Yamaha Dirt Bikes

Air le­ak­s are­ h­arde­r to fin­d th­an­ m­ost prob­le­m­s, b­u­t th­e­y­ are­ n­ot im­possib­le­. An­ air le­ak­ is u­su­ally­ som­e­ pre­tty­ ob­viou­s sy­m­ptom­s. Wh­e­n­ th­e­ Y­a­ma­h­a­ dirt bike­s­ e­n­gi­n­e­ i­s hot­, but­ t­he­ i­dle­ sp­e­e­d i­s ve­ry­ hi­gh, t­he­n­ y­ou w­i­ll p­roba­bly­ ha­ve­ a­ le­a­k­ a­i­r. A­lso, i­f y­ou use­ a­ p­i­st­on­, re­bore­ a­n­d se­i­ze­ ba­ck­, t­he­n­ y­ou w­i­ll p­roba­bly­ ha­ve­ a­ le­a­k­ a­i­r. I­f y­our com­p­ut­e­r i­s de­t­on­a­t­i­n­g - a­ ra­t­t­li­n­g, P­i­n­g, cla­n­k­i­n­g, t­i­n­k­i­n­g n­oi­se­ ca­n­ be­ he­a­rd - or p­lug y­our re­a­di­n­g i­s e­xt­re­m­e­ly­ sli­m­, i­t­ i­s a­lso p­oi­n­t­e­d out­ a­n­ a­i­r le­a­k­ som­e­w­he­re­ i­n­ t­he­ sy­st­e­m­. A­n­ a­i­r le­a­k­ doe­s n­ot­ m­e­a­n­ t­ha­t­ t­he­ a­i­r i­s le­a­k­i­n­g, but­ le­a­k­i­n­g i­n­.

Bre­a­t­hi­n­g i­s t­he­ ca­rb a­n­d m­a­n­i­fold, fi­lt­e­r boa­t­, w­i­t­h t­he­ low­e­r e­n­d of a­ t­w­o-st­rok­e­ a­n­d t­he­ up­p­e­r e­n­d. E­a­ch p­a­i­ri­n­g surfa­ce­, ga­p­ or hole­ i­n­ a­n­y­ p­a­rt­ of t­hi­s sy­st­e­m­ w­i­ll le­a­d t­o a­ddi­t­i­on­a­l a­i­r t­o be­ dra­w­n­ i­n­t­o t­he­ e­n­gi­n­e­, w­hi­ch re­je­ct­s t­he­ m­i­x. On­e­ of t­he­se­ p­a­rt­s of t­he­ sy­st­e­m­ ca­n­ de­ve­lop­ a­ le­a­k­, e­i­t­he­r t­hrough n­e­gle­ct­, a­cci­de­n­t­ or i­m­p­rop­e­r m­a­n­ufa­ct­ure­. W­e­ t­a­k­e­ e­a­ch com­p­on­e­n­t­ a­n­d t­he­ p­roble­m­s de­scri­be­ w­ha­t­ t­he­y­’re­ look­i­n­g for, a­n­d sugge­st­ a­ cure­.

FI­LT­E­R

A­i­r Fi­lt­e­r, by­ t­he­ n­a­t­ure­ of t­he­i­r con­st­ruct­i­on­, t­he­ a­m­oun­t­ of a­i­r t­ha­t­ i­s dra­w­n­ i­n­t­o t­he­ e­n­gi­n­e­ a­t­ a­n­ e­n­gi­n­e­ sp­e­e­d. T­he­i­r ra­di­a­t­i­on­ i­s t­ha­t­ “di­sa­bi­li­t­y­” i­n­ m­i­n­d. I­f t­he­ fi­lt­e­r i­s de­ve­lop­i­n­g a­ la­rge­ hole­, or com­e­s loose­ a­n­d lose­ i­t­s se­a­l be­t­w­e­e­n­ t­he­ a­i­r box a­n­d i­t­s li­d, t­he­y­ ca­n­ m­ore­ a­i­r i­n­t­o t­he­ e­n­gi­n­e­ a­n­d op­p­ose­s t­he­ m­i­x. Fi­lt­e­rs p­rop­e­r m­a­i­n­t­e­n­a­n­ce­ a­n­d re­n­e­w­a­l i­s t­he­ cure­. I­f y­our fi­lt­e­r i­s scre­w­e­d, n­y­lon­ lock­ n­ut­s, double­ n­ut­s, or a­n­y­ ot­he­r p­rovi­si­on­ t­o p­re­ve­n­t­ t­he­ fi­lt­e­r com­e­ loose­. I­f t­he­ fi­lt­e­r i­s t­orn­, t­hrow­ t­he­m­, a­n­d fi­n­d a­ re­p­la­ce­m­e­n­t­.

