2020 Sea-Doo RXT-X RS 300: Review, price and specs - (2022)

What is it?

The Sea-Doo RXT-X RS 300 is one of the fastest Jet Skis and personal watercraft on sale in Australia with an estimated top speed of 125kmh in ideal conditions.

It is the first to be fitted with “launch control” for a super-quick start (although you must be in the right mode to activate this function).

This generation of the RXT-X RS 300 went on sale in 2018 as a 2019 model year and is a completely new design from the ground up.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (1)

It is part of Sea-Doo’s ST3 hull family, which is Sea-Doo’s largest premium hull and deck combination.

Changes for 2020 amounted to new colour and trim combinations and the standard fitment of a 70-litre fuel tank (rather than the 60-litre fuel bladder fitted to 2019 models).

When it arrived in late 2018, the Sea-Doo RXT-X RS 300’s ST3 deck and hull revolutionised the watercraft industry with a new way to access the front storage area.

Rather than the rider leaning over the handlebars to access the front hatch (as per Yamaha and Kawasaki), the handlebars lift up with the top console, providing easy access to a large storage area.

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Engine

The Sea-Doo RXT-X RS 300 is powered by a supercharged 1630cc three-cylinder Rotax engine.

Sea-Doo claims it produces 300 horsepower, making it the second most powerful watercraft on sale after the Kawasaki Ultra 310 (which has a claimed 310 horsepower). Yamaha does not make a horsepower claim for its supercharged WaveRunners.

This is to date the most powerful variant of this Sea-Doo engine out of the factory.

(Video) RXT-X 300 REVIEW *300HP SUPERCHARGED SEA-DOO* (2020 California Green)

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (3)

How much does it cost?

The 2020 Sea-Doo RXT-X RS 300 costs from $26,399 not including registration and trailer, which typically adds $1500 to $2000 depending on the quality and type of trailer and state registration fees.

This represents a price rise of $2300 on the previous model year, but Bluetooth audio speakers (previously an $800 option) are standard on the 2020 model, and there is no extra cost for the choice of colours (previously a $300 option). The 2020 model year also gained a larger, 70-litre fuel tank in place of the 60-litre fuel bladder.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (4)

This watercraft would suit…

The Sea-Doo RXT-X RS 300 suits experienced riders and thrill seekers due to its sheer performance.

However, it would also suit riders who are new to the sport; they can step up gradually with the “speed key” that comes with each watercraft, as their skills progress.

You can start on the speed-limited key before building up to speed key that unlocks wide open throttle.

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Pros

The Sea-Doo RXT-X RS 300 has one of the most user-friendly top-decks in the personal watercraft market.

There is easy access to a large storage area in the nose (available with optional mesh storage pockets), plus a waterproof glovebox to store a phone and other valuables.

The audio system has a premium sound, though is more useful at low speeds or when stopped.

The digital instrument display includes a distance-to-empty meter (a rarity in the watercraft class and, for now, exclusive to Sea-Doo), as well as a GPS-based speedometer and an accurate fuel gauge.

(Video) 2020 RXTX 300 In-depth Review

The RS badge signifies an unrestricted top speed (about 125kmh in ideal conditions); models sold in the US are limited to about 110kmh.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (6)

This is a large and sturdy craft and ideal for carrying one or two passengers. However, as with all sit-down watercraft it is more nimble when operated solo.

A large 70-litre fuel tank provides a decent about a range for a day of riding.

The large rear deck can accomodate a range of Sea-Doo accessories including a cooler box and a 15-litre fuel bladder.

The seats are comfortable and narrow, so you’re less likely to get leg abrasions after a long day on the water.

The digital instrument displays also pivots to the same angle as the handlebars, making it easy to see. On other watercraft, handlebars in their highest position can obscure the dash display.

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Cons

The large footwells can fill with water. This can be resolved with a quick blast of the throttle when you’re on the water, however when you’re cleaning the craft you may wish to invest in a wet vacuum. Even tilting a trailer is not enough to clear all the water out of the footwells.

The handlebar height adjustment has plastic notches, which can slip out of position after a decent bump.

The waterproof glovebox is excellent but a slightly larger cubbie would be welcome.

The grip mats in the foot well are slippery compared to those on the Yamaha and Kawasaki. A rear boarding step is optional.

The bulging hand grips can cause blisters, even when wearing decent gloves.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (8)

(Video) 2019 Sea-Doo RXT-X 300 Review - It Hits 60 MPH How Quick!?

What’s it like to ride?

The Sea-Doo RXT-X RS 300 is at home in small to medium chop and is stable at high speeds in flat water.

It launches cleanly and faster than most other supercharged watercraft (which can cavitate as the jet pump struggles for ‘grip’), especially when the Sea-Doo RXT-X RS 300 is in launch control mode and in the correct trim setting.

Power delivery is smooth and instant, and top speed is a genuine 120kmh-plus in ideal conditions (depending on water temperature, current, chop, rider weight, and fuel load).

