Sierra 18-5859-1 Marine Stator Kit 9 Amp for Mercury Mariner 80 HP and 85 HP 4-Cylinder Outboards, Replaces 398-5454A26

The Sierra 18-5859-1 is a 9 amp marine stator kit built to replace the charging stator on Mercury and Mariner 4-cylinder outboard motors. The stator is the stationary charging coil inside the outboard's flywheel housing that generates AC current as the flywheel spins past it, feeding the rectifier to keep the battery charged and the ignition system powered while the engine runs. This kit is designed to meet or exceed original equipment charging output and is built to hold up to the vibration, heat, and moisture exposure of the marine engine compartment.

The Sierra 18-5859-1 is fit specific to Mercury/Mariner 80 (80, 800) 4-cylinder outboards within serial number range 4831999 to 6432900, and 85 (850) 4-cylinder outboards within serial number range 4366802 to 4831998. Buyers should confirm engine model and serial number before ordering, since stator kits across the Mercury/Mariner outboard line are not interchangeable between horsepower and cylinder configurations.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5859-1
• Charging Output: 9 Amp
• Weight: 1.44 pounds
• Color: White
• Engine Type: Gasoline
• Mounting Type: Engine Mount
• Recommended Uses: For Fresh Water, For Inflatable Boats
• UPC: 808282392475
• Compatible Serial Number Ranges: 80 (80, 800) 4 cyl: 4831999-6432900; 85 (850) 4 cyl: 4366802-4831998
• OEM Cross Reference: Mercury 398-5454A26, 398-5454A22, 398-5919A7, 398-5919A3; CDI 174-5454K1; Mallory 9-25503

Fitment

• Mercury/Mariner 80 (80, 800) 4-cylinder outboard, serial numbers 4831999 to 6432900
• Mercury/Mariner 85 (850) 4-cylinder outboard, serial numbers 4366802 to 4831998

Replaces (OEM)

• Mercury 398-5454A26
• Mercury 398-5454A22
• Mercury 398-5919A7
• Mercury 398-5919A3
• CDI 174-5454K1
• Mallory 9-25503

Frequently Asked Questions

What outboards does the Sierra 18-5859-1 stator fit? The Sierra 18-5859-1 fits Mercury/Mariner 80 (80, 800) 4-cylinder outboards with serial numbers 4831999 to 6432900, and 85 (850) 4-cylinder outboards with serial numbers 4366802 to 4831998. Check your engine's serial number tag before ordering since it is not interchangeable with other horsepower models.

Is this a genuine Mercury part or aftermarket? The 18-5859-1 is a Sierra-branded aftermarket stator built as a direct replacement for the original Mercury charging stator, engineered to meet or exceed OEM charging performance.

What OEM Mercury part numbers does the 18-5859-1 replace? It replaces Mercury 398-5454A26, 398-5454A22, 398-5919A7, and 398-5919A3, and is also cross-referenced to CDI 174-5454K1 and Mallory 9-25503.

How many amps does this stator produce? The Sierra 18-5859-1 is a 9 amp charging stator, matching the output of the original equipment stator it replaces.

How much does the stator kit weigh? 1.44 pounds is the shipping weight of the Sierra 18-5859-1 stator kit.

Can I use this stator in saltwater? The Sierra 18-5859-1 is recommended for fresh water use and is also suited to inflatable boat applications.

What does the stator do on my outboard? A stator is the stationary charging coil mounted inside the flywheel housing; as the flywheel spins past it, it generates AC current that feeds the rectifier to charge the battery and power ignition. The 18-5859-1 performs this function on compatible Mercury/Mariner 4-cylinder outboards.

How do I know if my 80 HP or 85 HP Mercury needs this stator model versus another? Match your engine's serial number against the ranges for the 18-5859-1: 4831999-6432900 for the 80 (80, 800) 4-cylinder, or 4366802-4831998 for the 85 (850) 4-cylinder. Outside those ranges, a different Sierra stator part number applies.

What color is the stator housing? The Sierra 18-5859-1 has a white housing finish.

Does this kit include mounting hardware? The listing covers the Sierra 18-5859-1 stator unit itself; check the included components before installation to confirm whether your specific engine reuses existing mounting hardware.

Is the 18-5859-1 a direct bolt-in replacement? Yes, for the covered Mercury/Mariner 80 and 85 HP 4-cylinder serial ranges, the Sierra 18-5859-1 is designed as a direct replacement for the original stator without modification.

Why does the engine type matter for this stator? The Sierra 18-5859-1 is built for gasoline-powered outboard engines, matching the fuel and ignition system of the covered Mercury/Mariner 4-cylinder models.