Mercury 40 50 60HP 4-Stroke Starter Motor 12V 9T CCW | Replaces 50-859377T

Starter motor for Mercury and Mariner 40, 50 and 60HP four-stroke outboards, an aftermarket replacement for 50-859377T. Nine teeth, counter-clockwise rotation, permanent magnet direct drive, 12 volt.

OE Reference Numbers

Primary reference: 50-859377T

Substitute references: 50-884044T, 50-888161T, 50-893888T

Cross references reported by replacement part catalogs: Sierra 18-6435, ARCO 5360, Lester 5901, J&N 410-21095, Arrowhead SAB0168, API MOT3023N

Buyer search terms: Mercury 60HP starter motor, 50-859377T starter, Mercury 40HP 4-stroke starter, Mariner 50HP starter motor, 9 tooth CCW starter

Reference Specifications

System voltage: 12V DC

Rotation: counter-clockwise (CCW)

Pinion: 9 teeth

Type: permanent magnet direct drive (PMDD)

Gear outside diameter: 29.4mm

Case length: 127mm

Mounting: 2 holes, 8.1mm, no thread

Weight: about 3.2kg

Numbers above come from compatible catalogs and our own stock. Not Mercury drawings. Put both starters side by side before anything goes on.

Fitment and Purchase Checks

Mercury and Mariner 40, 50, 60HP four-strokes, 2001 and up. EFI, Command Thrust, SeaPro too, out to about 2018 or 2020. This is the long 9-tooth starter. The 50-822462 family looks close but runs 10 teeth on a wider gear. That one belongs to the 30 to 60HP two-strokes and the three-cylinder four-strokes. Count your old pinion teeth first. They do not swap.

Why This Unit

Slow crank, then a click. That is the usual story. Brushes wear, magnets lose grip, the starter pulls more current than the battery has. Permanent magnet direct drive here. No field coil to fail, fewer parts to go wrong. Nine teeth, counter-clockwise, 29.4mm gear. Flywheel mesh stays right.

For Buyers and Distributors

Six months warranty. 20 pieces minimum. Ships in 10 to 15 days. RoHS, REACH and ISO9001 papers on file. Tell us the engine model, the old number, the quantity and the port. Quote goes back same day.

Aftermarket notice

This listing is an aftermarket replacement part supplied by StarterStock. We are not affiliated with, authorized by, or endorsed by any original equipment manufacturer. OE numbers, model names and brand names are quoted for identification and fitment matching only, and remain the property of their respective owners.