2011 Kawasaki KX 100

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2011 Kawasaki KX 100
2011 Kawasaki KX 100

– 2011 Kawasaki KX 100

2011 Kawasaki KX 100

The Stepping Stone to Big-League Motocross

The gulf between a KX™85 and a full-sized Lites-class motocrosser such as the KX250F is a large one, and rare is the rider who bridges the transition easily. All of which explains the existence of Kawasaki’s KX100 – the ideal stepping stone from minis to the major leagues. With its larger wheels, the KX100 provides adolescent motocross racers and off-road riders with a right-sized motorcycle, one that allows them to focus on riding technique instead of excessive power and heft.

Besides 2-inch larger-diameter wheels than the KX85, the KX100 boasts a larger 99cc liquid-cooled two-stroke engine that offers more power and a broader spread of it than the smaller KX. The engine breathes through a 28mm Keihin carburetor and a carbon-fiber reed valve assembly for crisp throttle response, and is fitted with the Kawasaki Integrated Power-valve System (KIPS®) to help produce that broad powerband with good low-end torque and a strong top-end rush. That impressive power is then routed to a smooth-shifting six-speed transmission, which gives the KX100 a gear for every situation on the race track.

The engine is bolted to a black high-tensile steel perimeter frame with a specially designed fuel tank located inside the frame to lower the fuel load and center of gravity for optimal handling. Adjustable long-travel suspension at both ends helps smooth even the roughest motocross circuits. The 36mm inverted cartridge fork has compression damping adjustment capability, while the UNI-TRAK® rear suspension system comes equipped with a shock that’s fully adjustable for spring preload, compression and rebound damping. In the braking department, both front and rear discs are mounted with shoulder bolts for easier maintenance.

The KX100 also features aggressive Kawasaki graphics to match its black frame and wheels, just like its larger KX siblings.

Those who race their KX100 at designated events are eligible to receive support from Team Green™, Kawasaki’s amateur racing support program. Each year, Team Green provides regional support vehicles and highly trained technicians at more than 100 events, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.


Kawasaki KX 100 model Highlights

Details & Features

Liquid-cooled, 99cc, Two-stroke Engine
– Utilizes a separate clutch cover on the engine’s right side for quick servicing without removing the water pump cover
– Liquid-cooling assures even-running temperatures, consistent power output and greater reliability
– Bridges between intake and exhaust ports are machine-finished for increased durability
– Rotor utilizes rare-earth magnets – the unitized piece is small, light and more efficient; low inertial moment improves low-rpm response
– Connecting rod big-end bearing has a more rigid cage for improved durability
– Intake port shape and cylinder skirt allow cooling air into the crankcase chamber
– Primary gear is secured using a lock-nut to help reduce mechanical noise
– Metafoam gaskets for the generator and water pump covers improve sealing

Kawasaki Integrated Power Valve System (KIPS®)
– KIPS system varies exhaust port height for increased horsepower and torque at all rpm
– Produces a broad powerband with more low-end torque while retaining excellent top-end power
– Breather in KIPS cover improves high-rpm and overrun performance

28mm Keihin Carburetor
– Crescent slide carburetor puts the needle closer to the intake ports for optimum throttle response
– Adjustable for various conditions

– Clutch hub rides on needle bearings for smooth action
– Large clutch plates measure 119mm in diameter for added durability and control
– Clutch-release lever ratio provides light clutch lever action
– Thick clutch basket housing improves durability
– Clutch plate service cover simplifies maintenance and utilizes a metal-carbon composite gasket

Six-speed Transmission
– Fifth and sixth gears ride on bushings for added reliability
– Positive shifting action and rugged durability
– Allows the engine’s full potential to be realized
– Oil level window allows easy level check
– Hard chrome-finished shift forks resist wear and seizure

High-tensile Steel Perimeter Frame
– Wide, steel footpegs for better control and added strength
– Thick footpeg brackets withstand today’s rigorous tracks
– Engine and chassis bolts feature rust-resistant coating

Fuel Tank
– Positioned low in the frame to lower center of gravity and improve handling

UNI-TRAK® Rear Suspension
– Swingarm uses large cross-section beams for more rigidity and control
– Swingarm incorporates cast-aluminum drive chain adjuster sections for easy chain adjustments
– Flanged collars at the bearings to protect seals from mud
– Fully adjustable shock with compression damping, rebound damping and spring preload adjustability

