Stator: 5 Checks Before You Order
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Stators fail quietly: the battery stops charging, the bike cuts out once the battery runs flat, or the lights dim at idle. Replacements can look identical and still not fit, because the bore, the pole count, the wiring or the lead length can all differ. This guide covers the checks we recommend before you order, using real examples from our own range.
Prefer to read? The full guide is below.
First: is it really the stator?
- With the engine off, unplug the stator and measure the resistance between the charging wires. Compare the reading with the value in the listing's technical specs. On our KTM SX-F stator for 2011–2015, for example, it is 0.4 Ω ± 20%.
- Measure from each charging wire to ground. It should read open circuit. Continuity to ground means the stator has failed.
- If your stator has a pickup coil, check it against the listed value too.
- Test the regulator rectifier as well. A failed regulator can damage the stator, and fitting a new stator to a bad regulator can repeat the failure. See our regulator rectifier guide.
Check 1: Match the part number
Look for the number on your old stator or in your parts manual, then find it in the cross-reference table on the listing. The KTM 250 / 350 SX-F is a good example:
| Years | OEM part number | Our stator |
|---|---|---|
| 2011–2015 | 77139004000, 77239004000 | 80 W stator, 29 mm bore |
| 2015 onwards | 79239004000 | 80 W stator, 32 mm bore |
Both are 80 W, with 12 poles and 4 wires. The bore is different, and 2015 appears in both ranges, so the part number decides.
Check 2: Size and poles
Measure the inner and outer diameter, then count the poles. Stators with the same dimensions can still be different parts. These three are all 42 mm inside and 115 mm outside:
- Can-Am Defender, Maverick Sport & Traxter: 12 poles
- Honda CBR 1000 RR: 15 poles
- Triumph Street Triple 675 R, Speed Triple R & Tiger Sport: 18 poles
Check 3: Wires, plugs and pickup coil
| Stator | Wires | Plugs | Pickup coil |
|---|---|---|---|
| Ducati Superbike 749 / 999 / 1098 / 1198 | 3 | 1 | No |
| Yamaha YFM 450 Kodiak 2018–2024 | 5 | 2 | Yes |
| Honda CRF 1000 Africa Twin (manual) 2016–2019 | 12 | 3 | Yes |
Check 4: Standard or high output
- High output: our 80 W KTM stators and the 200 W Honda XR 600 R stator give extra power for lights and accessories.
- Lighting kits: the 90 W kit for the Honda CRF 450 X comes with its own regulator and converts the lighting circuit from AC to DC.
Check 5: The exact model and year
The Suzuki V-Strom DL 1000 uses two stators with the same size (54 × 119 mm), 18 poles, 5 wires and 2 plugs. The difference is the lead length and the part number:
| Years | OEM part number | Lead, grommet to plug |
|---|---|---|
| 2002–2009 & 2012 | 32101-06G00 / 06G10 / 06G11 | 430 mm |
| 2014–2019 (and DL 1050 2020–2025) | 32101-31J00 (DL 1050: 32101-06L00) | 270 mm |
Quick checklist before you order
- Stator at fault: resistance and ground tests done, regulator checked?
- Part number: is it in the cross-reference table?
- Size and poles: inner and outer diameter, pole count?
- Wires, plugs and pickup: does the count match?
- Output: standard, high output or lighting kit?
- Model and year: does your exact machine appear in the fitment guide?
FAQ
Should I replace the regulator at the same time?
Test it first. If the regulator has failed or the connector is burnt, replacing both avoids damaging the new stator.
Will a high-output stator work with my original regulator?
The listing for our 80 W KTM stator (2011–2015) states that it works with the original regulator rectifier and wiring. Check the listing for your model.
Is the pickup coil included?
On stators that have one, it is usually supplied fitted. Check the listing's "What is included" section.
Not sure which stator you need? Send us your part number or a photo of your old stator before you order. Browse all stators. More buying guides: regulator rectifiers, starter motors and power trim & tilt motors.