Motorcycle 520 Rear Sprocket Gear For Kawasaki KLX400 KLX400SR Off-Road Transmission Parts Fit For Kawasaki KLX400 KLX400SR offroad motorcycles matched for standard 520 size drive chain punched mounting holes align rear hub bolt layout enables direct bolt on installation without Optimized tooth profile fits 520 chain links tightly reduces chain skip running vibration during trail riding Constructed from carbon with full treatment hardened gear teeth slow abrasion under heavy offroad loads Calibrated OEM dimension uniform plate thickness maintains balanced rotation for stable power transfer