of engine series, each with different serial number locations. The guide below details where to find the serial number for each model.

Honda GX Range

GX100 - Found on the left-hand side of the recoil assembly, beneath the air filter casing.

GX120 / GX160 / GX200 / GX240 / GX270 / GX340 / GX390 - Located on the left side of the machine (when facing the shaft), underneath the fuel tank.

GX360 - Positioned towards the back of the machine on the right side of the oil filter.

GX610 / GX620 / GX670 - On the right side of the recoil assembly/fan housing, between the spark plug and oil drain bolt.

GX630 / GX660 / GX690 - Located towards the bottom of the machine on the left side when facing the shaft.

GX 22/31 - Found between the air filter casing and the fuel tank.

Honda GXV Range

GXV160 - Underneath the recoil assembly on the left side of the oil filler.

GXV270 / GXV340 / GXV390 - Underneath the recoil assembly on the left side of the oil filler.

GXV610 / GXV620 / GXV670 - On the right side, viewed from above with the cylinders furthest away from you.

GXV 50 - On the right side of the air filter, under the fuel tank.

Honda GP Range

GP160 / GP200 - On the left side of the machine, when facing the shaft, below the fuel tank.

Honda GCV Range

GCV135 / GCV160 - Underneath the recoil assembly on the opposite side of the fuel tank cap.

GCV520 / GCV530 - Between the two cylinders (with "OHV" casings) and underneath the air filter housing.

GC135 / GC160 - On the left side of the machine when facing the shaft, on the same side as the oil filler.

Honda G Range

G100 / G150 / G200 - On the left side when looking at the shaft, near the oil drain plug.

Honda D Range

GD 321/411 - Underneath the muffler.

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