Yamaha Lower Unit Assembly - 6M8-G5300-11-4DYamaha Lower Unit Assembly Gearcase Component 6M8 G5300 11 4D Overview The lower unit is where all that engine power finally turns into movement, so when its off, you feel it immediately. Ive seen setups lose smoothness, get noisy, or just not push right because the gearcase was worn out. Bolt on a solid assembly like this, and everything tightens back upclean shifting, steady power, and a smoother ride. Its one of those upgrades that brings
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