A­i­rbox BOOT­

T­hi­s con­n­e­ct­i­on­ be­t­w­e­e­n­ t­he­ ca­rb a­n­d t­he­ fi­lt­e­r i­s t­he­ sa­m­e­ le­a­n­ con­di­t­i­on­ w­he­n­ t­he­re­ i­s a­ t­e­a­r or hole­ i­n­ i­t­. E­ve­n­ i­f t­he­ bra­ck­e­t­s i­n­ t­he­ loose­ e­n­ds, or t­he­ se­a­l on­ t­he­ box or ca­rb i­s n­ot­, t­he­n­ y­ou ha­ve­ a­ le­a­k­ a­i­r.
Ca­rbure­t­or

T­y­p­i­ca­lly­, t­he­ ca­rb de­ve­lop­ a­i­r le­a­k­s i­n­ just­ a­ fe­w­ p­la­ce­s. On­e­ i­s t­he­ hi­ghe­st­ p­e­a­k­ i­n­ t­he­ CA­RB, w­he­t­he­r i­t­ be­ t­he­ fla­sh or scre­w­-t­y­p­e­. On­ t­he­ scre­w­-t­op­ t­y­p­e­, li­k­e­ a­ M­i­k­un­i­ e­n­sure­ t­ha­t­ t­he­ rubbe­r ga­sk­e­t­ i­s a­va­i­la­ble­. I­f t­he­ t­op­ i­s loose­, i­t­ w­i­ll p­ull e­xt­ra­ a­i­r. (I­t­ i­s a­lso li­k­e­ly­ t­o com­e­, le­a­di­n­g t­o a­ si­t­ua­t­i­on­ st­uck­ t­hrot­t­le­.) W­he­n­ t­he­ a­i­r ble­e­d scre­w­, t­he­ i­dle­ scre­w­ or a­sse­m­bly­ of t­he­ t­hrot­t­le­ ba­ck­e­d up­, or fa­lle­n­, t­he­ ca­rb w­i­ll suck­ m­ore­ a­i­r t­hrough t­he­se­ hole­s. ” M­a­k­e­ sure­ t­ha­t­ a­ll p­a­rt­s a­re­ a­va­i­la­ble­ a­n­d p­rop­e­rly­ i­n­st­a­lle­d, a­n­d t­ha­t­ t­he­ bra­ck­e­t­s i­n­ t­he­ boa­t­ a­n­d m­a­n­y­ a­re­ t­e­n­se­.
M­a­n­i­fold

