Primary Chain Kit 420 for Sur-Ron Light Bee L1E & X – 13T/30T Belt Delete

The Primary Chain Kit 420 is a primary drive conversion kit built for the Sur-Ron Light Bee electric motorcycle. It fits both the Light Bee L1E and the Light Bee X. The kit replaces the factory toothed belt and pulleys with a #420 motorcycle chain and two hardened steel sprockets.

Inside the box you get a 13-tooth motor sprocket and a 30-tooth reduction shaft sprocket. This 13T/30T pairing mirrors the factory gear ratio exactly. As a result, your transmission geometry stays completely standard. This is a durability upgrade, not a gearing change.

The conversion targets the first drive stage only – the run between the motor and the reduction (intermediate) shaft. That stage leaves the factory running on a belt. Riders in sand, mud and hard off-road conditions wear that belt out fastest. A chain simply handles those conditions better.

Key Benefits

• Stronger than a belt – the chain resists sand, mud, impacts and high torque loads that shred rubber.
• More efficient power transfer – smaller contact area and a lower friction coefficient than the original belt.
• Easier servicing – you can swap the chain quickly, because the swingarm stays on the bike.
• OEM gear ratio kept – the 13T/30T combination preserves standard transmission geometry.
• Hardened steel sprockets – both sprockets are machined from hardened steel.
• High-tensile #420 chain – a genuine motorcycle chain, not a bicycle chain.
• Bolt-on fitment – no frame modifications and no motor machining required.
• Pre-matched chain length – supplied to suit the OEM ratio, so no calculating or shortening.

Who Is This Kit For?

This kit suits owners of the Sur-Ron Light Bee L1E and the Sur-Ron Light Bee X. It changes the primary drive only – the stage that leaves the factory with a toothed belt and pulleys. The final drive from the reduction shaft to the rear wheel stays untouched.

Above all, it is aimed at riders who spend time in sand and mud. Those particles destroy belts faster than anything else. Furthermore, it makes sense if you run an upgraded controller or motor. More torque means more strain on that first stage, and a chain absorbs it far better.

Finally, the kit works well for everyday trail use where quick trailside servicing matters. You can adjust or replace the chain without a major teardown. Consequently, a broken belt no longer means the end of your ride.

What’s in the Box?

• 13-tooth hardened steel motor sprocket
• 30-tooth reduction (primary) shaft sprocket
• #420 standard chain, length matched to the OEM gear ratio

Technical Specifications

Why Choose the Primary Chain Kit 420?

The factory toothed belt is the weakest link in the Light Bee driveline once sand and mud enter the picture. Grit works its way between the belt and pulley teeth and grinds them down. A chain is far less sensitive to those particles. Therefore the primary drive becomes more resistant to shock loading and sustained torque.

Efficiency is the second reason. Because the chain has a smaller contact area than the belt, friction losses drop. Power travels from the motor to the reduction shaft with less waste along the way.

Servicing is the third argument, and it is a practical one. The Light Bee already uses a #420 chain for its final drive to the rear wheel. This kit brings the same standard to the primary stage. So you carry one type of lubricant and one set of tools for both chains.

Installation Tips

• Check sprocket alignment and chain tension after the first 20-50 km.
• Use a lubricant formulated for #420 chains.
• Avoid aggressive solvents, since they damage the seals.
• Confirm the chain guard clears the chain across the full suspension travel range.

Frequently Asked Questions

Does the Primary Chain Kit 420 change the final gear ratio on my Sur-Ron Light Bee?

• No. The 13T/30T combination matches the OEM gear ratio.
• The kit affects only the primary drive between the motor and reduction shaft.
• Your acceleration and top speed characteristics stay as they were.

Will this kit fit both the Light Bee L1E and the Light Bee X?

• Yes. Both Sur-Ron Light Bee L1E and Light Bee X versions are supported.
• Fitment is bolt-on for both models.

Do I need to modify the frame or motor to install it?

• No frame or motor modifications are required.
• The sprockets and chain mount using the existing hardware locations.

Do I have to remove the swingarm to change the chain?

• No. Chain replacement does not require swingarm removal.
• That makes trailside adjustment and servicing much quicker.

Do I need to cut the chain to length?

• No. The #420 chain arrives at a length matched to the OEM ratio.
• No separate calculation or shortening is needed.

Is this a good upgrade if I run a bigger controller or motor?

• Yes. Higher torque puts extra strain on the primary drive.
• The hardened steel sprockets and #420 chain handle that load better than a belt.

How do I maintain the primary chain?

• Lubricate it periodically with a product made for #420 chains.
• Check tension regularly, especially after riding in sand or mud.
• Keep aggressive solvents away from the chain seals.

Swapping the belt for a #420 chain turns the Sur-Ron Light Bee primary drive into a serviceable, grit-tolerant assembly. With hardened steel sprockets at 13T and 30T, the factory ratio stays intact while the weakest driveline link disappears. Both L1E and X riders get the same bolt-on solution.