36mm Inverted Cartridge Fork
– Aluminum upper tubes are 49.5mm in diameter for excellent control and steering response
– Compression damping is 18-way adjustable

Front and Rear Disc Brakes
– Front brake lever shape offers better feel
– Forged-aluminum rear brake pedal is strong, lightweight and features two seals at the pivot for smooth operation

Front and Rear Wheels
– Rear hub features two wheel bearings on the drive side for durability
– Thick spokes are used in the front and rear for strength, and require less adjustment
– Lightweight aluminum rims

– Aggressive Kawasaki graphics compliment its black frame and wheels, just like the larger KX models


Key Kawasaki KX 100 Technology


Quick revving, liquid cooled KX85 and KX100 engines share many parts including the crankshaft, transmission, and intake system.

The KX100 achieves its larger displacement and wider powerband via its 4.0 mm larger bore (KX100: 52.5 mm; KX85: 48.5 mm).

The piston has four lubricating holes at the wrist pin for added durability.

Kawasaki Integrated Power Valve System (KIPS) varies exhaust port height for increased horsepower and torque throughout the rev range.

Breather added to KIPS cover relieves exhaust pressure for more precise KIPS valve action contributing to improved high-rpm and overrun performance.

Electrofusion coating on the aluminum cylinder provides rapid heat transfer, superb wear resistance and optimum lubrication retention for increased performance and durability.

Intake port shape and revised cylinder skirt (intake side) allow cooling air into the crankcase chamber.

Keihin PWK28 carburetor features a crescent shaped slide that enables the needle to sit closer to the intake ports for quick throttle response.

Large bores in the front and back of the carburetor and a smooth shape boost flow for more mid-range and top-end power.

Carbon fibre reeds aid throttle response. The carbon fiber weave of the reedvalves is 45 degrees to the intake tract so that the reed is more flexible and correspondingly more responsive at lower rpm.

The right side of the airbox is cut back to increase airflow and draw airfrom behind the number plate as well as below the seat.

Digital Capacitor Discharge Ignition (CDI) precisely controls timing, no matter how fast the rpm changes.

Lighter magneto rotor uses powerful neodium (rare-earth) magnets to lower inertial moment from 6.3 kg/cm2 to 4.0 kg/cm2 which improves low-rpm response.

The flywheel rotor boss and yoke are unitised. The unitised piece is both smaller and more durable, offering improved overrun performance.

Crankshaft primary gear is now secured using a lock-nut instead of a snap ring. The reduced play helps reduce mechanical noise. Connecting rod big-end bearing has a more rigid cage for improved durability and smoother action at high-rpm.

Revised 6-speed transmission has bushings added to 2nd, 3rd, and 4th gears onthe output shaft for increased durability. Fifth and 6th gears on the transmission input shaft also ride on bushings.

The ends of the shift forks are hard-chrome finished for durability.

Thick base at the clutch housing fingers for increased durability.

The right hand engine cover provides a separate clutch cover for quick servicing at the track without removing the water pump.

Engine kill switch now attached with a waterproof coupler for more reliable connection.

Single radiator mounted on the right side keeps the engine cool during long motos.

Gasket material for the generator cover, water pump cover and water pump elboware changed from paper-base to metafoam (SPCC+foam) to improve sealing. Likewise, the clutch cover gasket has been changed from a paper-base toa metal-carbon composite (SPCC+carbon sheet) material. (SPCC: SteelPlate Cold Commercial)




High Tensile Steel Perimeter Frame combines narrow dimensions, steep rake angle and high rigidity for quick handling without sacrificing straight-line ability.

Bolt on tail section eases repairs and maintenance.

The KX85 and KX100 share may chassis components. The two chassis are easiest distinguished by their different wheel/tire sizes and overall dimensions.

KX100 & KX85

Front Tire 70/100-19 70/100-17
Rear Tire 90/100-16 90/100-14
Rake/trail 270 / 103 mm 270 / 89 mm
Seat Height 870 mm 840 mm
Wheelbase 1290 mm 1255 mm

Square insert nuts on the fuel tank provide secure mounting for the shrouds and seat base.

36mm inverted cartridge fork provides a progressive ride to better resist bottoming and fit larger and more aggressive riders.

Inverted forks are more rigid to provide better steering response and control.

Fork compression damping is 18-click adjustable and the cartridge design means better action.

