Sierra 18-5865 Stator, Replaces Mercury 398-5704A7, for Mercury 65 (650) and 70 HP 3 Cylinder Outboards

The Sierra 18-5865 Stator is a replacement ignition stator built for Mercury 65 (650) and 70 HP 3 cylinder outboard motors. The stator is the stationary charging/ignition component mounted around the flywheel that generates the electrical signal used by the ignition system, and a failed or weak stator is a common cause of no-spark or intermittent-spark conditions on these outboards. This unit is constructed of metal with a white finish and is built to meet or exceed the output and fit of the original equipment part it replaces.

Fitment is engine-specific by serial number range: it fits Mercury 65 (650) HP 3 cylinder outboards in the 4382057 to 4571651 serial number range, and Mercury 70 HP 3 cylinder outboards in the 4571652 to A996141 serial number range. Confirm your outboard's horsepower, cylinder count, and serial number before ordering, since stators are not interchangeable across engine families. The Sierra 18-5865 is a direct cross to several OEM and aftermarket part numbers, making it easy to identify against the number stamped on your old unit or listed in your parts manual.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5865
• Product Type: Outboard Motor Stator
• Material: Metal
• Color: White
• Engine Type: 4 Stroke
• Mounting Type: Engine Mount
• Fuel Type: Gasoline
• Maximum Horsepower: 70 Horsepower
• Weight: 3.02 pounds
• UPC: 808282112103

Fitment

• Mercury 65 (650) HP, 3 cylinder, serial number range 4382057 to 4571651
• Mercury 70 HP, 3 cylinder, serial number range 4571652 to A996141

Replaces (OEM)

• Mallory 9-25506
• Mercury 398-5704A7
• Mercury 398-5704A2
• Mercury 398-5704A5

Frequently Asked Questions

What engines does the Sierra 18-5865 stator fit? It fits Mercury 65 (650) HP 3 cylinder outboards in the 4382057 to 4571651 serial number range, and Mercury 70 HP 3 cylinder outboards in the 4571652 to A996141 serial number range.

Is the Sierra 18-5865 the same as the Mercury 398-5704A7 stator? Yes, the Sierra 18-5865 is a direct cross reference to Mercury 398-5704A7, as well as to Mercury 398-5704A2, Mercury 398-5704A5, and Mallory 9-25506.

How much does this stator weigh? The Sierra 18-5865 stator weighs 3.02 pounds.

What material is the stator made from? It is constructed of metal with a white finish.

How do I know if my Mercury outboard needs a new stator? A failing stator commonly causes no-spark or intermittent-spark conditions; if your Mercury 65 (650) or 70 HP 3 cylinder outboard is hard to start or losing spark, the stator is a common suspect and the Sierra 18-5865 is the replacement for that application.

How do I confirm my outboard uses the 18-5865 stator and not a different part? Check your Mercury outboard's serial number against the two supported ranges: 4382057-4571651 for the 65 (650) HP 3 cylinder engine, or 4571652-A996141 for the 70 HP 3 cylinder engine, since stators are serial-number specific.

Is the Sierra 18-5865 genuine Sierra or aftermarket? It is a genuine Sierra part, manufactured to meet or exceed the output and fit of the original Mercury equipment it replaces.

What is included when I order this stator? You receive one Sierra 18-5865 stator; no additional wiring harness or mounting hardware is included.

Does the 65 HP and 70 HP application use the same stator? Yes, the Sierra 18-5865 covers both the Mercury 65 (650) HP and 70 HP 3 cylinder outboards, but only within the specific serial number ranges listed for each engine.

Can I cross-reference this part using my old Mallory stator? Yes, the Sierra 18-5865 replaces Mallory 9-25506 in addition to the Mercury OEM numbers 398-5704A7, 398-5704A2, and 398-5704A5.