2000 MOTOCROSS GUIDE!
125cc MOTOCROSS BIKES
Brand: Yamaha
Model: YZ125
Suggested retail: $4899
1. Motor changed to deliver more mid range and over-rev
2. Exhaust port enlarged
3. YPVS valve enlarged 2mm to 29.3mm
4. Ignition timing and carburetor setting is changed
5. Drive axle spline changed from hexagonal to involute to improve shifting (YZ400 style)
6. Gearbox stopper lever has upgraded bearing and design for smoother shifting
7. Clutch pressure plate totally redesigned
8. Rear frame is 10mm lower
9. Rear frame is now aluminum semi square pipe
10. Forks use aluminum piston rod to save weight
11. New low friction fork dust seal
12. New low friction outer fork tube
13. Shock has low-speed and high-speed compression damping adjusters
14. Handlebar mount is moved 10mm forward
15. Front fork clamp width increased 5mm and inside rib is added
16. Clutch lever ratio is changed for a lighter pull and less free play
17. One touch adjustment to clutch lever while riding
18. Front fender is new design
19. Front number plate is new design
Brand: Honda
Model: CR125
Suggested retail: $4899
1. Larger airbox is moved 15mm farther forward
2. 36mm Mikuni TMX flat-slide carburetor
3. Carbon Fiber reed-valve pedals
4. Redesigned cyclinder head has larger water jacket
5. Nikasil-plated cylinder reduces friction
6. Piston ring groove is anodized for durability
7. RC (Revolutionary Control) exhaust valve (design from NSR roadracer)
8. New pipe
9. 16-bit processor in the ignition CPU
10. Clutch plates increased from 7 to 8
11. New dual radiators
12. Steel water-pump gear
13. Steel kickstarter-shaft
14. New frame – smaller, lighter twin-spar aluminum with semi-double engine cradle
15. Main frame spars narrowed from 90mm to 80mm
16. Frame spars are lower
17. Forged aluminum steering head replaces extruded piece
18. Upper and lower triple clamps are redesigned
19. Rake changed from 27 degrees to 26.35 degrees
20. Shock has low-speed and high-speed compression damping adjusters
21. Forks use rubber bladder to minimize aeration-induced damping forces
22. All-new swingarm has 25% increase in rigidity
23. Pro-Link reduced in weight by 3.5 ounces
24. Linage mounting on frame is raised 10mm
25. Rear axle diameter increased from 20mm to 25mm
26. New dual-piston front brake caliper with steel pistons
27. 240mm front and rear brake rotors
28. All new fenders, shrouds and sidecovers
29. Reshaped seat with softer foam
30. Rear sprocket increased from 51 teeth to 52 teeth
31. Removable rear subframe allows easy access to airbox
Brand: KTM
Model: 125SX
Price: $4,998
1. Bore and stroke is 54.25mm by 54mm.
2.Requires you use 92 Octane pump gas.
3.Multi-disc wet clutch with Magura hydraulic clutch.
