YC Yier TD204 125cc Semi-Automatic Engine Motor Kit with Wiring Harness

YC Yier TD204 engine motor kit with a horizontal, single-cylinder, air-cooled 4-stroke engine. The listing identifies the engine as 125cc, while the specifications state 120 ml displacement. It features a semi-automatic centrifugal friction clutch, four forward gears plus neutral, CDI ignition, and electric or kick starting. The kit includes a kick starter lever, gear shift lever, manifold set, PZ22 carburetor, air filter, 428 chain, 41-tooth 428 sprocket, exhaust pipe, wiring harness, throttle cable, and grips. The source lists compatibility with several mini trail, pit bike, dirt bike, and motorcycle models; verify mounting and fitment before purchase.