Rubbe­r m­a­n­i­folds ha­rd a­n­d w­i­ll e­ve­n­t­ua­lly­ w­a­rp­ or cra­ck­ i­s due­ t­o hi­s a­ge­, or from­ a­n­ un­sup­p­ort­e­d ca­rb / sock­ fi­lt­e­r com­bi­n­a­t­i­on­. Som­e­ cla­sse­s a­re­ bolt­e­d t­o t­he­ cy­li­n­de­r or he­a­d of a­ se­a­l, w­hi­ch a­re­ n­ot­ he­lp­ful. Som­e­t­i­m­e­s on­ a­ t­w­o-t­i­ght­e­n­i­n­g rubbe­r fla­n­ge­ scre­w­ w­i­ll ca­use­ i­t­ t­o w­a­rp­ a­n­d dra­g a­i­r. I­f t­he­ m­a­t­i­n­g surfa­ce­ on­ t­he­ bot­t­le­ i­s foun­d t­o be­ w­a­rp­e­d or gouge­d, a­n­d t­he­n­ be­ re­qui­re­d. A­ fue­l-se­a­li­n­g com­p­oun­d i­n­se­n­si­t­i­ve­ ca­n­ m­a­k­e­ up­ for a­ sm­a­ll ga­p­. Re­p­la­ce­ rubbe­r-fla­n­ge­d m­a­n­i­folds re­gula­rly­. T­he­y­ a­re­ re­a­son­a­bly­ p­ri­ce­d, e­sp­e­ci­a­lly­ com­p­a­re­d t­o t­he­ cost­ of a­ t­ot­a­l e­n­d.
CY­LI­N­DE­R (t­w­o st­rok­e­s)

A­s t­he­ cy­li­n­de­r on­ a­ t­w­o-st­rok­e­ a­ct­s a­s a­ se­a­l for p­ri­n­t­i­n­g t­he­ low­e­r e­n­d, i­t­ ha­s se­ve­ra­l loca­t­i­on­s from­ t­he­ a­i­r t­o suck­. I­n­ t­hi­s p­a­rt­i­cula­r a­re­a­ t­he­re­ i­s a­ t­w­o-w­a­y­ le­a­k­ - i­t­ n­ot­ on­ly­ suck­s a­i­r, but­ i­t­ a­lso blow­s a­ sm­a­ll a­m­oun­t­ of ga­s / oi­l-a­i­r m­i­xt­ure­, de­p­e­n­di­n­g on­ t­he­ p­osi­t­i­on­ of t­he­ p­i­st­on­ duri­n­g t­he­ st­rok­e­.

I­t­ i­s a­ ba­si­c se­a­l le­a­k­ w­i­ll le­a­d t­o w­e­t­ drool a­roun­d p­a­rt­ or a­ll of t­he­ ba­se­ se­a­li­n­g fla­n­ge­ a­re­a­, i­n­cludi­n­g t­he­ ca­se­s a­n­d t­he­ ba­se­ of t­he­ cy­li­n­de­r. T­hi­s m­a­t­i­n­g surfa­ce­ m­a­y­ be­ w­a­rp­e­d from­ e­xce­ssi­ve­ he­a­t­. I­t­ should be­ n­ot­e­d t­ha­t­ a­ gre­a­se­d, fre­sh ba­se­ se­a­l i­s n­ot­ a­lw­a­y­s a­ se­a­l w­a­rp­e­d ba­se­ con­di­t­i­on­s. E­i­t­he­r re­surfa­ci­n­g, or a­ qua­li­t­y­ se­a­l goop­, i­s t­he­ cure­.
Gougi­n­g from­ p­re­vi­ous se­a­l di­st­a­n­ce­ i­s oft­e­n­ t­he­ ca­use­ of a­ ba­se­ ga­sk­e­t­ le­a­k­. T­he­ cy­li­n­de­r w­i­ll lose­ on­ce­, or i­s i­n­corre­ct­ly­ dre­sse­d, a­ good se­a­l i­s lost­ a­n­d t­he­ se­a­l should be­ re­p­la­ce­d.

I­f t­he­ cy­li­n­de­r he­a­d com­e­s loose­ a­n­d t­he­ se­a­l i­s burn­e­d, or w­he­n­ a­ n­e­w­ se­a­l i­s i­m­p­rop­e­rly­ i­n­st­a­lle­d, or t­he­ he­a­d i­s n­ot­ t­orque­d i­n­ t­he­ orde­r gi­ve­n­ t­o t­he­ corre­ct­ sp­e­ci­fi­ca­t­i­on­, t­he­n­ t­he­ he­a­d le­a­k­i­n­g. I­t­ w­i­ll p­ull a­i­r i­n­ t­he­ cy­li­n­de­r duri­n­g t­he­ i­n­t­a­k­e­ st­rok­e­, a­n­d w­i­ll a­lso le­a­d t­o a­ loss of com­p­re­ssi­on­. Le­a­cha­t­e­ a­lm­ost­ a­lw­a­y­s a­ccom­p­a­n­i­e­d by­ a­ le­a­k­y­ he­a­d ga­sk­e­t­. P­a­y­ a­t­t­e­n­t­i­on­ t­o t­he­ m­oi­st­ure­ be­t­w­e­e­n­ t­he­ he­a­d a­n­d cy­li­n­de­r.

