Compare Specs Discover '24 PWCs Browse Reviews
2012-2017 Sea-Doo GTX S 155 Review and Specs [Video]

2012-2017 Sea-Doo GTX S 155 Review and Specs [Video]

The 2012-2017 GTX S 155 was the most affordable suspension Sea-Doo ever built. This ski was basically a base GTX 155 with a manually-adjustable “S” suspension seat.

If you want to find out more about this “budget” suspension Sea-Doo, this post is for you.

We at JetDrift have compiled all you need to know into this Sea-Doo GTX S 155 review!

2012-2017 Sea-Doo GTX S 155 Review

The first Sea-Doo GTX 155 debuted in the 2007 season. This ski was built on the “old” GTX hull and featured a naturally-aspirated Rotax 4-TEC enigne rated at 155hp.

It was a reliable and predictable touring ski with great capacities. Because of this, it instantly became popular among novice riders and families.

The GTX 155 was completely revamped for 2010, when it got the all-new S3 hull and the refreshed GTX deck.

The 2010 GTX line included two larger supercharged variants, the GTX iS 215 and the flagship GTX Limited iS 260.

Two years later, this family was expanded with the GTX S 155, which was basically a GTX 155 completed with a manually-adjustable suspension seat.

Let’s drill into the details and take a closer look at this model!

Sea-Doo GTX S 155 Hull

As a rule of thumb, each Sea-Doo GTX was built on the S3 platform in the early 2010s, and the the GTX S 155 was no exception.

Introduced in 2008, this innovative platform was designed from scratch for the touring (GTX) and performance/touring (RXT) Sea-Doo lines. It also found its way into the GTX-based Wake series.

Its name came from an abbreviation of “Stepped, Stable, Strong,” but the manufacturer didn’t go overboard with these phrases.

The S3 offered industry-leading stability and an outstanding rough-water performance. Its stepped design reduced the water drag, which converted into better fuel economy and a faster acceleration.

Regarding specifications, the GTX S 155 measured 139 inches in length, 48 inches in width, and 43.9 inches in height in the early years. For 2015, the hull was slightly leghtened and widened but the increase was only 0.2 inches.

The S3 hull was completed with a unique two-piece “suspension top deck” which housed the innovative S suspension system.

Unfortunately, this unit was quite heavy, which increased the overall weight of the ski by 140-145 pounds.

On top of that, the GTX S 155 gained more weight over the years, as its dry weight increased from 961 to 1018 pounds.

The hull and deck of the GTX line was completely redesigned for the 2018 season, but the GTX S 155 couldn’t live up to that.

After six years of production, Sea-Doo discontinued this model at the end of 2017.

Sea-Doo GTX S 155 Suspension

While the more advanced “iS” Sea-Doos enjoyed the electronically-adjustable suspension, the GTX S 155 came standard with a manually-adjustable “S” suspension system.

Both systems shared the same arms, shock, and spring, but the former could be adjusted on the fly with a handlebar-mounted switch.

In contrast, the “S” suspension system could be hardened or softened by manually adjusting a bolt with a socket wrench.

In return, it was much simpler than it computer-controlled counterpart. This simplicity translated to higher reliabiltiy and a lower price tag.

The suspension system was nestled between the upper and lower parts of the deck.

The lower part was fixed to the hull while the upper part (including the seat and the control unit) was connected to it with aluminum arms.

Between them you could find the FOX shock and a heavy-duty spring, which efficiently dampened the negative effects of the chop.

Sea-Doo GTX S 155 Engine and Propulsion

The Sea-Doo GTX S 155 was powered by a 4-stroke, naturally-aspirated, 1494cc, SOHC, 12-valve, Rotax triple engine rated at 155hp.

This powerhouse was marketed as Rotax 4-TEC for many years, but it was renamed the Rotax 1503 NA in 2016.

The most important specs of this unit were as follows:

The GTX S 155 shared its jet pump with the GTX 155. The key features of this jet setup were as follows:

Sea-Doo GTX S 155 Features

Except for its suspension seat, the features of the GTS S 155 and GTS 155 were identical.

In a nutshell, the most important ones included:

  • Interactive Multifunction Digital Information Center
  • Sea-Doo learning keys
  • Digitally Encoded Security System (D.E.S.S.™)
  • Floating safety lanyard
  • Handlebar-mounted start/stop buttons
  • Electric Variable Trim System (VTS)
  • Removable, watertight front storage bin
  • Glovebox
  • Swim platform storage
  • Adjustable handlebar
  • Tilt steering
  • Palm rest grips
  • 3-rider touring seat
  • Set strap
  • Splash deflector
  • Dual drain plugs
  • Finger throttle lever
  • Tow hook
  • Mooring cleats
  • Bumpers
  • Rear grab handle
  • Quick latch fuel filler design
  • Foam flotation
  • Sponsons
  • Deck mats
  • Adjustable mirrors
  • Fold-down reboarding step
  • Ski tow eye

Sea-Doo GTX S 155 Performance

The Sea-Doo GTX S 155 was known for a safe and predictable riding experience.

Its deep-V S3 hull combined with the advanced suspension system smoothed out the ride even on choppy days.

The ski was less playful than the smaller Rec-Lite and Recreation models due to its larger and heavier platform. In retun, it offered singificanlty more stability and greater capacities.

Its naturally-astirated engine produced a top speed of 55-56 mph out of the box. Although it was 10 mph slower than supercharged models, its performance was more than enough for the average rider.

