How to Measure an Outboard Motor Shaft Length

Choosing the wrong shaft length can lead to all sorts of headaches, from poor performance to potential damage to your boat or motor. But don't worry, we're here to help! In this guide, we'll walk you through the simple steps of measuring your outboard motor shaft length, ensuring you get the perfect fit for your vessel and enjoy smooth sailing.

Why Shaft Length Matters

Before we dive into the "how-to," let's quickly understand why getting the right shaft length is so important. Here's the lowdown:

• Performance: If your shaft is too short, your propeller won't be submerged deep enough in the water, leading to poor performance, reduced speed, and potential cavitation.
• Safety: A shaft that's too long can drag in the water, creating excessive resistance and potentially damaging your motor or even causing your boat to become unstable.
• Handling: The correct shaft length ensures proper water flow to the propeller, improving handling and maneuverability.

Measuring Your Outboard Shaft Length

Alright, let's get down to business! Here's how to measure your outboard motor shaft length like a pro:

• Gather Your Tools: You only need a few simple tools for this task: 

1. 1. Tape measure: A standard tape measure will do the trick. 
   2. Pencil or marker: To mark your measurements. 
   3. A friend (optional): An extra set of hands can be helpful, but it's definitely doable solo. 

• Locate the Transom: The transom is the flat, vertical surface at the back of your boat where the outboard motor is mounted. 
• Measure from the Top: Place the end of your tape measure at the very top of the transom, where it meets the boat's hull. 
• Measure to the Bottom: Extend the tape measure down to the bottom of the keel (the lowest point of the boat's hull). 
• Record the Measurement: This is your transom height, and it will determine the appropriate outboard shaft length. 

Choosing the Right Shaft Length

Now that you have your transom height, here's a general guideline for choosing the right shaft length:

• Short Shaft: 15 – 17.5 inches
• Long Shaft: 19 – 22.5 inches
• Extra Long Shaft: 24 – 28 inches

Important Note: These are general guidelines. Always consult your outboard motor's owner's manual or the boat manufacturer's recommendations for the most accurate shaft length for your specific setup.

Measuring your outboard motor shaft length is a quick and easy process that can save you a lot of trouble down the road. You'll enjoy optimal performance, improved handling, and peace of mind on the water by ensuring you have the correct shaft length. So, grab your tape measure, follow these simple steps, and get ready to make some waves!

If you're ever in need of a new outboard motor or have any questions about shaft length or other boating essentials, the experts at OnlineOutboards.com are always here to help. Reach out today.