4. Has six-speed transmission.
5. Kokusan 2K-1 digital ignition.
6. Tips the scales at 202.8 lbs.
7. Features no-link WP PDS shock system.
8. Has 38mm Keihen PWK 38 AG PJ carburetor.
9. Excel 1.60″-21 front rim and Excel 1.85″-19 rear rim.
10. Tires are Bridgestone M77 and M78.
11. Four position top triple clamp with aluminum handlebars.
12. Both front (260mm) and rear (220mm) feature the cauliflower rotor design.
13. Steering head angle is 63 degrees.
14. Final drive is 13:50.
15. Wheelbase is 57.5 inches.
16. Seat height is 36.4 inches.
Brand: Kawasaki
Model: KX125
Suggested retail: $4849
1. Port timing and exhaust port shape revised
2. Four dowel pins locate the cylinder to the crankcase
3. New electrofusion cylinder
4. Larger governor bearing and hardened KIPS valve
5. New carburetor jetting for more mid-range power
6. 8mm longer intake manifold
7. Throttle Responsive Ignition Control (K-TRIC) uses a sensor to alter ignition timing according to throttle position
8. Power jet system uses electronic solenoid to close fuel passageway at 9600 rpm
9. Cast aluminum swingarm section reduces weight and adds strength
10. Shock has low-speed and high-speed compression damping adjusters
11. Triple rate shock spring
12. Forks use rubber bladder to minimize aeration-induced damping forces
13. Forks use .41kg/mm springs
14. Increased internal polishing of forks
15. New fork piston assembly
16. Redesigned front brake caliper
17. Improved dust seals at the rear brake lever and caliper
18. One tooth larger rear sprocket
19. U-shaped rims have no shoulder to catch mud
20. New handlebar bend
Brand: Suzuki
Model: RM125
Suggested retail: $4949
1. Piston ring locating pin is moved to rear of piston, 180 degrees from the exhaust valve
2. Third scavenging port is divided with a bridge to support new Piston ring pin location
3. First and second scavenging port are reshaped for smoother flow
4. Exhaust port width reduced 1mm and reshaped
5. Exhaust valve port and exhaust valve shape has been modified for improved low and mid-range
6. All new exhaust valve control system (from direct type to L-arm)
7. New carbon fiber reed pedals
8. Crankshaft inertia increased by 1.6% with an increase in primary compression (about 2%) for improved power accessibility and traction control
9. New pipe is factory race team pipe for harder pull from mid-to-high rpm
10. CDI box located near airbox for better protection
11. Gearshift cam plate shape is modified so that neutral gear position is easier to find
12. Frame is reinforced for additional strength and improved rear end stability
13. Rigidity improved by 10mm height increase of the forward cast swingarm area
14. Fork spring rate increased from .40 kg/mm to .42 kg/mm
15. Shock compression damper valve and case diameter is increased
16. Shock has larger oil flow route which reduces oil flow resistance
17. Shock spring rate changed from 4.7-5.3-6.1 to 4.8 – 5.2
18. Brake pads changed for better feel
19. Footpeg width increased 6mm to include three row of teeth
20. Rear axle diameter increased from 2omm to 22mm
21. Rear hub is wider and lighter
22. New grips
250cc MOTOCROSS BIKES
Brand: Yamaha
Model: YZ250
Suggested retail: $5699
1. Motor changed to deliver more mid range and top end power
2. Carburetor equipped with throttle position sensor
3. Carburetor’s power jet is relocated
4. Silencer is shortened 25mm and tip diameter is increased
5. Clutch pressure plate totally redesigned
6. Main frame material is changed to reduce weight
7. Rear frame is 10mm lower
8. Forks use aluminum piston rod to save weight
9. New low friction fork dust seal
10. New low friction outer fork tube
11. Shock has low-speed and high-speed compression damping adjusters
12. Handlebar mount is moved 10mm forward
13. Front fork clamp width increased 5mm and inside rib is added
14. Clutch lever ratio is changed for a lighter pull and less free play
15. One touch adjustment to clutch lever while riding
16. Front fender is new design
17. Front number plate is new design
Brand: Honda
Model: CR250
Suggested retail: $5799
1. Larger airbox is moved 15mm farther forward
2. 38mm Keihen flat-slide carburetor with triple-taper needle
3. Six-petal reed valve
4. Reshaped CRV rotary/flap exhaust valve
5. Sub-exhaust valve port raised 1mm
6. New pipe
7. 16-bit processor in the ignition CPU
8. New radiator provides 10% more surface area
9. Steel water-pump gear
10. All new frame with smaller, lighter twin-spar aluminum with semi-double engine cradle
11. Main frame spars narrowed from 90mm to 80mm
12. Frame spars are lower
