YZ-4 Rear Belt Narrowing Kit for YZ-4 - Z4-309C by Yokomo  [Z4-309C]

Yokomo Z4-309C Aluminum Narrow Pulley & Belt set for YZ-4
Price:
AUD$28.48
Brand:
Yokomo
Model:
Z4-309C
GTIN:
3888
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Rear Belt Narrowing Upgrade for YZ-4

The Yokomo Z4-309C kit reduces the rear belt span on YZ-4 4WD off-road cars to lower friction and lessen rotational load. The aluminium build is intended to preserve drivetrain efficiency on setups with limited power rather than boost torque.

Installation is concentrated on the rear belt area: the kit's pulley and belt parts replace the original rear-belt routing components to create a narrower path. Installers with basic RC mechanical skills should be able to complete the swap, taking care with belt routing, alignment, and tension to avoid binding or mis-tracking.

Tuning impact: trimming friction in the belt run reduces power loss under load, which may improve throttle response and reduce motor strain in regulated classes. Consider this as a refinement to drivetrain behavior rather than a performance-adding mod.

Specifications

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

Compatibility

  • YZ-4
  • B-YZ4

Use the Z4-309C to fine-tune belt drive efficiency on YZ-4 platforms, and always confirm belt tension and alignment after fitting to avoid issues.
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.

How should I set belt tension after fitting the kit?

Set tension so the belt runs true without sag but not so tight that it creates extra bearing load. Small test runs and listening for whine or binding will help dial the correct tension.

Does narrowing the belt affect handling?

Indirectly. Reduced driveline drag can improve throttle response and reduce drivetrain heating, but vehicle handling changes will be minimal and depend on the whole setup.

Are there recommended belts or pulleys to use?

Use the belt supplied with the kit or equivalent replacements matched to the pulleys. Maintain correct tooth profile and width for reliable operation.

Should I expect reduced motor temperature?

Lower drivetrain losses can reduce motor load slightly, which may show as modest temperature reduction depending on motor, gearing, and duty cycle.

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