# Can I put a bigger motor on my boat?

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Can I use a bigger motor on my boat than what it’s rated for? It is not a violation of Coast Guard regulations to install or use an engine larger than specified on the capacity label, but there may be state regulations prohibiting it, and restrictions from your own insurance company regarding this.

## Can you exceed max HP on a boat?

The maximum horsepower capacity marked on a boat must not exceed the horsepower capacity determined by the computation method discussed in paragraph (a) of this section, or for certain qualifying boats, the performance test method discussed in paragraph (b) of this section.

## Whats the biggest motor I can put on my boat?

The rule of thumb guidelines based on weight alone would be between 40 and 25 pounds of weight per 1 hp. In other words a 5,000 lb boat fully loaded could have a 125 to 200 hp engine. The wide range, based on weight alone, is due to the variety in design and handling characteristics of a given boat.

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## How big of a motor can you put on a 14ft boat?

12 foot – 10 – 15 hp motor. 14 foot -15 hp motor. 16 foot – 15 – 20 hp motor. 18 foot – 18 – 20 hp motor.

## What happens if you overpower a boat?

Either overloading or overpowering your boat is extremely dangerous. Putting an over-sized engine on your boat will cause your boat to sit too low in the stern, and that will make it much more susceptible to being swamped by its own wake or that of a passing boat. An overpowered boat is also hard to control.

## Why do boats have a max hp rating?

It seems obvious that the maximum horsepower rating is to keep us from speeding out of control with an oversized engine and, since these ratings are mandated by the U.S. Coast Guard, it’s a logical assumption that these capacities are the result of their testing.

## What determines max HP on a boat?

The federal government regulates the horsepower of outboard motors that can be installed on boats. The maximum HP is determined by calculating the boat’s factor (the length multiplied by the width) and then looking up the allowable engine size in a table.

## 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

## How much horsepower does a 16 foot boat need?

For a standard 16-foot aluminum boat, a 60 horsepower motor will suffice. On average, it can have a speed of about 25-30 miles per hour. The load of the boat matters because it affects the speed. Depending on who is inside and what is loaded, the speed varies every time you will use this motor.

## What size motor do I need for a 17 foot boat?

A small motor in the 7 to 10 hp range will usually have enough power to move a 17 ft runabout at hull speed, i e. not on plane. Many jurisdictions have reduced licensing requirements for boats under 10 hp. That is why 9.9 hp motors are very popular!

## How fast is a 9.9 hp boat motor?

Assuming this is a light 14′ utility boat and a standard 9.9, Mercury would recommend a 8.5 to 9.5 pitch prop for the OP’s application and predicts a top speed around 20 mph.

## How fast does a 20 hp boat motor go?

The Honwave 3.5ae with 20hp Tohatsu 4 stroke idles along in slack water at around 2 – 3 mph. Speed varies greatly upon tide / wind etc. Sometimes idle won’t push against the tide where I fish. 2 up the Tohatsu 20hp pushes the Honwave 3.5ae along at around 19 mph.

## How fast is a 40 hp boat motor?

My 17 tracker with 40 hp Mariner will do 31 mph with me and my gear in it (that’s with 3 batteries and full 6 gallon fuel can).

## Can a boat be overpowered?

But not only can hulls be overpowered but also sometimes they can be underpowered! Underpowered boats can be harder to pick because it can sometimes come back to the purchasers intended use.

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## How fast will a 7.5 hp outboard go?

A 7.5 should be around 10-12.

## What happens if boat motor is too high?

If it’s too high, the propeller tends to ventilate, losing its bite on the water and blowing out while turning and in steep seas. “If the prop consistently ventilates when heading down a steep wave, the outboard is probably set too high,” says Dean Corbisier, advertising and public relations manager for Suzuki Marine.