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| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £4.99 | 1 to 2 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 5 to 7 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
Product Number: 18331N
The WAI 18331N is a brand-new 12V PMGR starter motor. It is designed as a direct replacement for Mitsuba original-equipment units, cross-referencing Remy RS41186, Mitsuba SM-8, SM13298 and SM8, and Polaris references 3083646, 3083760, 3084403 and 3085393. Supplied as a complete unit, it is a straightforward drop-in solution for machines fitted with a Mitsuba PMGR starter.
The PMGR (Permanent Magnet Gear Reduction) design uses a high-field permanent magnet stator and an integral reduction gear set to deliver strong cranking torque at lower current draw than a conventional direct-drive unit. Clockwise rotation matches the original Mitsuba specification, and the 12V operating voltage suits standard single-battery systems common across the applications this motor serves.
Being brand new — not remanufactured — means there are no worn brushes, no rebuilt solenoids, and no uncertainty about residual service life. WAI manufactures to OE tolerances, so mounting interfaces, pinion engagement, and electrical connections align directly with the original Mitsuba fitment.
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PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specializing in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalog of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
| Type | Starter Motor |
|---|---|
| Manufacturer | Mitsuba |
| Design | PMGR |
| Voltage | 12V |
| Rotation | CW |
| Condition | Brand New |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
Exploring the WAI Starter Motor and Alternator at Partsformachines.com Introduction: In the Plant and Agriculture sector, a starter motor and alternator are parts that ensure a machine runs smoothly. At Partsformachines.com we have partnered with WAI, a global manufacturer of auto and plant machinery parts to off...
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Delivery Estimate: 1 to 2 working days
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| Technical Specification | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | 19016N | 32568N | 32734N | MS291 | MS84 | 30584N | MS399 | S4030 | S4042 | S9002PR | S9020 | S9033 | S9406S | S9440P | 17184N |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | |
| Design | PMOSGR | OSGR | PLGR | PLGR | PLGR | DD | |||||||||
| Manufacturer | Mitsuba | Poongsung | Mitsuba | Mahle | Mahle | Mahle | Electroprecizia | ||||||||
| Power | 1.6 | 2.0 | 4.2 | 4.2 | 3.2 | 3.0 | 2.0 | 2.1 | 1.4 | 2.2 | 1.2 | 2.2 | 3.0 | ||
| Rotation | CCW | CW | CW | CW | CW | CW | CW | CW | CW | CW | CW | CW | CW | ||
| Teeth | 9 | 9 | 10 | 11 | 10 | 10 | 11 | 19 | 12 | 11 | 9 | 11 | 9 | ||
A. The WAI 18331N cross-references 8 OE part numbers. These include Remy RS41186, Mitsuba SM-8, Mitsuba SM13298, Mitsuba SM8, Polaris 3083646, Polaris 3083760, Polaris 3084403, and Polaris 3085393. Search our cross-referenced catalogue by any of these OEM numbers to confirm suitability for your machine, or ask Simon if you need further guidance. Every OE cross-reference shown is backed by our Fit Guarantee.
A. Yes. Remy RS41186 is one of the 8 OE references this part cross-references. If your machine is currently fitted with the Remy RS41186, the WAI 18331N is the listed replacement. Use the cross-referenced catalogue or ask Simon to confirm fitment against your machine model.
A. PMGR stands for Permanent Magnet Gear Reduction. This design uses a permanent magnet stator in place of wound field coils, combined with an internal reduction gear set. The result is strong cranking torque delivered at a lower current draw than a conventional direct-drive motor — benefits that matter particularly in cold starts or where battery capacity is limited. The WAI 18331N is built to this PMGR design to match the original Mitsuba specification.
A. The WAI 18331N is supplied brand new — not remanufactured or reconditioned. There are no previously worn components such as brushes or rebuilt solenoids, so the unit has full service life from the point of installation.
A. The WAI 18331N operates at 12V and has clockwise (CW) rotation, matching the original Mitsuba PMGR specification. Ensure your application requires clockwise rotation before fitting.
A. Compatible spares and accessories are shown on the Related Accessories tab of this product page, and common parts across the brands we stock are in our Parts & Spares section.
A. Yes — ask Simon, or WhatsApp our team on 07754 288583 with any questions about specifications, suitability, or compatibility.
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