Koso O2 Sensor Bung Kit | 18mm x 1.5 Weld-In | Honda Grom, Monkey, Z125, KLX110, CRF110 & More

Add O2 sensor capability to any custom or aftermarket exhaust with the Koso North America O2 Sensor Bung Kit. This universal 18mm x 1.5p weld-in bung kit is the essential hardware for tuners running wideband O2 sensors, fuel controllers, or air/fuel ratio gauges on mini bikes and small-displacement motorcycles.

What's Included

• 18mm x 1.5p weld-in O2 sensor bung — compatible with any standard O2 sensor port
• 18mm x 1.5p aluminum bung plug with washer — seals the port when the O2 sensor is not in use

Key Features

• Universal fitment — works with any exhaust system that accepts an 18mm x 1.5p O2 sensor
• Weld-in design for a permanent, leak-free installation
• Aluminum plug included to cap the bung when running without an O2 sensor
• Essential for tuning builds using Power Commander, Bazzaz, Koso gauges, or wideband controllers
• Compact and lightweight — minimal impact on exhaust weight

Fitment

• Honda Grom 125 (All Generations: OG, SF, JC92)
• Honda Monkey 125 (2019–2021 & 2022+)
• Honda CRF110 (2019+)
• Kawasaki Z125 Pro
• Kawasaki KLX110
• Benelli TNT 135
• Universal — any exhaust with 18mm x 1.5p O2 sensor port

Specifications

• Brand: Koso North America
• Thread Size: 18mm x 1.5p
• SKU: BG001813
• Barcode: 01258481
• Weight: 0.11 lbs
• Product Type: Exhaust / O2 Sensor Hardware

In stock and ready to ship. An affordable must-have for any performance tuning build.