The aluminum upper fork tubes measure 49.5mm in diameter for flex free performance.

Uni-Trak rear suspension settings provide a progressive ride to better resist bottoming and accommodate larger, more aggressive riders.

Fully adjustable rear shock spring preload, 4-click compression damping, and 16-click rebound damping allows the suspension to be tuned for specific conditions.
Two-tone seat cover uses a high-grip top and smooth sides for good grip when sitting and high mobility when riding on the pegs.

Hydraulic front and rear disc brakes feature drilled discs for light weight.

The brake rotors use shouldered hex bolts instead of countersunk screws for easier maintenance.

Forged aluminum rear brake pedal uses two recessed O-rings instead of seals for improved sealing.



Lime Green


2011 Kawasaki KX 100 – USA Specifications
MSRP: $4,099 USD

Engine: Two-stroke single with KIPS®
Displacement: 99cc
Bore x Stroke: 52.5 x 45.8mm
Cooling System: Liquid
Carburetion: Keihin PWK28
Induction: Two-petal reed valve
Compression ratio: 9.6: 1 (low speed) – 8.8: 1 (high speed)
Ignition: Digital CDI
Transmission: Six-speed
Final drive: Chain
Frame Type: High-tensile steel perimeter design with subframe member
Rake/Trail: 27 degrees / 4.1 in.
Front suspension / wheel travel: 36mm inverted telescopic cartridge fork with 18-way compression damping / 10.8 in.
Rear suspension / wheel travel: UNI-TRAK® single shock system with 4-way compression and 18-way rebound damping plus adjustable spring preload / 10.8 in.
Front Tire Size: 70/100×19
Rear Tire Size: 90/100×16
Front brakes / rear brakes: Hydraulic disc / Disc
Overall length: 75.2 in.
Overall width: 28.9 in.
Overall height: 43.5 in.
Ground clearance: 15.0 in.
Seat height: 34.3 in.
Curb weight: 156.5 lbs.
Fuel capacity: 1.5 gal.
Wheelbase: 50.8 in.
Color Choices: Lime Green


2011 Kawasaki KX 100 – Canada Specifications

Type 2-stroke Single with KIPS
Displacement 99 cc
Bore and Stroke 52.5 x 45.8 mm
Compression Ratio 9.6:1 (low speed); 8.8:1 (high speed)
Carburetor Keihin PWK28
Induction 2-petal carbon-fibre piston reed valve
Ignition Digital CDI
Cooling Liquid, twin radiators
Lubrication Pre-mix (32:1), 2-stroke racing oil

Transmission 6-speed, return
Primary Drive Gear
Final Drive Chain
Primary Reduction Ratio 3.400 (68/20)
Gear Ratios: 1st 2.538 (33/13)
2nd 1.875 (30/16)
3rd 1.500 (27/18)
4th 1.250 (25/20)
5th 1.090 (24/22)
6th 0.956 (22/23)
Final Reduction Ratio 3.923 (51/13)
Clutch Wet multi-disc, manual

Type High-tensile steel perimeter with bolt-on steel rear section
Suspension: Front 36 mm upside-down telescopic fork, 18-click compression
Suspension: Rear Uni-Trak with fully adjustable preload, 4-click compression and 16-click rebound damping
Wheel Travel, Front/Rear 275 mm, 275 mm
Tires, Front/Rear 70/90-19 42M, 90/100-16 52M
Caster (Rake) 27.1°
Trail 103 mm

Front Single-piston caliper, 220 mm disc
Rear Single-piston caliper, 184 mm disc

Overall Length 1,910 mm
Overall Width 735 mm
Overall Height 1,105 mm
Wheelbase 1,290 mm
Ground Clearance 380 mm
Seat Height 870 mm
Curb Mass 71 kg
Fuel Capacity 5.5 litres

Colour Lime Green

* The Manufacturer’s Suggested Retail Price does not include freight, pre-delivery inspection or applicable taxes. The final price is at the discretion of the dealer. Prices and Specifications are subject to change without prior notice.

The specifications mentioned here apply to and have been achieved by production models under standard operating conditions. We intend only to give a fair description of the vehicle and its performance capabilities but these specifications may not apply to every machine supplied for sale. Kawasaki Heavy Industries, Ltd. reserves the right to alter specifications without prior notice. Equipment illustrated and specifications may vary to meet individual markets. Available colours may vary by market.

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