<![CDATA[The high rate of defective products (Not Good) in the motorcycle parts painting process at PT Z is a critical issue affecting production efficiency and customer satisfaction. This study aims to Analyze the root causes of defects and propose quality Improvement strategies using the Six Sigma method with the DMAIC approach (Define, Measure, Analyze, Improve, Control). Based on production data from January 2024 to February 2025, the most frequent defect type was "minor dirt" with a sigma value of 2.97 and DPMO of 70,695. Using Fishbone and Pareto Chart analysis, the main causes were identified as dust contamination during painting, unstable paint pump pressure, and suboptimal spraygun settings. The proposed Improvements include operator training, preventive maintenance, raw material inspection, development of work instructions (WI), and workplace cleanliness Controls. The results demonstrate that the Six Sigma approach is effective in reducing defect rates and enhancing quality Control sustainably. Keywords: Defective Products, DMAIC, Motorcycle Parts Painting, Quality Control, Six Sigma]]>
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