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (9)

At low speeds it’s not quite as manoeuvrable as similarly-sized rival watercraft. It needs about 30kmh-plus on board and a bit of a lean before the sponsons bite in tight turns.

In big swell the nose of the deep V hull can get pushed around a bit when cutting across waves at an angle.

In general, though, this is a highly capable watercraft with excellent performance. It is best suited to flat water and medium chop rather than ocean riding.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (10)

Fuel use

According to the brochure, the Sea-Doo RXT-X RS 300 can run on regular 91 octane unleaded, however 95 or 98 octane premium is recommended for slightly better fuel range and slightly more power.

It is also helpful to run better quality fuel on watercraft used infrequently, as fuel goes “stale” over time.

In our testing the Sea-Doo RXT-X RS 300 used about 55 litres per 100km at moderate throttle in open water.

Repeated hard acceleration, extended periods of wide open throttle, towing, and carry extra passengers will dramatically increase fuel use.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (11)

(Video) Sea-Doo RXT-X 300 Watercraft Technical Overview

Servicing

Sea-Doo recommends a first service at 10 hours (unlike the free first service inspections for cars, there is a cost for this), in which the oil and oil filter are changed and the watercraft is given a detailed safety check.

From there, routine service intervals are 12 months or 50 hours, whichever comes first (versus 12 months / 100 hours for Yamaha and 12 months / 25 hours for supercharged Kawasaki models).

However, as with all watercraft, it is advisable to service before and after each riding season (six month intervals), to avoid excessive corrosion around the oil filter, and to make sure it’s ready to ride at a moment’s notice.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (12)

Warranty

The Sea-Doo RXT-X RS 300 is covered by a two year factory warranty (versus three years for Yamaha and five years for Kawasaki). However, it is worth noting Sea-Doo regularly runs promotions which offer longer warranty periods, so be sure to check.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (13)

Tips for flushing after each ride

The Sea-Doo RXT-X RS 300 requires special attention when flushing the watercraft after a ride. To avoid damage to the carbon seal (which can overheat when the engine is run for too long while the craft is not submerged in water) it is important to only flush the Sea-Doo RXT-X RS 300 for between 90 seconds and two minutes.

To avoiding flooding, be sure the engine is running before you start the fresh water flush, and remove the hose before shutting down the engine. For more detailed instructions, check with your local Sea-Doo dealer.

2020 Sea-Doo RXT-X RS 300: Review, price and specs - (14)

To sum up

The Sea-Doo RXT-X RS 300 is a flagship performance watercraft that blends comfort with speed. The practical layout of the top deck and controls make it one of the most user-friendly watercraft in the class.

Compare with

(Video) 2021 Sea-Doo RXP-X & RXT-X & GTR Specs, Features & Accessories

The Sea-Doo RXT-X RS 300 compares closest in size, performance, and price to the Yamaha FX SVHO and Kawasaki Ultra 310.

Review watercraftsupplied by Beaches Sea-Doo And Can-Am

FAQs

How fast is the RXT-x 300? ›

When it comes to the engine, it's a 4-stroke, 3-cylinder, supercharged Rotax 1630 ACE producing thrilling 300HP. With this power plant, the RXT-X 300 can hit (limited) 67 mph and it can take the rider from 0-30 mph in 1.5 seconds, and 0-60 mph in around 3.6 seconds.

How much does a Sea-Doo RXT 300 cost? ›

The flagship 2022 Sea-Doo RXT-X300 has increased in price from $26,599 to $29,209 excluding trailer and registration, meaning it will be more than $30,000 by the time it is towed off the showroom floor.

Is the Sea Doo RXT-X 300 supercharged? ›

The Sea-Doo RXT-X RS 300 is powered by a supercharged 1630cc three-cylinder Rotax engine. Sea-Doo claims it produces 300 horsepower, making it the second most powerful watercraft on sale after the Kawasaki Ultra 310 (which has a claimed 310 horsepower).

How long does it take to break in a Sea-Doo? ›

After 5-hours of operation, the ECU will fully unlock the throttle, as well as the RPM curve and X-module operations (if so equipped). The Owner's Manual dictates that the proper break-in period last 10-hours of operation, yet the ECU will allow the watercraft to operate unrestrained at 5-hours.

What is the most powerful Sea-Doo model? ›

The Most Powerful Engine on a Sea-Doo, Ever.

The Rotax® 1630 ACE™ - 300 is the most powerful Rotax® engine ever, delivering high efficiency and the best-in-class acceleration with a supercharged thrill factor.

Which Sea-Doo is the fastest? ›

The Sea-Doo RXP-X300 has had its biggest overhaul in nine years, with a completely new model that promises to be the world's fastest-accelerating personal watercraft. With a claimed 0 to 100kmh time of less than three seconds – in launch mode – the 2021 Sea-Doo RXP-X300 aims to be the quickest watercraft on sale today.

What is the most powerful wave runner? ›

Kawasaki Ultra 310LX

The most powerful Jet Ski on the water, the all-new 2022 Kawasaki Jet Ski Ultra 310LXis the flagship model for the brand. It's a 3-seater with 310 horsepower and a big tank. This is the fastest personal watercraft, it's reliable and it has a built-in marine stereo.