This engine used not only much less fuel, but it was also far more durable and reliable than its supercharged variants.

Sea-Doo GTX S 155 Specs Charts

For your convenience, we’ve compiled the main specifications of the Sea-Doo GTX S 155 into these charts:

Sea-Doo GTX S 155 Engine Specs

Engine SpecsSea-Doo GTX S 155
TypeRotax 4-TEC, Single Over Head Camshaft (SOHC)
Intake system TypeNaturally aspirated
Electronic Throttle body60mm (2.4 in)
Number of cylinders3
Number of valves12 valves (4 per cylinder) with hydraulic lifters (no adjustment)
Displacement1494 cc (91.2 cu. in)
Bore100 mm (3.9 in)
Stroke63.4 mm (2.5 in)
Compression ratio10.6:1
Ignition system typeIDI (inductive discharge ignition)
StarterElectric
Spark plug - Make and typeNGK, DCPR8E
Spark plug - Gap0.75mm (.03 in)
Battery12 V, 30 Ah, Electrolyte type
Cooling systemClosed-loop system

Sea-Doo GTX S 155 Fluids

FluidsSea-Doo GTX S 155
Fuel TypeUnleaded
Fuel tank capacity60 L (16 U.S. gal.)
Engine oil TypeXPS synthetic blend oil (summer grade).
Engine oil Capacity3 L (3.2 qt (U.S. liq.)) Oil change w/filter
Cooling system Capacity5.5 L (5.8 qt (U.S. liq.))

Sea-Doo GTX S 155 Propulsion System

Propulsion systemSea-Doo GTX S 155
Propulsion systemSea-Doo direct drive
Jet PumpAluminum, Axial flow, single stage. Large hub with 10-vane stator
ImpellerStainless steel
TransmissionElectronic: iBR, Direct drive, (forward/neutral/reverse)
VTS systemYes

Sea-Doo GTX S 155 Dimensions and Capacities

Dimensions and CapacitiesSea-Doo GTX S 155
Number of passengers (Driver incl.)3
Load limit (passengers + luggage)500 lb
Storage capacity13.7 U.S. gal
Weight (dry)961 - 1018 lb*
Length139 – 139.2 in*
Width48 – 48.2 in*
Height45.9 in
*May vary depending on the model year These charts are for informational purposes only! For exact specifications, please refer to the factory manual.

Takeaways

As a takeaway, we’ve answered the most common questions about the Sea-Doo GTX S 155:

What is a Sea-Doo GTX S 155?

The Sea-Doo GTX S 155 was a naturally-aspirated suspension Sea-Doo.

When did the Sea-Doo GTX S 155 Come Out?

The Sea-Doo GTX S 155 was manufactured from 2012 through 2017.

What Size was a Sea-Doo GTX S 155?

The 2012-2014 Sea-Doo GTX S 155 measured 139 inches in length, 48 inches in width, and 45.9 inches in height. Its revamped 2015-2017 successor was 135.9 inches long and 48.2 inches wide.

How Much Did a Sea-Doo GTX S 155 Weigh?

The dry weight of the Sea-Doo GTX S 155 was 961-1018 pounds depending on the model year.

How Many People Could Ride on a Sea-Doo GTX S 155?

The Sea-Doo GTX S 155 was rated for three riders.

What Kind of Engine was in the Sea-Doo GTX S 155?

The Sea-Doo GTX S 155 was powered by a 4-stroke, fuel-injected, 1494cc, SOHC, inline-3, Rotax engine.

Was the Sea-Doo GTX S 155 Supercharged?

The Sea-Doo GTX S 155 utilized a naturally-aspirated engine.

Was the Sea-Doo GTX S 155 a 4-Stroke?

The Sea-Doo GTX S 155 was powered by a 4-stroke engine.

How Much HP Did a Sea-Doo GTX S 155 Have?

As the name suggests, the Sea-Doo GTX S 155 produced 155hp in stock condition.

How Much Fuel Did a Sea-Doo GTX S 155 Hold?

The fuel capacity of the Sea-Doo GTX S 155 was 16 gallons.

How Much Oil Did a Sea-Doo GTX S 155 Hold?

The Sea-Doo GTX S 155 required 3.2 US quarts of oil with filter (5.1 quarts total).

How Much Weight Could a Sea-Doo GTX S 155 Hold?

The weight capacity of the Sea-Doo GTX S 155 was 500 pounds.

How Much Gear Could a Sea-Doo GTX S 155 Carry?

The total storage capacity of the Sea-Doo GTX S 155 was 13.7 gallons.

How Fast Did a Sea-Doo GTX S 155 Go?

The top speed of a Sea-Doo GTX S 155 was 55-56 mph under ideal conditions.

Could the Sea-Doo GTX S 155 Tow a Skier or a Wakeboarder?

Due to its three-rider saddle, the Sea-Doo GTX S 155 could legally tow a wakeboarder or skier.

Did the Sea-Doo GTX S 155 Have a Reverse?      

The Sea-Doo GTX S 155 came standard with an electric reverse system.

Did the Sea-Doo GTX S 155 Have a Brake?          

The Sea-Doo GTX S 155 was manufactured with the iBR brake and reverse system.

How Much Does a Sea-Doo GTX S 155 Cost?

The asking price of a used Sea-Doo GTX S 155 varies between $6,000 and $13,000 depending on the year and its condition.