Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/128631
640LC4 f}Jua[Sport MODEL CHANGE CLAIMED RESULT CRANKSHAFT 125 SX All Four-Stroke models Ughter/new 54.5 stroke ratio Casehardened material "Quicker revving, faster acce leration." "Elim inates stop disc, improves main-bearing life: Newly designed main exhaust port, additional exhaust passages New combustion chamber shape CYUNDER /CYUNDER HEAD 250 SX, E/XC 250 SX 300 E/XC 300 E/XC 300 E/XC 125SX Cylinder holds 8% more wat er New casting procedures New porting specs "Better performance through the enti re rpm range: " Crisper throttle response : "Match looks of the 250cc cy linder: "Optimum operating temperature: "Im proves minimizing production variances." "To accept new bore and stroke: PISTON 250 SX 125 SX 520 SX. E/XC Lighter piston .5m m m ore under square Wider piston skirt " Gives moto r crisp throttle response and agile feel: "Prod uces better maximum output: "A dded durability and longer piston li fe: RADIATOR All Four-Strok e Mod els Additional cool ing fin "Im pro ves heat dissipation: New Kokusan 2K3 igniti on w/l 06mm fiyw heel N ew ignition curve "Im proves pow er outp ut for enduro riding." "Com pliments m od ified exhaust and cy linder ENGINE CASES All Ignition, con trol and cl utch cover powd er -coat ed "Keep motor look ing new: INTAKE FLAN GE A ll E/ XC mod els Incorp orate SX flange "More engin e respons e: CLUTCH All Four -Stroke Models Clu tch -wheel bearing constructed of casehardened ma terial "Increased bearing life: Six-speed transmission Revised gear rati os "Im proves shifting , narrows steps between gears." "Increases power deliv ery for mo tocross raci ng ." SHIFT LEVER A ll m odels 12mm longer, 6mm furt her out "Easier shifting." FUEL TANK SX models SX mod els Narrower Clear fuel cell "Improved rider maneuverabili ty." "Easier to check fuel level. " RADIATOR SHROUDS SX m odels E/X C Redesigned Reshaped "Improved rider m ob ili ty : "Im prove airflow for better eng ine cooling : FORK All SX E/XC WP 43 USD MA (Multi -Adj uster) , new settings Stiffer, hig her-compression More sensiti ve sett ings "Optima l suspension perform ance: "Bette r suited for motocross: "M ore progr essive at beginn ing of strok e: SHOCK All WP PDS. new setti ngs ' Similar to fork." HAN DLEBA R Al l Tw o-Strok es Tap ered Magura "Same as Four-Strokes, more durable: FRONT BRAKE LEVER A ll mod els Shorter, new offset "Improved feel. " REAR BRAKE All models New brake caliper. smaller piston (w/sintered H38 pads) "More prog ressive feel." SWINGARM All m odels O ne-piece construction "Elimi nates welds. " IGNITIO N All E/XC m odels 250 SX, E/XC TRANSMISSION 400 SX 520SX New exterior design cue I e n e _ S • S EPTEMBER 20. 2000 23