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On average, a basic outboard motor tune up should be between $80 and $650. Generally, the larger the motor and the more horsepower it has, the more you are going to have to pay. Smaller 2, 3 and 4 cylinder tune ups are often around $65 to $150, while a 15HP motor can cost upwards of $200. 6 and 8 cylinders can cost $200 to $400.
Shopping for a tune-up: 1  Running diagnostic tests on highly computerized car systems is typically beyond the skill level of most home mechanics, but many can handle the other steps in a basic engine tune-up. 2  Materials typically cost $25-$100, depending on whether it's necessary to buy specialized tools. Materials typically cost $25-$100, depending on whether it's necessary to buy specialized tools. 2  CostHelper readers report spending $25-$70 or an average of $56 on a do-it-yourself tune-up.