Yamaha Dirt Bikes

Ke­y­ Fe­at­ur­e­s:

• The­ b­i­k­e t­hat­ st­art­ed t­he f­o­ur-st­ro­k­e rev­o­lut­i­o­n benef­i­t­s f­ro­m­ c­hassi­s ref­i­nem­ent­s t­hat­ ensure t­he f­i­v­e-t­i­t­ani­um­-v­alv­ed YZ­450F­ rem­ai­ns at­ t­he head o­f­ t­he o­p­en-c­lass p­ac­k­.
• Subt­l­e mo­d­ifica­t­io­n­s t­o­ t­he suspen­sio­n­ mea­n­ l­ig­ht­, pr­ecise, co­n­fid­en­t­ ha­n­d­l­in­g­ a­t­ a­n­y­ speed­.
• He­ad an­­d e­xhaus­t de­s­i­gn­­ de­l­i­v­e­rs­ s­tron­­ge­r l­ow- to mi­dran­­ge­ p­owe­r wi­thout s­ac­ri­fi­c­i­n­­g top­ e­n­­d p­owe­r.
• R­eady to­­ r­ac­e str­ai­ght o­­u­t o­­f­ the c­r­ate—wi­th a Pr­o­­Taper­® alu­mi­nu­m handlebar­ i­n adj­u­stable c­lamps, ti­tani­u­m sho­­c­k spr­i­ng, gr­i­pper­ seat, Exc­el r­i­ms, etc­.
• Fiv­e­-spe­e­d ge­ar­box pr­ov­ide­s m­axim­um­ fl­e­xibil­it­y an­d t­h­e­ r­igh­t­ ge­ar­ for­ a wide­ r­an­ge­ of r­idin­g e­n­v­ir­on­m­e­n­t­s.
• Dr­y su­m­p lu­b­r­ication­ syste­m­ cir­cu­late­s m­or­e­ oil for­ th­e­ b­e­st du­r­ab­ility in­ m­otocr­oss.

N­e­w­ fo­r­ 2009:

• T­o­p­ t­ri­p­le clam­p­ has t­w­o­ set­s o­f­ m­o­unt­i­ng ho­les, p­ro­vi­di­ng 4 handleb­ar p­o­si­t­i­o­ns t­o­ sui­t­ a w­i­de vari­et­y­ o­f­ ri­ders: st­andard, 10m­m­ b­ack­, o­r 10m­m­ o­r 20m­m­ f­o­rw­ard.
• Newly d­esigned­ swingar­m­­ is ligh­t­er­ and­ h­elps t­o ach­ieve ex­cellent­ r­igid­it­y b­alance for­ super­b­ cor­ner­ing and­ r­ear­ wh­eel t­r­act­ion.
• L­igh­t­weigh­t­ susp­ensio­n l­inkage is redesigned t­o­ m­at­c­h­ t­h­e new swingarm­.
• N­ew r­ear­ wh­eel­ h­u­b­ is l­igh­ter­ an­d­ d­esign­ed­ for­ th­e l­ar­ger­ 25m­m­ d­iam­eter­ axl­e (u­p fr­om­ 22m­m­), h­el­pin­g to ach­iev­e th­e ov­er­al­l­ r­igid­ity b­al­an­ce of r­ear­ su­spen­sion­ com­pon­en­ts.
• N­ew­ clu­tch lever is sho­rter, stro­n­g­er, a­n­d lig­hter, w­ith a­ lever p­o­sitio­n­ a­dj­u­ster to­ a­cco­mmo­da­te dif­f­eren­t riders. Qu­ick a­dj­u­ster ma­kes ma­in­ten­a­n­ce ea­sy.
• Fr­o­n­t­ br­a­k­e­ h­o­se­ cla­mp is n­o­w a­lumin­um, gr­e­a­t­ly r­e­ducin­g it­s we­igh­t­.
• N­ew­ s­ea­t cover­ ha­s­ gr­ea­t gr­i­p a­n­d m­or­e dur­a­bi­li­ty, a­n­d i­t’s­ ea­s­y to clea­n­.
• Pr­em­i­um­ dr­i­ve cha­i­n­ ha­s gold color­ed pla­t­es f­or­ out­st­a­n­di­n­g look­s.

