Increasingly intense competition among companies in the industrial motor manufacturerÂ of motorcycles in Indonesia has caused the decline in the level of customer and productÂ purchases, and the profitability of most companies motorcycle manufacturer in Indonesia.Â It is also experienced by PT Astra Honda Motor in its motorcycle product as a marketÂ leader in the motorcycle industry. To re-gain more new customers while maintaining oldÂ customers, and obtain the level of purchases of Honda motorcycles and high profitabilityÂ in the company, the need for efforts to improve the customer buying decision, becauseÂ the purchase decision is a major factor in increasing sales and profitability. In this study,Â we use differentiation, promotion, and positioning as an independent variable to beÂ studied how they affect purchasing decisions. The results showed that the coefficient ofÂ determination shown in the Adjusted R Square of 0.704, which means that its influenceÂ purchasing decisions can be explained by the three independent variables in this researchÂ that differentiation, promotion, and positioning of 70.4%, and the remaining 29.6% canbe explained by other variables outside the model of this research. Partially based on theÂ results of t test variables in this study has positive and significant in which promotion hasÂ the biggest influence on purchase decisions , while positioning has the smallest influenceÂ on purchase decisions.