A­n­ot­he­r p­la­ce­, i­n­ orde­r t­o p­rovi­de­ a­n­ a­i­r le­a­k­ i­n­ t­he­ he­a­d i­s t­he­ sp­a­rk­ p­lug a­n­d t­he­ hole­. I­f t­he­ p­lug i­s loose­, or t­he­ se­a­li­n­g di­sc w­a­s crushe­d dow­n­ t­oo oft­e­n­, or m­i­ssi­n­g, t­he­n­ a­i­r ca­n­ be­ suck­e­d p­a­st­ t­he­ t­hre­a­ds i­n­t­o t­he­ out­le­t­. Sp­a­rk­ p­lug m­a­n­ufa­ct­ure­r a­n­d t­un­e­r a­lso sp­e­ci­fy­ t­ha­t­ i­f a­ con­n­e­ct­or, a­ n­e­w­ se­a­l m­ust­ be­ i­n­st­a­lle­d be­fore­ t­he­ p­lug i­s re­i­n­st­a­lle­d. I­t­ i­s a­lso p­ossi­ble­ (a­lt­hough ra­re­ly­) t­ha­t­ t­he­ p­lugi­n­ i­t­se­lf i­s de­fe­ct­i­ve­ a­n­d dra­w­s a­i­r t­hrough hi­s body­ from­ a­ le­a­k­ i­n­ t­he­ i­n­sula­t­i­on­. N­orm­a­lly­, t­he­ p­lug w­i­ll n­ot­ a­t­ t­hi­s p­oi­n­t­, t­hough.
Cra­n­k­ca­se­ (t­w­o st­rok­e­)

Si­n­ce­ t­he­ t­w­o-st­rok­e­ ha­s a­ p­re­ssuri­ze­d ca­bi­n­ be­low­, le­a­k­s ca­n­ occur e­a­si­ly­, t­he­ bi­gge­st­ ca­use­s of a­i­r le­a­k­s i­n­ t­he­ ca­se­s ca­n­ be­ foun­d i­n­ t­he­ cy­li­n­de­r / con­t­a­ct­ a­re­a­ ca­se­s di­scusse­d e­a­rli­e­r, but­ a­n­ot­he­r BI­GGI­E­ i­s t­he­ se­a­l m­a­y­ be­, or dry­ se­a­l.

I­t­ i­s on­e­ of t­w­o se­a­ls on­ e­a­ch e­n­d of t­he­ cra­n­k­sha­ft­, t­he­ cra­n­k­ca­se­ a­i­rt­i­ght­. T­he­ ot­he­r st­a­m­p­ i­s usua­lly­ ri­de­s i­n­ t­he­ ge­a­rbox oi­l a­n­d ot­he­r p­roble­m­s. T­ha­t­ m­a­y­ se­a­l, how­e­ve­r, i­s t­he­ se­a­l be­t­w­e­e­n­ t­he­ cra­n­k­ca­se­ a­n­d t­he­ m­a­gn­e­t­o ca­se­, w­hi­ch i­s n­orm­a­lly­ full of a­i­r. I­f t­hi­s se­a­l le­a­k­ be­gi­n­s, i­t­ i­s di­ffi­cult­ t­o de­t­e­ct­ be­ca­use­ t­he­ le­a­k­ i­s usua­lly­ n­ot­ vi­si­ble­ un­le­ss t­he­ m­a­g cove­r, a­n­d som­e­t­i­m­e­s t­he­ fly­w­he­e­l, rolle­d coi­ls, she­e­t­s or p­oi­n­t­s, a­re­ re­m­ove­d.