13. Upper and lower triple clamps are redesigned
14. Inner surface of front fork outer-tubes are molybdenum coated
15. Rear shock case is molybdenum coated
16. All-new swingarm has 25% increase in rigidity
17. Shock has low-speed and high-speed compression damping adjusters
18. Rear shock’s damper piston diameter increased from 46mm to 50mm
19. Pro-Link reduced in weight by 3.5 ounces
20. Linage mounting on frame is raised 10mm
21. Rear axle diameter increased from 20mm to 25mm
22. New dual-piston front brake caliper with steel pistons
23. 240mm front and rear brake rotors
Brand: Kawasaki
Model: KX250
Suggested retail: $5699
1. New porting for increased mid and top end power
2. Revised KIPS system controls exhaust port height
3. New electrofusion cylinder
4. Larger governor bearing on KIPS valve
5. New shorty carburetor moves mainjet and slide closer to cylinder
6. Throttle Responsive Ignition Control (K-TRIC) uses a senser to alter ignition timing according to throttle position
7. Power jet system uses electronic solenoid to close fuel passageway at two separate rpm settings
8. Cast aluminum swingarm section reduces weight and adds strength
9. Shock has low-speed and high-speed compression damping adjusters
10. Aluminum shock components reduce unsprung weight
11. Triple rate shock spring
12. Forks use rubber bladder to minimize aeration-induced damping forces
13. Forks use .43 kg/mm springs
14. Increased internal polishing of forks
15. New fork piston assembly
16. Redesigned front brake caliper
17. Improved dust seals at the rear brake lever and caliper
18. New handlebar bend
Brand: Suzuki
Model: RM250
Suggested retail: $5699
1. Modified exhaust port shape and timing
2. Modification to scavenging ports
3. Reed valve seat is shortened to 8mm
4. A solenoid valve is used to control the exhaust camber breather system based on rpm
5. All new exhaust valve control system (from direct type to L-arm)
6. Piston crown shape changed from a dome to flat shape for improved combustion
7. Keihin PWK38PWJ carburetor with by-pass starter circuit
8. Crankshaft inertia increased by 5% with an increase in primary compression (about 2%) for improved power accessibility and traction control
9. All new pipe to improve low -to-midrange power without a loss to the top end power
10. CDI box located near airbox for better protection
11. Ignition timing is modified for improved power delivery
12. Frame is reinforced for additional strength and improved rear end stability
13. Rigidity improved by 10mm height increase of the forward cast swingarm area
14. Fork spring rate increased from .42 kg/mm to .435 kg/mm
15. Shock compression damper valve and case diameter is increased
16. Shock has larger oil flow route which reduces oil flow resistance
17. Shock spring rate changed from 4.9-5.6-6.5 to 5.0 – 5.4
18. Brake pads changed for better feel
19. Footpeg width increased 6mm to include three row of teeth
20. Rear axle diameter increased from 2omm to 22mm
21. Rear hub is wider and lighter
22. New grips
Brand: KTM
Model: 250SX
Suggested retail: $5748
1. All new cylinder with larger water housing
2. Bore and stroke is changed from 67.5mm by 69.5mm to 72mm by 66.4mm
3. Modified crankshaft
4. Rod shortened from 132mm to 129mm
5. Decreased crankshaft weight by inserting tungsten stuffer
6. Redesigned cases
7. New 38mm Keihin PWK power jet carburetor
8. Carburetor power jet controlled by Kokusan 2K4 ignition system
9. New lighter 43mm WP upside down forks
10. Forks now rebound and compression adjustable on each leg
11. All new triple clamps with bar mounts for four positions
12. Refined no-link PDS rear suspension
13. New round profile swingarm
14. Milled chain adjuster marks make chain adjustment more accurate
15. Footpegs increased in length by 10mm
16. New flower-shaped rear rotors to better transport dirt away from brake pads
17. Rear master cylinder piston reduced from 13mm to 12mm for better modulation
18. Front brake caliper is smaller and lighter
19. Front brake lever has a spring pre-load to eliminate freeplay
20. New Toshiba brake pads increase braking power 10%
21. All new lighter front hub accepts larger front axle (from 17mm to 20mm)
22. Wheel get double-tapered, chrome-plated spokes (4.5mm front/4.5mm rear)
23. Tires are Bridgestones
Brand: Gas Gas
Model: MX250
Suggested retail: $6349
Contact: (816) 741-7615
1. 38mm Kehin PWKS54AOKA carburetor
2. Kokusan Digital CDI
3. Hydraulic actuated clutch
4. 4-speed constant mesh transmission
5. Forged aluminum swingarm
6. 260mm Brembo front disk brake with double piston caliper
