Kyosho UM321C - 21T Steel Pinion for 1/48 Models  [KY-UM321C]

Kyosho UM321C - Steel Pinion Gear(21T)1/48
Price:
£0.00
Brand:
Kyosho
Model:
KY-UM321C
GTIN:
4548565271634
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Spares / Hop-ups - Kyosho - RB6.6 spare parts category
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Steel 21T Drive Pinion for 1/48 Models

This Kyosho UM321C steel pinion supplies 21 uniform teeth designed for 1/48 scale radio-controlled drivetrains. It acts as a direct replacement option that focuses on stable meshing and longer wear life than softer alternatives.

When installing, verify correct axial alignment on the motor shaft and set an even gear mesh, then secure the set screw without over-tightening. Conduct a slow test rotation and periodic inspections to ensure consistent drivetrain performance.

Specifications

  • Item: Steel Pinion Gear
  • Material: Steel
  • Model Number: UM321C
  • Compatibility: 1/48 scale RC models

Suitable as a replacement or upgrade for compact RC drivetrains calling for a steel 21T pinion, it balances robustness with predictable engagement characteristics.
Remark :
Due to limited stock availability, please notice that some Kyosho 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 UM321C fits my vehicle?

Compare the UM321C part number and physical dimensions with your existing pinion. Also ensure the tooth pitch and bore match your spur and motor shaft to guarantee a correct fit.

Why does the drivetrain make noise after fitting a new pinion?

Noise usually indicates incorrect mesh or alignment. Recheck the axial position, tooth contact pattern, and that the set screw is secure but not overtightened. Adjust until contact is even.

Is UM321C a direct replacement for older part numbers?

Some listings place UM321C alongside earlier UM321 references. To be certain of interchangeability, match the model number and measure the pinion dimensions against your original part.

What checks help if the drivetrain binds after installation?

If binding occurs, inspect the gear mesh for tight contact, check motor shaft alignment and bearings, and ensure the pinion is mounted concentric to the motor shaft. Correcting these items typically removes binding.

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