Chain Kit

Zero offers some chain kit options that include front and rear sprockets and a 520 DID X-ring chain.

Enhanced Chain Kit for FX/FXS models across all 2013+ years.
For 2017 models, a chain conversion kit is referenced as part 10-08127 (unconfirmed).

Motorcycle chain drives are common, so generic maintenance can be quite effective:
- Love Your Chain: Top Maintenance Tips by Bennetts
- How to Clean and Lube A Motorcycle Chain by Revzilla
There's some vague agreement that for chain slack, 0.8-1.2in of deflection is appropriate.
Chains tend to loosen as they wear, so a little tighter at the start is somewhat helpful.

Zero's swingarm pivot is concentric/aligned with the motor shaft and countersprocket, so there's no need to check for tension changes as the swingarm squats.
Zero's kit chain does not have O-rings, and many prefer a chain with O-rings for longer lifespan and quieter and smoother operation, so changing the chain is recommendable.

Overview: This replaces the Drive Belt with a chain.; This installs a chain guide on the underside of the swingarm.; This replaces the pulley sprockets with toothed sprockets.

Center lift.
27mm socket for the rear axle nut.
3mm Allen key.
10mm Allen key socket
Ensure at least 1" depth and a ⅜" drive sufficient to handle swingarm pivot bolt torques.
15mm socket wrench (S models).
13mm socket wrench (X models).
Torque wrench capable of setting 75ft-lbs and driving the 27mm socket and 10mm Allen key.
2012-2013:
- 2.5mm Allen key.
- 24mm socket wrench.
(2013-2017?) 6mm Allen key and wrench to remove the rear sprocket pulley from the rear wheel.
(2018?) T45 Torx bit and wrench to remove the rear sprocket pulley from the rear wheel.

For any chain fitment, wait until running the chain over the sprockets (and probably through the guide) before unlinking the chain and fitting a master link for its final length.
Any mistakes in length estimation require more chain tool use which is just adding risk.

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