MTX 436 Hornet Lightweight Steel Front Sprocket #520 size:13 Tooth so it works on almost

so it works on almost anything with a wheel

FMF-041612

Frame Plug rear LHS and RHS

this kit includes the below for your YAMAHA WR250F 15-19 / YZ250F 15-19:

YZ400F Econ 436

MTX 436 Hornet Lightweight Steel Front Sprocket #520 size:13 Tooth so it works on almostMTX Hornet front sprockets are a lightweight performance alternative to OEM sprockets. Featuring self cleaning mud grooves between the teeth for extended chain and sprocket life, with lightening holes to reduce rotational mass the Hornet series is designed for champions. CNC machined from case hardened Chromoly steel and fully heat treated for maximum strength and durability. Fully heat treated for maximum strength and durability Lightening holes