Mercury Marine pilot jet #42 for 5 hp 4-stroke is an original OEM carburetor jet for compatible Mercury and Mariner outboard motors. The part is installed in the carburetor and is identified by jet size #42.
The pilot jet is documented for Mercury and Mariner 5 HP 4-Stroke engines with serial number 0R017219 and lower. Compatibility applies to the specific 5 hp variant and should not be inferred solely from spare parts catalogs, which also include other engine sizes.
The Mercury Marine OEM part number is 803524. This variant must not be confused with pilot jets of other jet sizes. Therefore, check the engine model, serial number, and existing part number before ordering.
Key featuresOriginal Mercury Marine OEM spare part
Part number: 803524
Part type: Carburetor pilot jet
Jet size: #42
For Mercury and Mariner 5 HP 4-Stroke
For serial number 0R017219 and lower
Check model, serial number, and part number before purchase