How do i know if my boat motor is long or short shaft?

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Eden Kuvalis asked a question: How do i know if my boat motor is long or short shaft?
Asked By: Eden Kuvalis
Date created: Wed, Feb 17, 2021 10:20 PM
Date updated: Tue, Jun 28, 2022 8:38 PM

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Top best answers to the question «How do i know if my boat motor is long or short shaft»

Measure from the top of your transom to the bottom of your keel. If it is from 15" to 17" long you'll need to get a Tohatsu outboard with a "short" shaft. If it is from 20" to 22" long you'll need our "long" shaft outboard.

FAQ

Those who are looking for an answer to the question «How do i know if my boat motor is long or short shaft?» often ask the following questions:

⚓ Does my boat need a short shaft or long shaft motor?

If your boat has a Transom Height 15"-16" you will need short shaft and if it is 20"-21" you will require long shaft engine. Small inflatables and dinghies tend to require 'short shaft' engines whilst larger boats usually require long or in some cases special ultra long shaft versions.

⚓ How do i know if my boat motor is too low?

You can often tell that an outboard is too low if you are experiencing sluggish speeds, poor handling, excessive spray, porpoising, or even water pushing up into the cowling. That's a very brief, basic accounting of symptoms, but you'll usually find at least one of these symptoms if your motor is too low.

⚓ How do i know if my boat shaft is bent?

Check the shaft too. “If the tip of a propeller blade is bent over, there is a good chance the shaft is bent,” Fay says. Place a dial indicator at the taper and rotate the shaft, looking for no more than two-thousandths of wobble. Check long shafts in the middle too for no more than five-thousandths variance.

⚓ How do i know what size motor my boat has?

  • On the left side of the plate, about half-way down the plate, you will find the model of your boat. Remember, while the NMMA plate tells you the maximum horsepower rating--the largest motor--your boat's hull was designed to work with, the plate doesn't give you any information about the motor itself.

⚓ How do you know if your boat motor is flooded?

When you turn your outboard motor's ignition key and it won't start, then smell that stink of excess gas that indicates your outboard's flooded, your heart might sink a bit, as if abandoned at a party by a friend who's borrowed your car.

⚓ How do you tell if your boat needs a short or long shaft?

If your boat has a Transom Height 15"-16" you will need short shaft and if it is 20"-21" you will require long shaft engine. Small inflatables and dinghies tend to require 'short shaft' engines whilst larger boats usually require long or in some cases special ultra long shaft versions.

⚓ How do you troubleshoot a boat motor?

  1. Check the Tank Vent and Hoses…
  2. Check the Fuel Connector…
  3. Check the Fuel Filter/Water Separator…
  4. Check/Replace Secondary Fuel Filters…
  5. Check/Replace Air Filter…
  6. Check Spark Plugs/Ignition…
  7. Check/Clean Carburetor.

⚓ How fast is a 2.5 boat motor?

Here are our results. Tohatsu 2.5 Two-Stroke ($630; www.tohatsu.com) power: 2.5 hp weight: 26 pounds top speed: 5.4 mph noise at full throttle: 84 dB-A. The Tohatsu 2.5 was the only two-stroke we tested. As expected, it's the lightest and least expensive.

⚓ How long can a boat motor sit without running?

One of the most commonly-asked questions we get is, “Is it okay if my boat isn't running for a while in Fort Lauderdale, FL?” The answer is yes—but you have to do some maintenance beforehand. As long as it's well maintained before going into storage, a boat can sit for a few months, a few years or even a few decades.

9 other answers

Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. Small portable outboards ranging from 2 to 20 horsepower are usually sold only in short or long shaft versions. High powered boats usually only come in long and extra-long variants.

The correct length for the outboard engine drive shaft is determined by the height of your boat's transom, as measured from top to bottom in the centre. This distance is generally referred to as the “Transom Height” If your boat has a Transom Height 15"-16" you will need short shaft and if it is 20"-21" you will require long shaft engine.

Choosing a Short, Long, or Extra Long Shaft Outboard Motors You must measure your transom in order to determine what shaft length motor you need. Keep in mind that the cavitation plate should be flush with the bottom of the boat. You can get away with an inch or two either way but it is wise to keep it close.

Long Shaft: 20’’ X-Long Shaft: 25’’ XX-Long Shaft: 30’’ In practice, you may find the outboard motor shaft length varies among different brands and manufacturers like the Honda,Suzuki, Yamaha, Torqeedo, etc. Say the 20’’ shaft is a long shaft length for gas engines, but it is a short shaft length for electric outboard motors.

Measure from the bottom of your outboard's engine compartment down to the bottom of the cavitation plate -- the horizontal metal wing above the propeller. If the measurement lies between 19 and 21 inches, it's a short shaft. If it's about five inches longer than that, it's a long shaft.

You don't need to shove the motor in up to its power head. My kicker has a fixed bracket to my swim platform, I have substituted my 20" shaft with a 15" and as long as the waves are 3ft. or less I can get away with it, but I will say with the 20" shaft same hp. the longer shaft just works better, the water and bubbles are much closer to the boat and requires more throttle to get the same results of the 20"shaft where the water boils up a lot further back than the shorter shaft.

Re: what kind of motor, long or short shaft for my boat That same website shows how/where to measure the outboard. In short, from the underside of the transom mount (i.e. where the mount will contact the transom at the uppermost part) to the top of the cavitation plate is where you measure from.

To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. If it measures 15" or with in a inch of that you will need a short shaft outboard. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor.

HI jonboatbassin

The motors short 15" og long 20" shaft is designed to each their transom height. Mesure your boat from the over edge of the transom where the motorbracket rests and to the buttom of the keel at transom.

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