Honda UMK431 / UMK431K1 OEM String Trimmer Brush Cutter Gearbox

Restore cutting performance and reliability with this genuine OEM Honda gearbox assembly, designed for UMK431 and UMK431K1 trimmers and brush cutters (all types). This complete unit comes fully assembled and ready to install, making it an ideal replacement for worn, noisy, or damaged gearboxes.

Honda part number 41100-VL1-023 replaces 41100-VL1-013 and 41100-VK4-M01, ensuring updated fitment and dependable operation.

Please note: This gearbox is set up for a string trimmer head. If you are running a brush cutter blade, you will need to reuse your existing bottom cup, spacer, and blade mounting nut.

This is a special order item and typically ships within approximately 5 business days after purchase.

If you are not completely certain of your exact model, contact us with your full serial number and we’ll gladly verify compatibility before you order.

Features:

• Genuine OEM Honda gearbox assembly
• Honda part number: 41100-VL1-023
• Replaces part numbers: 41100-VL1-013, 41100-VK4-M01
• Fully assembled for easy, bolt-on installation
• Restores smooth, efficient power transfer to cutting head
• Ideal replacement for worn, noisy, or damaged gearboxes
• Built to Honda factory specifications for durability and reliability

Important Notes:

• Configured for string trimmer head use
• For brush cutter blade applications, reuse:
  • Bottom cup
  • Spacer
  • Blade mounting nut

Fits the Following Models:

• Honda UMK431 (all types)
• Honda UMK431K1 (all types)

Note:
Model and serial number verification is recommended prior to purchase to ensure proper fitment.