Starter Motor Mercury Mariner 10-30HP 4-Stroke 50-853805T03 9T

• Application-focused replacement for selected Mercury / Mariner four-stroke outboards
• 12 V, 0.6 kW electric starter motor
• 9-tooth drive pinion — not 10 tooth
• Counter-clockwise (CCW) rotation
• Permanent-magnet direct-drive design
• Starter motor supplied as shown; separate relay/solenoid not included

The removed starter or the engine parts catalogue should show one of the following reference families:

Note: these are OEM identification references, not the brand of the aftermarket unit supplied.

Not a universal 25–60 HP starter: do not order for 40, 50 or 60 HP four-stroke engines solely because an old catalogue or listing shows the same horsepower range. Confirm the exact OEM number for the individual engine.

1. Match the reference on the old starter to the OEM list above.
2. Confirm 12 V, CCW rotation and a 9-tooth pinion.
3. Compare the body, mounting lugs and terminal position with the product photographs.
4. Confirm the complete Mercury/Mariner model and serial number in the engine parts catalogue.

One starter motor as pictured. Mounting fasteners, wiring, starter relay/solenoid and installation tools are not included unless clearly shown.

Is this starter 9 tooth or 10 tooth?

It is the 9-tooth version. Count the teeth on the existing starter before ordering.

Does it fit every Mercury 25–60 HP four-stroke?

No. It is intended for selected 10–30 HP applications using the listed OEM family. Horsepower alone cannot confirm fitment.

Is it a genuine Mercury part?

No. It is a new aftermarket replacement; Mercury references are supplied only to identify compatibility.

What information is needed for a fitment check?

Send the full engine model, serial number, year if known, and the number stamped on the removed starter.