POLARIS 4018940 Starter Motor Asy

( Manufacturer Part Number: 4018940 ), ( Part Type: Starter Motor ), ( Compatible Year: Multiple ), ( Machine Type: Atv )

Review POLARIS Starter Motor Asy fits SPORTSMAN 570 2021

The **Polaris 4018940 2021 Sportsman 570 Starter Motor (ASY)** is a precision-engineered, high-performance component designed exclusively for the 2021 Polaris Sportsman 570 ATV, ensuring reliable ignition and smooth startup in even the most demanding conditions. This starter motor is built to Polaris s stringent quality standards, featuring a robust, durable construction that combines a heavy-duty solenoid and a high-torque electric motor to deliver consistent power with every crank. Engineered with an **ASY (Alternator Starter Yoke)** configuration, this starter is optimized for seamless integration with the Sportsman 570 s electrical system, providing efficient current flow and reducing wear on the alternator while enhancing overall reliability. The motor s compact yet sturdy design ensures it fits snugly within the ATV s engine bay, minimizing space constraints without compromising performance. Constructed from high-grade materials, including reinforced steel and corrosion-resistant coatings, this starter motor is engineered to withstand the rigors of off-road use, extreme temperatures, and prolonged exposure to moisture, dust, and debris common challenges faced by ATV enthusiasts. Whether tackling rugged trails, navigating muddy terrain, or enduring cold starts in winter conditions, this starter motor delivers dependable performance, reducing the risk of unexpected breakdowns and ensuring your Sportsman 570 remains ready for action. Ideal for both original equipment replacement and aftermarket upgrades, the **Polaris 4018940 2021 Sportsman 570 Starter Motor (ASY)** is a critical component for maintaining the longevity and operational excellence of your vehicle, offering peace of mind with every ride.

### **Pros and Cons of Buying a Polaris Sportsman 570 Starter Motor (Part #4018940, 2021 Model, ASY)**

1. **Direct Compatibility** The starter motor (part #4018940) is specifically designed for the 2021 Polaris Sportsman 570, ensuring a perfect fit without modification. This reduces the risk of installation issues or damage to the vehicle s electrical system.

2. **Reliability** Polaris is known for producing durable components, and the Sportsman 570 starter motor is no exception. It is built to handle the demands of frequent starts, especially in cold weather or high-demand situations like towing or frequent acceleration.

3. **Easy Installation** As an ASY (Aftermarket Serviceable Yield) part, it is designed to be straightforward to replace. Many users report that swapping out the starter takes less than an hour with basic tools, reducing labor costs if you re doing it yourself.

4. **Warranty Coverage** If purchased from an authorized Polaris dealer or a reputable aftermarket supplier, this part may come with a warranty (typically 12 24 months). This provides peace of mind in case of premature failure.

5. **Cost-Effective Replacement** Replacing a faulty starter is often cheaper than overhauling the entire electrical system or dealing with a dead battery repeatedly. The cost of the starter itself is a fraction of the labor or potential damage costs associated with a failed starter.

6. **Improved Performance** A new starter ensures smooth engagement of the flywheel, reducing jerking or grinding noises that can occur with worn-out starters. This leads to a more pleasant riding experience.

7. **Preventative Maintenance** Replacing the starter proactively (before it fails) can prevent unexpected breakdowns, especially during long trips or in remote areas where assistance may not be readily available.

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1. **Upfront Cost** While the starter itself is reasonably priced (typically $150 $300 depending on the source), purchasing from an authorized dealer may be more expensive than third-party sellers. However, third-party parts may lack warranty support.

2. **Potential Counterfeit Parts** Buying from unverified sellers (e.g., eBay, Amazon, or unlicensed shops) risks receiving counterfeit or low-quality parts. These may fail prematurely or damage the vehicle s electrical system. Always verify the seller s reputation and authenticity.

3. **Installation Challenges** While the starter is designed for easy replacement, some users may encounter difficulties if they lack mechanical experience. Improper installation (e.g., loose connections, incorrect torque) can lead to further issues like electrical shorts or starter failure.

4. **Battery Health Consideration** A failing starter often correlates with a weak battery. If the battery is old or degraded, replacing just the starter may not solve the problem long-term. Testing and replacing the battery if necessary is advisable.

