Polaris 800cc ATVs and UTVs are known for flywheel failure caused by the low-quality epoxy used to hold the magnets in the original unit. When that epoxy breaks down the magnets work loose, and the result ranges from a charging fault to serious damage inside the magneto housing. This replacement flywheel is built specifically to remove that weakness: it uses a high-temperature epoxy superior to the original equipment, and adds a high-grade steel cap around the magnets so they cannot detach.
Each flywheel is precisely balanced before it ships. The manufacturer specifically warns against trying to repair a failed original with epoxy products such as JB Weld - patch repairs tend to leave the magnets misaligned or incorrectly spaced, allow oil contamination to reach the bond, and rarely hold up over time. Fitting a properly capped and balanced flywheel is the durable fix. This unit cross-references to Polaris OEM number 4013968.
Key Features
- High-temperature epoxy, superior to the original equipment
- High-grade steel capping prevents magnet detachment
- Precisely balanced flywheel
- Addresses the known Polaris 800 flywheel failure mode
- Direct replacement for Polaris OEM 4013968
- A durable alternative to attempting an epoxy repair
Technical Specs
| Specification |
Detail |
| Exterior diameter |
131 mm and 168 mm |
| Interior diameter |
109 mm |
| Interior diameter, centre housing |
29 mm |
| Exterior diameter, centre housing |
40 mm |
| Thickness (exterior) |
60 mm |
| Thickness (interior) |
49 mm |
| Part number |
RMS120-108417 |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Polaris Ranger 800 6x6 |
2012-2017 |
| Polaris RZR 4 800 |
2012-2017 |
| Polaris Sportsman 800 Forest EFI |
2012-2017 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 4013968 |
Polaris |
Frequently Asked Questions
Does this fit without modification?
Yes. It is a direct replacement for Polaris part 4013968 and matches the original dimensions, so it fits the standard magneto housing on the listed 800cc machines without machining or adaptation.
What is included?
The capped magneto flywheel itself. Fixings, keys and seals are not listed as supplied, so reuse or renew your own hardware as required.
How do I know my original flywheel has failed?
The classic sign on these Polaris 800 engines is magnets that have come loose from the flywheel, which shows up as a charging or ignition fault, an unusual noise from the magneto side of the engine, or debris and epoxy fragments found inside the stator cover once it is opened. Inspect the flywheel face for cracked or displaced epoxy around the magnets.
Can I just glue the magnets back in with JB Weld?
The manufacturer advises against it. Epoxy repairs commonly leave the magnets misaligned or incorrectly spaced, they can be undermined by oil contamination, and they do not hold up over the long term. That is the failure this capped and balanced flywheel is designed to remove permanently.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
