The 1993-2002 Kawasaki KX 250 was a standout in the two-stroke motocross world, praised for its potent engine, competitive handling, and continual improvements. Here’s an in-depth overview:

General Overview

• Model Years: 1993-2002
• Category: Motocross / Off-road
• Engine Type: Two-stroke single-cylinder
• Reputation: Known for its raw power and excellent suspension, the KX 250 became a favorite among motocross enthusiasts and racers.

Engine and Performance

• Displacement: 249 cc
• Cooling System: Liquid-cooled for consistent performance during intense racing.
• Bore x Stroke: 66.4 mm x 72.0 mm
• Compression Ratio: Varied slightly over the years, typically around 8.6:1.
• Carburetor: Keihin PWK carburetor (38 mm), providing excellent throttle response and fueling.
• Horsepower: Approximately 42-46 HP, depending on tuning and model year.
• Power Valve: Kawasaki Integrated Power Valve System (KIPS) for broader power delivery across the RPM range.
• Powerband: Strong mid- to top-end, ideal for aggressive motocross riding.

Drivetrain

• Transmission: 5-speed manual, well-geared for track versatility.
• Clutch: Multi-plate wet clutch, designed for smooth engagement and reliability under stress.

Chassis and Suspension

• Frame: High-tensile steel perimeter frame, providing a good balance of rigidity and flex for motocross handling.
• Front Suspension:
  • Kayaba 43 mm inverted forks (Showa on some later models).
  • Fully adjustable for rebound and compression damping.
  • Approximately 12 inches of travel.
• Rear Suspension:
  • Kawasaki Uni-Trak linkage system with a fully adjustable shock.
  • Around 12.2 inches of travel, offering excellent control over rough terrain.
• Handling: Well-known for its stability and ease of cornering, though slightly heavier than some competitors.

Brakes and Wheels

• Front Brakes: Single 240 mm hydraulic disc with a dual-piston caliper for strong, consistent stopping power.
• Rear Brakes: Single 220 mm hydraulic disc with a single-piston caliper.
• Tires: 21-inch front and 19-inch rear, with motocross-specific knobby treads.

Dimensions and Weight

• Seat Height: Approximately 37.2 inches, standard for motocross bikes.
• Ground Clearance: Around 13 inches, ideal for jumping and navigating obstacles.
• Weight: Approximately 223 lbs (dry), on par with other two-stroke competitors.
• Fuel Capacity: 2.1 gallons, sufficient for motocross races and practice.

Notable Updates by Year

1. 1993:
   • All-new design with a revised chassis for improved handling.
   • KIPS power valve system updated for smoother transitions between low and high RPMs.
2. 1994-1995:
   • Improved suspension damping and minor engine refinements.
   • Ergonomic updates for better rider comfort and control.
3. 1996:
   • Further engine refinements for increased mid-range power.
   • Updated graphics and bodywork.
4. 1997-1999:
   • Redesigned cylinder porting and KIPS updates for more top-end power.
   • Revised rear suspension geometry for better traction and control.
5. 2000-2002:
   • Frame and suspension tweaks for improved handling.
   • Engine refinements to make the powerband more linear and manageable.
   • New bodywork and graphics for a modern look.

Features

• Ergonomics: Slim and compact design, making it easy for riders to shift their weight and maintain control.
• Exhaust: Tuned expansion chamber for optimal two-stroke performance.
• Build Quality: Known for durability and reliability under demanding motocross conditions.

Pros

• Strong, consistent engine performance with broad power delivery.
• Robust suspension that excels on jumps and rough terrain.
• Durable and reliable, even under extreme use.
• Excellent aftermarket support for parts and modifications.
• Easier to maintain and repair compared to four-stroke counterparts.

Cons

• Requires regular maintenance, including frequent top-end rebuilds typical of two-stroke engines.
• Slightly heavier than some competitors, affecting agility in tight sections.
• Vibrations can be more noticeable compared to modern bikes.
• Discontinued after 2002, making OEM parts harder to source.

Riding Experience

• The KX 250 is a powerful, high-revving bike with aggressive handling characteristics, best suited for experienced riders.
• It shines on open motocross tracks with its strong mid- to top-end power and stable handling.
• While it has a manageable powerband thanks to the KIPS system, its explosive performance demands skill to harness effectively.

Legacy

• The KX 250 dominated motocross racing during much of the 1990s and early 2000s, competing with other two-stroke legends like the Honda CR250R and Yamaha YZ250.
• Even after its discontinuation, the KX 250 remains a favorite among vintage motocross enthusiasts and collectors.
• Its performance, combined with Kawasaki’s reputation for durability, ensures its place as one of the most respected two-stroke motocross bikes of its era.

If you’re restoring or maintaining a KX 250 from this period, the bike’s robust aftermarket community makes it easier to find parts and upgrades. Its iconic status ensures it remains a beloved choice for those seeking the thrill of a two-stroke motocross machine.