Outboard Motor Shaft Length: How to Measure Accurately

Choosing the right outboard motor for your boat is crucial, and one of the most important factors to consider is the outboard motor shaft length. A properly sized shaft ensures your motor is installed at the correct height, allowing for optimal performance and preventing damage to your boat or motor. This guide will walk you through the steps of accurately measuring your outboard motor shaft length.

Understanding Shaft Length

Outboard motor shaft lengths are typically measured in inches. Common shaft lengths include:

  • 15 inches: Suitable for smaller boats and shallow waters.
  • 20 inches: A versatile length for various boat sizes.
  • 25 inches: Ideal for larger boats and deeper waters.

How to Measure Outboard Motor Shaft Length

  1. Prepare your boat: Make sure your boat is sitting level on the trailer or in the water.
  2. Locate the transom: The transom is the rear vertical section of your boat, where the motor is mounted.
  3. Measure from the top of the transom: Use a measuring tape and measure straight down from the top of the transom to the bottom of the boat’s hull.
  4. Add the desired height: Add the desired height of the motor mounting bracket to the measurement from step 3. This height is typically indicated by the motor manufacturer.
  5. Check your manual: Refer to your boat’s manual to determine the recommended shaft length for your specific boat model.

Tips for Measuring

  • Use a level: Ensure that the transom is level to get an accurate measurement.
  • Consider the boat’s weight: The weight of your boat can influence the required shaft length.
  • Consult a professional: If you are unsure about the correct measurement, consult a qualified marine mechanic.

Conclusion

Measuring the outboard motor shaft length correctly is essential for a successful and safe boating experience. By following these simple steps, you can ensure you select the right motor for your boat and avoid any potential problems down the line. Remember to always prioritize safety and consult professionals when in doubt.

Article By Fr4nk