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1998 Kawasaki 750 STX Review and Specs [Video]
The short-lived 1998 Kawasaki 750 STX was a 2-stroke, 3-seater Jet Ski, marketed as the smallest brother of the 900 STX and the high-end 1100 STX. It was powered by a 2-stroke, 743cc, twin-carb, 2-cylinder “big-pin” engine rated at 83 HP.
If you want to find out more about this popular 2-stroke Kawasaki Jet Ski, this post is for you.
We at JetDrift have compiled all you need to know into this Kawasaki 750 STX review!
1998 Kawasaki 750 STX Review
Kawasaki 750 STX Hull and Top Deck
The Kawasaki 750 STX was released in 1998 as the smallest member of the STX series.
Its bigger brothers, the 900 STX and the carbed 1100 STX debuted in 1997 and remained in production through 1999 and 2006, respectively.
These skis were considered the successors of the outdated STS 750.The STX 750 enjoyed the widened ’98 STX platform, measuring 122.8 inches in length, 46.5 inches in width, and 39 inches in height. (The width of the ’97 STX model was only 42.5 inches.)
Its deep-V hull design utilized long strakes and a deep keel, which ensured a smooth predictable handling.
It housed a flat 3-rider seat, and a 23-gallon storage space split into a glovebox, bow storage, and a smaller rear storage pocket.
Kawasaki 750 STX Engine and Propulsion
The power source of the Kawasaki 750 STX was a 2-stroke, 743cc, dual-carb, “big-pin” vertical twin Kawasaki Jet Ski engine rated at 83 HP.
This power mill was a huge improvement over the single-carb 750 and small-pin dual-carb 750 engines, which came with less HP and lower durability.
The key features of the dual-carb 750 STX engine were as follows:
- 2-stroke, vertical twin architecture
- “Bin-pin” engine configuration: ported for high-speed performance
- Dual Keihin CDK 40-31 carburetors
- NGK BR8ES spark plugs
- Crankcase reed valve configuration
- Oil injection system
- Magneto CDI ignition system
- Open-loop cooling system
- Electric starter
Thanks to this high-performance jet pump and powerful big-pin engine configuration, the Kawasaki 750 STX could reach a top speed of 48 mph.
It was definitely not the fastest jet ski on the lake, but it built its reputation on great handling and durability.
Kawasaki 750 STX Features
The Kawasaki 750 STX came standard with many innovative features, including:
- Manual reverse system
- Innovative dashboard
- Choke knob
- Fuel knob
- Handlebar-mounted start/stop buttons
- Shut-off switch with safety lanyard
- Front storage compartment
- Fire extinguisher compartment
- Rear storage pocket
- Glovebox
- Tool kit
- Drain plugs
- Finger throttle lever
- Throttle limiter
- Dual mirrors
- Tow hook
- Mooring cleats
- Rear grab handle
- Sponsons
- Underwater exhaust outlet
- Deck mats
Kawasaki 750 STX Specs Charts
For your convenience, we’ve compiled the key specs of the 1998 Kawasaki 750 STX into these charts:1998 Kawasaki 750 STX Engine Specs
| Kawasaki 750 STX | Engine Specs |
|---|---|
| Engine type | 2-stroke, vertical twin, crankcase reed valve, water-cooled |
| Displacement | 743 mL (45.3 cu in.) |
| Bore and stroke | 80.0 x 74.0 mm (3.15 x 2.91 in.) |
| Compression ratio | 7.2 : 1 |
| Ignition system | Magneto CDI (digital) |
| Lubrication system | Oil injection (break-in period: oil injection and gas/oil mixture 50:1) |
| Carburetor | Keihin CDK 40-31 x 2 |
| Starting system | Electric |
| Battery | 12 V 18 Ah |
| Engine oil type | 2-stroke, NMMA Certified for Service TC-W II |
| Engine oil tank capacity | 2.1 L, 2.2 qt (US) |
1998 Kawasaki 750 STX Tuning Specifications
| Kawasaki 750 STX | Tuning Specifications |
|---|---|
| Spark Plug Type | NGK BR8ES |
| Spark Plug Gap | 0.7 ∼ 0.8 mm (0.028 ∼ 0.032 in.) |
| Ignition Timing | 13° BTDC @1250 r/min (rpm) - 20.2° BTDC @4000 r/min (rpm) |
| Carburetor Idle Speed - in water | 1 250 ±100 r/min (rpm) |
| Carburetor Idle Speed - out of water | 1 700 ±100 r/min (rpm) |
| Compression Pressure | 1 270 kPa (13 kg/cm2) 185 psi |
1998 Kawasaki 750 STX Drive System
| Kawasaki 750 STX | Drive System |
|---|---|
| Coupling | Direct drive from engine |
| Jet Pump Type | Axial flow, single stage |
| Steering | Steerable nozzle |
| Braking | Water drag |
1998 Kawasaki 750 STX Dimensions
| Kawasaki 750 STX | Dimensions |
|---|---|
| Overall length | 122.8 in (3 120 mm) |
| Overall width | 46.5 in (1 180 mm) |
| Overall height | 40.2 in (1 020 mm) |
| Fuel tank capacity | 16.4 US gal (62 L) including 1.3 US gal (5 L) reserve |
Takeaways
As a takeaway, we’ve answered the most common questions about the 1998 Kawasaki 750 STX:What is a Kawasaki 750 STX?
The 750 STX was a 2-stroke, 3-seater, sit-down Kawasaki Jet Ski.
What Years Did Kawasaki Make the 750 STX?
Kawasaki marketed the 750 STX only in 1998.
What Size was a Kawasaki 750 STX?
The dimensions of each Kawasaki 750 STX measured 122.8 inches in length, 46.5 inches in width, and 39 inches in height.
How Much Did a Kawasaki 750 STX Weigh?
The dry weight of the Kawasaki 750 STX was 602 pounds.
How Many People Could Ride on a Kawasaki 750 STX?
The Kawasaki 750 STX was rated for three riders.
What Kind of Engine was in the Kawasaki 750 STX?
The Kawasaki 750 STX was powered by a 2-stroke, 743cc, triple-carb, 2-cylinder Big-Pin Kawasaki marine engine.
Was the Kawasaki 750 STX Supercharged?
The Kawasaki 750 STX was powered by a naturally-aspirated engine.
Was the Kawasaki 750 STX a 2-stroke?
Yes, the Kawasaki 750 STX was powered by a 2-stroke engine.
How Much Horsepower Did a Kawasaki 750 STX Have?
The Kawasaki 750 STX produced 83 HP out of the box.
How Much Oil Did a Kawasaki 750 STX Hold?
The Kawasaki 750 STX had an oil injection system featuring a 3.5-quart oil reservoir.
How Much Fuel Did a Kawasaki 750 STX Hold?
The fuel capacity of the Kawasaki 750 STX was 12.2 gallons including 2.0 gallons of reserve.
How Fast Did a Kawasaki 750 STX Go?
The top speed of the Kawasaki 750 STX was about 48 mph under ideal conditions.
Could the Kawasaki 750 STX Tow a Skier or a Wakeboarder?
Thanks to its dual mirrors and 3-rider seat, the Kawasaki 750 STX could legally tow a wakeboarder or skier.
Did the Kawasaki 750 STX Have a Reverse?
No, the Kawasaki 750 STX came standard with a mechanical reverse.
Did the Kawasaki 750 STX Have a Brake?
No, the Kawasaki 750 STX was manufactured without a brake system.
How Much Does a Kawasaki 750 STX Cost?
The asking price of a used Kawasaki 750 STX varies between $1,000 and $3,000 depending on the year and its condition.