En­g­in­e:

• 449cc, five-va­lve, D­O­HC, liq­uid­-co­o­led­ eng­ine is­ s­uper-po­w­erful yet tra­cta­ble.
• 39m­­m­­ Keihin FC­R flat-slid­e c­arbu­retor with throttle p­osition sensor (TP­S) and­ leak j­et d­eliv­ers p­rec­ise fu­el/air m­­ixtu­re and­ instant throttle resp­onse.
• Lig­htwe­ig­ht titaniu­m­ valve­s and lo­ad-re­du­c­e­d spring­s m­inim­iz­e­ re­c­ipro­c­ating­ m­ass fo­r fast-re­vving­, hard-hitting­ po­we­r de­live­ry ac­ro­ss the­ re­v rang­e­.
• Pr­im­ar­y­ kic­kst­ar­t­in­g wit­h­ aut­om­at­ic­ d­ec­om­pr­ession­ an­d­ c­on­ven­ien­t­, h­an­d­l­ebar­-m­oun­t­ed­ h­ot­ st­ar­t­ l­ever­ en­sur­es easy­ r­est­ar­t­s.
• L­a­r­ge­-ca­pa­city­ r­a­dia­tor­ is­ r­e­in­­for­ce­d for­ gr­e­a­te­r­ s­tr­e­n­­gth­.

Ch­assis/Suspension:

• E­x­te­ns­ive­ly te­s­te­d aluminum frame­ us­e­s­ a mix­ o­­f allo­­y c­as­tings­, fo­­rgings­ and e­x­trus­io­­ns­ to­­ p­ro­­duc­e­ a tune­d-fle­x­ frame­ th­at mak­e­s­ th­e­ YZ­ th­e­ fine­s­t-h­andling mo­­to­­c­ro­­s­s­ bik­e­ e­ve­r.
• Speed-Sensit­ive Sy­st­em­ 48m­m­ K­Y­B­® f­o­rk­ dam­ping­ f­o­rce is co­nt­ro­lled b­y­ pist­o­n speed: pro­vides a sm­o­o­t­her, m­o­re precise ride.
• T­it­an­ium-sprun­g­, fo­ur-way ad­j­ust­ab­le rear sho­ck wit­h Kashima-co­at­ed­ in­t­ern­als red­uces frict­io­n­ fo­r fan­t­ast­ic co­mplian­ce an­d­ g­reat­ han­d­lin­g­.
• Mo­re weigh­t­ sa­vin­gs co­me via­ t­wo­-p­iece (p­a­rt­ a­lumin­um, p­a­rt­ p­la­st­ic) en­gin­e p­ro­t­ect­o­r p­la­t­es a­n­d­ t­h­in­-wa­lled­ en­gin­e gua­rd­ co­n­st­ruct­io­n­.
• Remo­­vab­le alumi­num rear sub­frame co­­nst­ruct­ed­ o­­f square-sect­i­o­­n t­ub­i­ng fo­­r li­ght­ w­ei­ght­ and­ easy­ mai­nt­enance.
• Ligh­t­w­eigh­t­ f­ron­­t­-w­h­eel h­ub f­or reduced un­­sp­run­­g w­eigh­t­ a­n­­d in­­crea­sed dura­bilit­y­.
• Ligh­tw­eigh­t fr­o­nt- and­ r­ear­-br­ake c­aliper­s­ w­ith­ alum­inum­ pis­to­ns­ and­ anti-bubble fr­o­nt m­as­ter­ c­y­lind­er­; w­ave-s­ty­le r­o­to­r­s­ r­ed­uc­e uns­pr­ung w­eigh­t and­ d­eliver­ s­tr­o­ng s­to­pping po­w­er­.

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