How do you tell if an outboard motor is a short or long 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.

How do I know if my engine is long or short shaft?

What is outboard shaft length?

Shaft length:

The shaft length announced by the outboard manufacturer is the vertical distance between the inside of the clamp and the cavitation plate. (We will not argue about names here but the proper name for the cavitation plate is ant ventilation plate). Shaft lengths come in multiples of 5″ (127 mm).

How do you measure a boat motor?

First, find out the square footage of your boat by multiplying its length by the width of the transom. Then use our calculator and the table here, to find out your boat’s maximum horsepower. For example, a twelve-foot boat with a four-foot transom width translates into a maximum engine size of fifteen horsepower.

What happens if your outboard shaft is too long?

If you went too long it would still work but it may lack in performance. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. If you go too short your more than likely going to cavitate and loose power.

Can you use a short shaft outboard on a long transom?

For boat owners with a short-shaft outboard on a long-shaft transom, Vance Manufacturing has developed a solution for you. … They act in place of a small-engine shaft extension, mitigating the issues that arise when trying to mount to a transom designed for long-shaft engines.

What size motor do I need for a 20 foot boat?

Tips for selecting the right size hp for portable outboard motor for your boat.
Motor HP Boat length (feet) Boat length (metres)
5hp – 15hp 8′ – 14′ up to 4.2m
9hp – 20hp 11′ – 16′ up to 4.5m
20hp – 40hp 13′ – 18′ up to 5.0m
40hp – 75hp 14′ – 20′ up to 5.5m

What size motor do you need for a 16 foot aluminum boat?

60 horsepower
An aluminum boat that is 16 feet long needs to have a 60 horsepower motor. Once equipped, it can have a speed of 25 to 30 miles per hour.

What size motor do I need for a 14 foot boat?

Typical horsepower for a 14-foot jon boat would be between 15 HP and 20 HP although up to 25 HP is not uncommon either. 20 HP can comfortably give you a top speed of 20mph, potentially even stretching to 25mph depending on weather conditions and the weight on the boat.

What size motor do I need for a 20 foot fiberglass boat?

Center console boats from 20′-25′ can usually perform well with a single outboard from 200 to 300-hp, depending on load and top speed expectations. Over 25′-26′, twin engines are typically recommended.

Can I put a bigger outboard on my boat?

Boats built in the U.S. after 1972 have U.S.C.G. mandated max horsepower capacity information supplied by the manufacturer. In this world of bigger-is-better, I’ve often been asked, “Just how big an outboard can I put on my boat?” … Exceeding any capacities on the plate can result in safety fines by the Coast Guard.

How fast will a 2.5 HP outboard go?

It’s easy to handle and has convenient grab points for lifting. Yamaha F2. 5 Four-Stroke ($940; www.yamaha-motor.com) power: 2.5 hp weight: 38 pounds top speed: 5.4 mph noise at full throttle: 87 dB-A.

What is the fastest 25 hp outboard?

The MEGA is by far the fastest 25 out there, but there are very few available, and it’s gonna cost you about 4-5k to get one off of somebody. There’s a few Yamaha 3 cyl for sale right now for about 3k, and they’re a great motor.

Are 4 stroke boat motors better than 2 stroke?

The fuel efficiency of a 4-stroke motor can be 50% better than that of a 2-stroke motor with the same HP. As for environmental concerns, 4 stroke outboards produce far less harmful emissions, which can be as much as 90% cleaner than those from a similar sized 2-stroke motor.

How fast will a 50 hp outboard go?

Depending on the type of boat and its weight, 50 hp can power you along at between 15 and 47 miles per hour. 50 hp may not seem like much, but if you are in a low-weight racing boat, you may be surprised by how far it can get you.

How much does a 25 hp Honda outboard weight?

Dry Weight

70.5 kg/155 lbs.

Who makes the lightest outboard?

Mercury Marine is introducing a new 9.9hp TwoStroke outboard that is the lightest in its class – an ultralight, compact and portable engine which provides exceptional power.

What is the fastest hp outboard?

Based on a supercharged 4.6-litre four-stroke V8, the new model is unlike any other on the market. The Mercury 450R is the most powerful outboard engine produced in the world today. Seven Marine 627SV with power output over 600 hp does not count, as it can hardly be considered«civil».

How long do outboard engines last?

A typical estimate from the industry is that an outboards motor last around 1,500 hours of operation. Assuming the average owner uses their boat 200 hours a year, this would mean that the motor would last between seven and eight years.

Does Honda make a 25 hp outboard motor?

Packed with dependable power. For mid and smaller horsepower needs, there’s plenty of punch in the Honda BF30 and BF25. But it’s power you’ll feel and never hear.

What is the lightest 30 hp outboard?

DF30A
Description. It has long been a Suzuki hallmark to engineer lightweight outboards, so in keeping with that, the DF30A is the lightest outboard in the 30hp class.