



What this thing is
It is a 12V starter for the 170cc engine on XAG P100 agricultural drones. It bolts on where the old one came off, cranks the flywheel, the engine catches, the pinion slides back out. That is the whole job.
Ours carries OE XG040012, with a ten-tooth pinion turning counter-clockwise. 12V, 1.2kW, 10 teeth, CCW. All of that comes from the listing, not from guesswork.
What happens when you hit the button
Power hits the solenoid before it ever reaches the motor. That small coil does two things at once. It throws the pinion down the shaft until the teeth grab the ring gear, and it closes the fat contact that lets the amps through.
Then the armature turns, and the engine comes with it.
The moment fuel lights off, the pinion pulls back. Good thing too. Leave it in mesh and the gear train howls at full engine speed.
Here is the part people get wrong: teeth and rotation matter as much as voltage. Ten teeth have to line up with a matching ring gear. Spin it the wrong way and both pieces are scrap within seconds.
What we can tell you, and what we cannot
Voltage, power, teeth, rotation. Known, straight off the listing.
Housing material? Winding material? Spigot diameter, hole pitch, terminal layout, weight? Not published anywhere we would believe.
So we left those blank. Filling them with numbers borrowed from a similar-looking motor would be easy, and dishonest.
Send a photo of your old starter and we will compare the mounting face against it.
How they fail
Usually slowly. A grumbling crank that sounds like a dying battery, except the battery tests fine.
Sometimes all at once. One heavy click out of the solenoid, then silence.
Other times it starts fine cold and flatly refuses once things are hot.
Check the cheap items before you spend. Load-test the battery. Wire-brush the terminals and the engine ground. Make sure the relay really closes. Half the dead-starter calls out there turn out to be one of those three.
Before you order
Match OE XG040012. Confirm 12V, 1.2kW, 10 teeth, counter-clockwise. Compare terminal positions and the mounting face against the unit in your hand.
Disconnect the negative lead first. Fit it, turn the pinion by hand, feel for proper mesh, then press the button.
What is missing
No substitute OEM number. Nothing verifiable exists in public, and a made-up cross-reference is worse than a blank.
No mounting dimensions. No weight.
Warranty six months, MOQ 20, lead time 10-15 days. Those follow the catalog pattern and still need your confirmation before this goes live.
| Brand | Model | Model Code | Year |
|---|---|---|---|
| XAG | XAG P100 | P100 | 2022 |