5. **Limited Lifespan** Like all mechanical components, starters have a finite lifespan (typically 5 10 years or 50,000 100,000 starts). If the vehicle is frequently used in harsh conditions (extreme cold, heavy loads), the starter may wear out faster.

6. **Compatibility with Modifications** If the Sportsman 570 has aftermarket modifications (e.g., performance upgrades, custom wiring), the starter may not function optimally. Always check compatibility with any installed accessories.

7. **Professional Installation Costs** If you re not comfortable with DIY repairs, labor costs at a dealership or mechanic can add $100 $200 to the total expense. However, this is often worth it for peace of mind.

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The **Polaris Sportsman 570 starter motor (part #4018940, 2021, ASY)** is a practical and reliable replacement for a failing starter. Its direct compatibility, ease of installation, and Polaris-backed quality make it a strong choice for most owners. However, the decision should consider factors like sourcing authenticity, battery health, and whether DIY installation is feasible.

For most users, **replacing the starter is a cost-effective solution** to restore reliable starting performance and avoid the inconvenience of a dead ATV. If the vehicle has other electrical issues or the battery is old, addressing those simultaneously will extend the lifespan of the new starter.

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1. **Purchase from a Trusted Source** Buy the starter from an **authorized Polaris dealer, official Polaris parts distributor, or a well-reviewed aftermarket supplier** (e.g., Polaris Outdoors, Amazon with verified seller ratings, or specialty ATV parts stores). Avoid unknown sellers to prevent counterfeit parts.

2. **Check Battery Health** Before installing the new starter, test the battery s voltage and capacity. Replace the battery if it s weak (below 12.6V when the ATV is off) to ensure the starter has sufficient power to engage.

3. **DIY or Professional Installation?**

- If you have basic mechanical experience and tools, **DIY installation is feasible** and saves labor costs.

- If unsure, **have a mechanic or dealership perform the installation** to ensure proper connection and avoid electrical issues.

4. **Consider a Starter with Solenoid** Some aftermarket starters include a built-in solenoid, which can simplify installation and improve reliability. Verify if the part you re purchasing includes this feature.

5. **Monitor Performance Post-Installation** After replacing the starter, test the ATV in different conditions (cold starts, high-demand situations) to confirm the new starter is functioning correctly.

6. **Keep Records** If the part comes with a warranty, **save the receipt and installation date** in case of early failure. Document any issues with the seller or manufacturer for potential returns or replacements.

**Final Verdict:** **Worth the purchase** for most owners, provided the part is sourced correctly and installation is done properly. It s a straightforward upgrade that restores functionality and prevents future breakdowns.

Details:

However, there may be residual fluid in, on, or around the part. I test vehicles before tear them down. With that being said, this is a used part. I will always do my best to make sure the parts that sell are in good usable condition.

ENGINE/MOTOR CARBURETOR PARTS, All engine parts have been drained of oil and fluids. Shipping price stated is for the lower 48 states only. Sometimes these parts sit on a shelf for several weeks/months prior to selling them. Parts may require some cleaning and adjustments for proper installation.

Engine parts should be properly cleaned and lubricated prior to assembly. The dictionary defines the word used as follows: Not New, Previously Owned. #2 - People installing them on an incorrect machine. #1 - People using the part for testing.

2021 Polaris Sportsman 570 Starter Motor Asy 4018940. All Carburetor/Intake parts have been drained of fuel. I also inspect each part before taking pictures.

part #: 4018940 prices

• $55.99-$299.99

specifications electricacompone:

• for models: 570, Sportsman
• for makes: Polaris
• for years: 2021
• mpn: 4018940
• part type: Starter Motor
• compatible year: Multiple
• machine type: Atv

seller electricacompone:

• city: Lake Crystal, Minnesota
• rating: 99.9%
• # reviews: 17903

payments electricacompone:

• wallet: Apple-pay
• other
• credit card: Mastercard

shipping electricacompone:

• service: Standard
• cost: $0.00
• type: Fixed
• transit: 2-5 Days
• class: Standard

returns electricacompone:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

general electricacompone:

• ATV, Side-by-Side UTV Parts Accessories > Electrical Ignition Components > Other Electrical Ignition Components
• condition: Used

offer electricacompone:

• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0
• started: May 7, 2026

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