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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