John Deere X350 726cc Riding Lawn Mower Starter Motor | 12V 0.9kW 10T CCW | OE AM138068

A no-crank on an X350 is usually one of three things: a flat battery, a solenoid that clicks without passing current, or a starter that turns slowly and smells hot. This is the third one, sold as a bare motor so you replace only the part that failed.

The X350 runs the Kawasaki V-twin family at 726 cc. That engine uses a 10-tooth pinion turning counter-clockwise as you look at the drive end, which is what this motor is built to. Put a 9-tooth or a clockwise unit on it and the pinion will grind against the ring gear instead of meshing.

Inside is a permanent-magnet direct-drive layout: no reduction gearset, no separate field coil. The stator and the rotor are both copper wound, the barrel is plated steel, and the drive end carries a sealed bearing rather than a bushing. That combination is what keeps cranking speed up when the engine is cold and the oil is thick.

The mounting is a two-bolt flange with 8 mm holes and a pilot spigot that centres the motor on the engine boss. You do not need to shim it or drill anything. Bolt it up, refit the original bolts, and the pinion depth stays where the factory put it.

Before you fit it, disconnect the negative cable and clean both battery posts and the ground strap at the frame. A starter that is asked to work through a corroded ground will overheat and come back. Check the solenoid studs as well; a pitted stud costs cranking current just as surely as a bad motor does.

Do not crank for more than ten or fifteen seconds at a stretch. These motors are intermittent duty. If the engine does not catch, let the motor cool for a couple of minutes and look at fuel and spark before you try again.

The X350 was introduced with the X300 series in 2016 and has been sold with both the 42A side-discharge deck and the 42M mulch deck. The engine and the starter boss are the same across those deck options, so deck choice does not change the fit.

What this listing does not include: the starter solenoid, the ignition relay, the mounting bolts and the heat shield. On a John Deere these are separate numbers and they fail on their own schedule. If your solenoid clicks and nothing turns, the solenoid is the part to change first.

We do not publish a torque figure, a current draw or a no-load speed for this motor, because nobody gave us a test sheet for it. What we can tell you is the voltage, the power class, the tooth count, the rotation and the flange pattern. Everything else is guesswork and we would rather leave it blank.

For workshops holding stock: one carton, one motor, no core charge. We ship from stock in 15 to 30 days depending on the quantity, and the motor carries a 12-month replacement warranty against winding and bearing failure.

Fitment is listed against the X350 only. Other X300 tractors share the engine family but not always the same starter boss, so check the part number on the motor you are taking off before you order.