Seller notes

This 125cc Semi-Auto Engine has reverse gear suitable for ATV UTV 4 Wheelers Speed complete racing engine, 3 forward 1 reverse gear Upgrade your stock 50cc to this 125cc monster, you can feel the power difference immediately See below description for more specifications and wiring Specifications: Displacement: 125cc Type: Horizontal, single-cylinder, 4-stroke, air-cooled Compression ratio: 9.0: 1 Front sprocket 420 - 17mm - 14T Transmission: 4-speed 3 forward 1 reverse gear Bore x Stroke: 2.06" ...

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