jetunit Mercury 2-Stroke Outboard Stator 40-85 HP — 3&4 Cylinder Direct-Fit, Restores Charging

JETUNIT stator engineered as a direct-fit replacement for select Mercury 2-stroke outboard models from 40 to 85 HP, restoring reliable charging and ignition performance.

If your Mercury outboard is showing weak charging, dimming lights, or trouble starting, a worn stator may be the cause. This JETUNIT stator is designed to match multiple OEM part numbers and fits a range of 3- and 4-cylinder 2-stroke engines. It provides the electrical generation needed for ignition and battery charging while meeting the physical fit and connector layout common to the compatible Mercury models.

Which Mercury engines and part numbers does this stator replace?

The JETUNIT stator covers a broad set of Mercury 2-stroke outboards in the 40–85 HP range, working with both 3- and 4-cylinder configurations depending on your model year. Check the OEM references to confirm match before ordering.

• Compatible horsepower: 40, 45, 50, 55, 60, 65, 70, 75, 80, 85 HP
• Fits 3-cylinder and 4-cylinder 2-stroke engines used across various Mercury ranges
• Matches many OEM part numbers including 174-5454K1, 5454A21, 5454A22, 5454A25, 5454A26, 398-5454A21, 832075A20 and more
• Always verify the manufacturer’s recommended part number for your exact engine serial

How will installing this stator affect my boat’s electrical system?

Replacing a failing stator with this unit restores the alternator/charging function so your battery stays charged and electrical accessories operate correctly. It helps stabilize ignition power, which can improve starting consistency and overall electrical reliability.

• Restores charging to maintain battery voltage while running
• Ensures stable power for ignition coils and onboard electronics
• Reduces flickering lights and dimming under load
• Designed to fit factory mounting points and connector layouts for hassle-free swap

What should I expect during installation and maintenance?

Installation follows the same steps as replacing any outboard stator: remove the flywheel, swap the old stator for the new unit, route the wiring, and reassemble. No special machining is typically required when the part number and model match. Routine checks of connections and insulation will prolong service life.

• Standard removal of flywheel and access to the stator plate required
• Match connector pinout and mounting screw positions before tightening
• Inspect wiring harness and ground points when installing
• Perform charging voltage check after installation to confirm proper output

Who is this for? Boaters, DIY marine mechanics, and professional technicians who need a reliable, OEM-replacing stator for Mercury 2-stroke outboards in the 40–85 HP range will find this JETUNIT unit suitable. It’s aimed at anyone seeking a cost-effective, direct-replacement component that restores charging and ignition functionality. Make sure you confirm your engine’s exact part number and cylinder configuration before purchase; JETUNIT provides a one-year warranty and customer support to assist with fit questions and any post-purchase issues.