What is the fastest jet ski? ›

The record for the top speed ever reached on a watercraft belongs to Uva Perez, who recently hit a whopping 127 mph on a modified Yamaha Waverunner.

What is the biggest jet ski? ›

Sea-Doo LRV- The Only 4-Seater Sea-Doo

Let's start with the largest model, the Sea-Doo LRV, the largest jet ski ever made. This 4-seater Sea-Doo was built on a 156-inch long and 61-inch wide hull that featured a sun deck behind its seat.

What is the Sea-Doo tech package? ›

In a nutshell, Sea-Doo's Tech Package includes the BRP Premium Audio System and the Full Color 7.8” wide display. While this package comes standard on the GTX Limited, it's optional on some other high-end models. If you want to find out more about these features, keep reading.

What is the biggest Sea-Doo? ›

The RXT-X brings 300 HP of adrenaline-filled fun to every adventure. The revolutionary hull design and Ergolock seating system offer maximum control and confidence in any conditions.
...
RXT-X 300.
Vehicle Length135.9" / 345.1 cm
Vehicle Width49.4" / 125.5 cm
Vehicle Height45.2"/ 114.7 cm
Dry weight829 lb / 376 kg

How fast does a 300 HP jet ski go? ›

How fast does a Sea-Doo RXP-X 300 go? While the official (limited) top speed of the 2021 Sea-Doo RXT-X 300 is around 67-69 mph, based on real-life tests it can hit an amazing 73.8 mph without the speed limiter! The reduced weight also means a better power-to-weight ratio, which results in better acceleration.

How much horsepower does a RXT 300 have? ›

The RXT-X brings 300 HP of adrenaline-filled fun to every adventure. The revolutionary hull design and Ergolock seating system offer maximum control and confidence in any conditions.

Where is the gas tank on a Sea Doo RXT? ›

SEA-DOO HOW TO SERIES - PROPER FUELING - YouTube

How often should you change the oil in a Sea-Doo? ›

Maintenance schedule

Ride for up to 100 hours or one year before your first oil change (100 hours for the Sea-Doo SPARK and 50 hours for all other models). After that you'll only need one oil change every 100 hours or one year.

How do you break in a RXT 300? ›

Proper Break-In of a 2021 Sea-Doo RXP-X 300: The Watercraft Journal ...

How often do you service Seadoo? ›

Your Sea-Doo maintenance should include oil changes, and these occur every 50-100 hours (after the 10-15hrs first service), or after one year of use (whichever comes first) . Sea-Doo SPARK can continue for 100 hours, while all other models need an oil change after 50.

Which jet ski is most reliable? ›

The most reliable Jet Ski on the market is the WaveRunner FX. The WaveRunner is a model that is created by Yamaha, and it is technically not a Jet Ski. These terms WaveRunner and Jet Ski are often used interchangeably, but only the Kawasaki brand makes the Jet Ski.

What is the difference between a Sea-Doo RXP and RXT? ›

The 3-seater Sea-Doo RXT-X is actually a modified GTX Limited, tuned for performance over comfort. In contrast, the 2-seater RXP-X is a purpose-built performance ski featuring the smaller TR-3 hull. If you want to find out the differences between these models, you've come to the right place.

How can I make my Sea-Doo faster? ›

The 7 best ways to make your jet ski faster are as follows:
  1. Choose the right ski.
  2. ECU reflash.
  3. Impeller/wear ring upgrade.
  4. Air intake upgrade.
  5. Exhaust system mods.
  6. Engine mods.
  7. New ride plate, intake grate, sponsons.

What is the top of the line Sea-Doo? ›

The Most Powerful Engine on a Sea-Doo, Ever.

The Rotax® 1630 ACE™ - 300 is the most powerful Rotax® engine ever, delivering high efficiency and the best-in-class acceleration with a supercharged thrill factor.

How long does a jet ski last? ›

Most jet ski models have a lifespan of approximately 300 hours, but if properly maintained they can last much longer.

Is 50 mph fast for a jet ski? ›

Jet skis can go as fast as 42-67 mph depending on the make and model. The slowest jet skis are the Rec-Lite models with a top speed of 42-50 mph, while the fastest jet skis can all reach 67 mph.

Videos

1. INSANE SPEED * The Quickest PWC/Jet Ski you can buy * SEA-DOO RXT-X 300 Review * 0-60 MPH, 1/4 Mile
(DragTimes)
2. Whats New for Sea Doo's 2021 RXTx 300?
(NielsensTV)
3. Brand New 2020 RXTX 300
(before Mondays.)
4. 2020 Sea Doo Rxp 300 Review
(Jet boat John)
5. 2021 SEA-DOO RXT-X 300 IBR + SOUND SYSTEM
(Alcoa Good Times, Inc.)
6. 2019 Sea-Doo RXT X300 jet ski review | boatsales
(boatsales)

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