YZ-4 Rear Belt Narrowing Accessory Compatible with YZ-4 - Z4-309C by Yokomo  [Z4-309C]

Yokomo Z4-309C Aluminum Narrow Pulley & Belt set for YZ-4
Price:
£15.09
Brand:
Yokomo
Model:
Z4-309C
GTIN:
3888
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Compact Aluminium Rear Belt Narrowing for YZ-4

The Yokomo Z4-309C narrows the rear belt path on YZ-4 4WD off-road cars to reduce friction and lighten the drivetrain load. The aluminium construction focuses on reducing mechanical loss in lower-powered configurations rather than increasing raw output.

Fitting work is concentrated on the rear belt assembly: the pulley and belt parts replace the OEM rear routing components so the belt follows a narrower span. Routine RC mechanical skills are sufficient; the job typically involves removing the original rear-belt parts and reinstalling the new pulley and belt with precise alignment and correct tension to prevent binding.

Compatibility note: by trimming belt friction the kit can lower drivetrain power consumption under load, which helps in stock-class or regulated-power categories. Consider it a fine-tuning component for smoother belt-drive operation rather than a power upgrade.

Specifications

  • Item Aluminum Narrow Pulley & Belt set
  • Material Aluminum
  • Model Number Z4-309C
  • Compatibility YZ-4, B-YZ4

Compatibility

  • YZ-4
  • B-YZ4

The Z4-309C is suited for reducing rear belt drag on YZ-4 platforms; always verify belt tracking and tension after installation to secure the expected efficiency benefits.
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

Will this fit on modified YZ-4 chassis with aftermarket parts?

It is designed for YZ-4 and B-YZ4 geometry. If your rear-belt routing has been altered by other aftermarket components, confirm clearances before fitting to ensure correct belt path and pulley clearance.

Can the kit be used on higher power setups?

The kit reduces friction but is not intended to add torque capacity. For higher power builds, check belt and pulley load ratings and monitor temperatures closely during initial use.

Does installation affect warranty or OEM parts?

This is an aftermarket accessory for YZ-4 platforms. Check your vehicle's warranty terms regarding third-party parts before installation if warranty preservation is a concern.

How do I verify correct installation once fitted?

Run the model at low speed and inspect for unusual noise, rubbing, or belt mis-tracking. Re-check belt tension and alignment after a short break-in run to confirm correct operation.

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