Yamaha YBR125: Carburetor Specs, History & Rebuild Guide

Overview

The Yamaha YBR125 is a 124cc single-cylinder motorcycle produced by Yamaha (from 2005).

The Yamaha YBR 125 is a light motorcycle made by Yamaha that succeeds its previous model for this segment, the Yamaha SR125. Introduced in 2005, it comes in naked, faired and 'custom' variants. It has a single-cylinder, air-cooled, four-stroke engine, displacing 124 cc (7.6 cu in).

Engine & Carburetor

The Yamaha YBR125 uses a 124cc single-cylinder engine. The stock carburetor is a Mikuni BS26 unit. The BS26 is known for reliable fuel metering and is widely supported by aftermarket rebuild kits.

CarbForge offers carburetor rebuild kits compatible with the Yamaha YBR125. These kits include all necessary gaskets, jets, needle valves, and float assemblies to restore the original Mikuni BS26 carburetor to factory performance without purchasing a complete replacement unit.

Compatibility & Fitment

CarbForge carburetor repair kits are compatible with the Yamaha YBR125 (from 2005). Coverage spans the main production run from 2005 to present. Always verify your model year and carburetor part number before ordering.

Carburetor Maintenance Tips

Regular carburetor maintenance keeps your motorcycle running efficiently:

1. Clean the jets — Remove and clean the main jet, pilot jet, and needle jet every 12,000 km or as needed.
2. Inspect the float — Check the float for fuel leakage; a waterlogged float causes rich running.
3. Replace the needle valve — A worn needle valve and seat causes fuel overflow and flooding.
4. Check the diaphragm (CV carburetors) — A cracked diaphragm causes poor throttle response.
5. Use a rebuild kit — When multiple seals and jets need replacement, a complete rebuild kit is more economical than sourcing parts individually.