Support Spring 420427311 by Can-Am

Genuine Can-Am Support Spring — OEM Part #420427311

Get crisp engagement and smooth acceleration back with a genuine Can-Am Support Spring. Built for the Defender HD11 or Traxter HD11, it matches the original CVT specification, so belt alignment, shift points and cooling airflow stay where they should.

The drive and driven clutches, belt, covers and cooling ducts work as one system. Worn or mismatched parts cause belt slip, harsh engagement, overheating and early belt failure. This part is confirmed for 14 Can-Am models from 2026. See the full fitment list below.

Support Spring at a Glance

• OEM part number: 420427311
• Brand: Can-Am by BRP (genuine factory part)
• Part type: CVT/Clutch Components
• Fits: Defender utility side-by-side and Traxter utility side-by-side models, 2026
• Condition: New

Can-Am Models and Years This Support Spring Fits

Genuine Can-Am part #420427311 fits the models and years below. To be certain, match the part number to the factory parts diagram for your machine or contact us with your VIN before ordering.

Can-Am Defender utility side-by-side Fitment

Can-Am Traxter utility side-by-side Fitment

Why Choose a Genuine Can-Am OEM Support Spring?

• Factory calibration for engagement, shift-out and backshift
• Correct belt alignment and deflection
• Keeps CVT cooling and sealing at factory standard
• Helps your drive belt last longer
• Sold by Witchdoctors, with factory part numbers and parts diagrams for every Can-Am model we support

Features and Materials

Key Features

• Genuine Can-Am OEM CVT part, part #420427311
• Built to BRP's original clutch specifications
• Precision-machined surfaces where applicable
• Designed for the listed Can-Am CVT systems
• Works with OEM belts, covers, seals and ducts

Materials and Construction

Can-Am CVT parts use precision-machined aluminum sheaves and housings, hardened steel shafts and rollers, wear-resistant bushings, and heat-stable plastic or composite covers and ducts sealed against water and dust.

Common Reasons Riders Replace This Part

• Fixing belt slip, jerky engagement or poor top speed
• Replacing worn sheaves, rollers, springs or bushings
• Repairing covers, seals and ducts after water intrusion
• Routine CVT service and belt replacement

Signs Your Support Spring Needs Replacing

• Belt slipping, squealing or a burning smell
• Jerky, harsh or delayed engagement
• Loss of top speed or acceleration
• Glazed belt or frequent belt failures
• Water or debris inside the CVT cover

Installation Tips

1. Remove the CVT cover and clean out belt dust before taking anything apart.
2. Use the correct BRP clutch tools; clutches are under spring tension.
3. Inspect sheave faces, rollers, bushings and the belt while you are in there.
4. Assemble to factory torque specs and check belt deflection and alignment.
5. Replace cover seals and follow the belt break-in procedure.

Not sure whether to tackle it yourself? Read when to seek professional help or DIY before you start.

Can-Am Parts Diagrams for Your Machine

Find part #420427311 and every part installed with it in the factory Can-Am parts diagrams for your model:

• 2026 Can-Am Defender HD11 LTD Cab parts diagrams
• 2026 Can-Am Defender HD11 X mr parts diagrams
• 2026 Can-Am Defender HD11 XT parts diagrams
• 2026 Can-Am Defender HD11 XT Cab parts diagrams

Related OEM Parts for the Same Machines

Doing the job right? These genuine Can-Am parts fit the same models and are often replaced at the same time:

• Can-Am CVT Filter (#706600423)
• Can-Am Drive Belt (#422280652)
• Can-Am Adapter (#706600474)
• Can-Am Adapter (#706600450)
• Can-Am Adapter (#706600476)
• Can-Am Adapter (#706600438)

Recommended Accessories and Maintenance Supplies

Pair your Support Spring with these parts and supplies:

• UTV drive belts — OEM and heavy-duty CVT belts
• UTV clutches — Clutch kits and components
• Clutch tools — Tools for CVT service
• Belt cases — Spare belt carriers for the trail
• Can-Am OEM parts diagrams — find every factory part for your model

Helpful Guides from the Witchdoctors Blog

• OEM vs Aftermarket UTV/ATV CVT Clutch Components
• UTV / ATV Drive Belt Comparison: OEM vs. Heavy-Duty Aftermarket Belts
• How to Inspect Your UTV/ATV Drive Belt for Wear & Damage
• Can-Am OEM vs. Aftermarket Parts: Which Is Better?

Frequently Asked Questions

What is the OEM part number for this Can-Am Support Spring?

The genuine Can-Am part number is 420427311. Use it to match this part to your factory parts diagram.

Which Can-Am models does part #420427311 fit?

It fits 14 Can-Am Defender and Traxter models from 2026 to 2026. The complete list is in the fitment tables above.

Is this a genuine Can-Am part?

Yes. This is a genuine Can-Am OEM part from BRP, the same part number used at the factory, not an aftermarket copy.

Should I replace the belt at the same time?

If the belt is glazed, cracked or worn to minimum width, replace it with the clutch parts.

What causes CVT belts to burn up?

Riding in high range at low speed, heavy loads, water in the CVT and worn clutch parts. Use low range for slow, heavy work.

Do I need special tools?

Yes. Most Can-Am clutches need specific holding and puller tools to service safely.

Order Your Genuine Can-Am Support Spring Today

Ride with confidence on parts built for your machine. Order the genuine Can-Am Support Spring, OEM part #420427311, from Witchdoctors today and keep your Defender HD11 or Traxter HD11 running the way BRP designed it.

• How long will it take to receive my order?
• Shipping and return policy
• Questions about fitment? Contact us
• Shop all Can-Am OEM parts

Where to Ride Your Can-Am

Ready to put your machine to work? These off-road parks welcome both ATVs and UTVs. Check each park's current rules, vehicle-width limits and permit requirements before you go.

• Georgia Offroad Adventures — Union Point, Georgia: about 150 miles of signed trails
• Sand Mountain Recreation Area — Fallon, Nevada: about 4,800 acres of dunes