This is a brand new aftermarket detonation sensor supplied as a direct replacement for the original unit. The knock sensor is what tells the engine management when combustion is starting to detonate, allowing the ECU to pull ignition timing before the pistons take damage. When the sensor fails or its signal drops out, the ECU loses that protection and typically defaults to a conservative map, so the machine runs down on power and the fault light comes on.
The sensor body measures 41 mm long, 27 mm wide and 18 mm high, with an 8.3 mm thread diameter, and it carries a single 470 mm wire into one plug with two terminals. Fitting is plug-and-play: it threads into the original boss and connects to the existing harness, so no cutting or splicing is needed. Every unit is tested before shipping, and the manufacturer invites you to compare the item against your original part before fitting. It cross-references to BRP numbers 420664031, 420664030 and 290664030, to 270000484, and to Polaris 2410369.
Key Features
- Brand new aftermarket detonation sensor
- Direct replacement for the original unit
- Plug-and-play, direct fit, easy installation
- Single 470 mm wire into a two-terminal plug
- 8.3 mm thread, matching the original mounting
- Covers Can-Am, Polaris and Ski-Doo applications
- Every unit tested before shipping
Technical Specs
| Specification |
Detail |
| Width |
27 mm |
| Length |
41 mm |
| Height |
18 mm |
| Thread diameter |
8.3 mm |
| Number of plugs |
1 |
| Number of terminals |
2 |
| Number of wires |
1 |
| Wire length |
470 mm |
| Part number |
RMS140-108543 |
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 |
| Can-Am Spyder 1330 |
2000-2025 |
| Polaris 800 RMK |
2000-2025 |
| Ski-Doo Renegade 600 |
2000-2025 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 420664031 |
BRP (Can-Am / Ski-Doo) |
| 420664030 |
BRP (Can-Am / Ski-Doo) |
| 290664030 |
BRP (Can-Am / Ski-Doo) |
| 270000484 |
OEM cross reference |
| 2410369 |
Polaris |
Frequently Asked Questions
Do I need to modify anything to fit it?
No. It is a plug-and-play direct fit. The 8.3 mm thread matches the original mounting boss and the single 470 mm wire terminates in the same two-terminal plug, so it connects to the existing harness without altering the loom.
What is included?
One detonation knock sensor with its 470 mm lead and plug, tested before shipping.
How do I know the old knock sensor has failed?
The usual signs are a fault or check-engine light with a knock sensor code stored, a noticeable loss of power because the ECU has retarded the timing as a precaution, or an engine that goes into a limited or limp mode. Inspect the sensor lead and plug for chafing and corrosion first, and check the mounting torque, as a loose sensor cannot read knock correctly.
Does the same sensor really cover Can-Am, Polaris and Ski-Doo?
Yes - it is the reason this part carries cross references to both BRP and Polaris numbers. Check the number stamped on your original sensor against the cross reference table above before ordering, since several similar-looking sensors are used across these ranges.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