7. 220mm Nissin rear brake with Brembo single piston caliper
OPEN MOTOCROSS BIKES
Brand: Kawasaki
Model: KX500
Suggested retail: $5049
1. Unchanged except for graphics
2. Electrofusion cylinder
3. Keihin PWK39 carburetor
4. Five speed transmission
5. UNI-TRAK single shock rear suspension
6. Seat height is 37.4 inches
7. Fuel capacity is 2.6 gallons
Brand: Honda
Model: CR500
Suggested retail: $5599
1. Unchanged except for graphics
2. Eight-pedal reed valve
3. 38mm flat-slide carburetor
4. Five speed transmission
5. Pro-Link Kayaba single shock rear suspension
6. Seat height is 36.9 inches
7. Fuel capacity is 2.4 gallons
Brand: KTM
Model: 380SX
Suggested retail: $N/A
FOUR-STOKE MOTOCROSS BIKES
Brand: Yamaha
Model: YZ426
Suggested retail: $5899
1. All new piston from 92mm bore to 95mm and 1mm larger connecting pin
2. Connection rod is 1mm thick
3. Crankshaft is changed to reduce vibration and improve response
4. All new carburetor with hot engine start added to carb body
5. Float bowl volume increased
6. Slide angle changed
7. Improved access to carb for maintenance
8. Clutch goes from 7 plates to 8 plates
9. Clutch friction plate increased in diameter from 148mm to 155mm
10. Crankcase cover is changed to match larger clutch
11. Gear ratio is changed to improve start line acceleration
12. Radiator is 10mm wider and has 11 core tubes instead of 10
13. Radiator is unpainted
14. Silencer pipe is increased in diameter
15. New steel used in the main frame
16. Head tube is moved back 5mm
17. Aluminum tubing is used for the rear frame
18. Forks use aluminum piston rod to save weight
19. New low friction fork dust seal
20. New low friction outer fork tube
21. Rear shock has separate High-low speed damping adjustment
22. Handlebar mount is moved 10mm forward
23. Front fork clamp width increased 5mm and inside rib is added
24. Clutch lever ratio is changed for a lighter pull and less free play
25. One touch adjustment to clutch lever while riding
26. Front fender is new design
27. Side cover is redesigned to improve air flow to radiator
28. CDI rotor diameter is reduced from 98mm to 83mm.
Brand: Kawasaki
Model: KLX300R
Suggested retail: $4699
1. Not a motocross bike without serious tweaking
2. 292cc liquid-cooled 4-stroke motor
3. Double overhead cam
4. 34mm semi-flat slide CVK carburetor
5. Gear driven engine balancer
6. 6-speed transmission
7. High tensile steel perimeter frame
8. 43mm upside down cartridge forks
9. Uni-trak rear suspension
10. Front and rear disc brakes
Brand: Honda
Model: XR400
Suggested retail: $5299
1. Not a motocross bike without serious tweaking
Brand: VOR
Model: V503
Suggested retail: $7500
Contact: (909) 608-0082
1. Hand-made Italian race bike
2. Five-speed gearbox
3. Forward rotating kickstart
4. Paoli upside down forks
5. 503cc liquid cooled engine
6. Ohlins shock
Brand: KTM
Model: 400SX
Price: $6,298
1. All new model for 2000.
2. Bore and stroke is 89mm by 64mm.
3. Requires the use of 92 Octane pump gas.
4. Has four-speed transmission.
5. Uses the same Keihen MX FCR39 carburetor off the ’99 YZ400.
6. Kokusan DC-CDI ignition black box with throttle position sensor.
7. Tips the scales at 235.8 lbs over 15 pounds little than YZ426.
8. Features same no-link WP PDS shock system as its KTM two-stroke brethren.
9. Excel 1.60″-21 front rim and Excel 2.15″-19 rear rim.
10. Tires are Bridgestone M77 and M78.
11. Four position top triple clamp with Magura 1 1/8″ Pro Taper style bar.
12. Both front (260mm) and rear (220mm) feature the cauliflower rotor design.
13. Steering head angle is 63 degrees.
14. Final drive is 14:50.
15. Wheelbase is 58.3 inches.
16. Seat height is 36.4 inches.
Brand: KTM
Model: 520SX
Price: $6,548
1. All new model for 2000.
2. Bore and stroke is 95mm by 72mm.
3. Requires the use of 92 Octane pump gas.
4. Has sour-speed transmission.
5. Uses the same Keihen MX FCR39 carburetor off the ’99 YZ400.
6. Kokusan DC-CDI ignition black box with throttle position sensor.
7. Tips the scales at 235.8 lbs over 15 pounds little than YZ426.
8. Features same no-link WP PDS shock system as its KTM two-stroke brethren.
9. Excel 1.60″-21 front rim and Excel 2.15″-19 rear rim.
10. Tires are Bridgestone M77 and M78.
11. Four position top triple clamp with Magura 1 1/8″ Pro Taper style bar.
12. Both front (260mm) and rear (220mm) feature the cauliflower rotor design.
13. Steering head angle 63.5 degrees.
14. Final drive is 14:48.
15. Wheelbase is 58.3 inches.
16. Seat height is 36.4 inches.
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