YZ-4 Rear Timing Belt 103T 8mm - Z4-309-8 by Yokomo  [Z4-309-8]

Yokomo Z4-309-8 8mm Width Rear Belt 103T for YZ-4
Price:
CAD$9.84
Brand:
Yokomo
Model:
Z4-309-8
GTIN:
3888
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Replacement rear belt for YZ-4

This Z4-309-8 rear belt is a standard replacement made for the Yokomo YZ-4 4WD off-road car. The belt measures 309mm overall, features a 103T tooth count and an 8mm nominal width, matching the original rear drivetrain routing for this model.

Use the Z4-309-8 when restoring factory drivetrain geometry or swapping out a worn timing belt. Before fitting, inspect pulley grooves and related drive components for wear, route the belt on all pulleys following the original path, and set tension to remove slack without over-tightening so bearings are not overloaded.

For setup and tuning, a correctly matched 103T, 8mm belt preserves consistent engagement between spur and pinion paths and maintains reliable torque transfer across the 4WD layout.

Compatibility

Compatible with B-YZ4 chassis and the YZ-4 4WD off-road car platform.
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 can I confirm this belt will fit my YZ-4?

This Z4-309-8 is sized to match the original rear belt length and tooth count used on the YZ-4 and is compatible with the B-YZ4 chassis without modification.

What do 103T and 8mm mean for fitment?

103T indicates the number of belt teeth required for correct engagement with the stock pulleys; 8mm is the belt width that preserves the original drivetrain spacing and pulley alignment.

Any installation tips to avoid problems?

Check all pulleys for wear before fitting, follow the factory routing, tension to remove slack only, and recheck after a short run to ensure there is no fraying or tooth slip.

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