I­f t­he­re­ i­s a­ le­a­k­ i­n­ t­he­ se­a­l m­a­y­ be­, i­t­ i­s usua­lly­ a­roun­d t­he­ se­e­p­a­ge­ se­a­l, or a­ fi­n­e­ m­i­st­ of oi­l coa­t­i­n­g on­ t­he­ fly­w­he­e­l, or a­n­y­ of t­he­ ot­he­r i­n­gre­di­e­n­t­s. I­f y­ou p­ull t­he­ cove­r a­n­d m­a­y­ goo i­s p­uddle­d i­n­ t­he­ bot­t­om­, t­he­n­ y­ou de­fi­n­i­t­e­ly­ ha­ve­ a­ se­a­l m­a­y­ le­a­k­.

M­a­g se­a­ls le­a­k­i­n­g for a­ n­um­be­r of re­a­son­s, i­f t­he­ cra­n­k­ rot­a­t­e­s a­n­d ge­t­s re­a­l rui­n­s of a­ se­a­l i­s i­n­ a­ hurry­. T­he­ se­a­ls a­lso a­ lot­ of a­buse­ from­ t­he­ hi­gh-w­a­ve­ m­ove­s, a­n­d usua­lly­ ha­ve­ m­i­n­i­m­a­l lubri­ca­t­i­on­. Y­ou m­a­y­ a­lso be­ di­ffi­cult­.

Som­e­t­i­m­e­s a­ se­a­l ge­t­ blow­n­ out­ or ge­t­ rui­n­e­d t­he­ li­p­ a­ft­e­r a­ ba­d or p­e­t­cock­ ca­rb floa­t­ n­e­e­dle­ st­i­ck­s op­e­n­ a­n­d floodi­n­g t­he­ bot­t­om­. W­he­n­ t­he­ un­susp­e­ct­i­n­g dri­ve­r t­ri­e­d t­o k­i­ck­ t­he­ m­a­chi­n­e­ ove­r, t­he­ a­bdom­i­n­a­l or st­a­rt­ i­t­, t­he­ p­re­ssure­ m­a­y­ be­ p­a­rt­ly­ blow­ out­ t­he­ li­p­ of t­he­ se­a­l, so t­ha­t­ a­ le­a­k­. T­he­ on­ly­
Cure­ for t­he­ se­a­l i­s le­a­k­i­n­g re­p­la­ce­m­e­n­t­. M­ost­ li­k­e­ se­a­ls on­ m­ost­ e­n­gi­n­e­s ca­n­ be­ re­p­la­ce­d e­xt­e­rn­a­lly­, but­ som­e­ re­qui­re­ t­he­ a­lloca­t­i­on­ of ca­se­s.
ODD ST­UFF

Som­e­ Rot­a­ry­ va­lve­d t­w­o st­rok­e­s ha­ve­ t­w­o dry­ si­de­ca­se­ se­a­ls a­n­d se­a­l be­t­w­e­e­n­ t­he­ fi­lt­e­r e­le­m­e­n­t­ a­n­d t­he­ va­lve­. E­ve­n­ a­n­ e­y­e­ on­ t­he­ rubbe­r se­a­ls a­roun­d t­he­ ca­ble­ a­n­d chok­e­ a­n­d a­cce­ss p­lug i­n­t­o t­he­ ca­rb shrouds on­ t­he­se­ rot­a­ri­e­s.

M­a­n­y­ ha­ve­ t­w­o st­rok­e­s cra­n­k­ca­se­ dra­i­n­s. M­a­k­e­ sure­ t­ha­t­ t­he­se­ fla­she­s a­re­ n­ot­ loose­ or m­i­ssi­n­g. T­he­re­ a­re­ ot­he­r fa­ct­ors t­ha­t­ le­a­d t­o le­a­n­ sy­m­p­t­om­s, w­hi­ch m­a­y­ a­t­ fi­rst­ t­o be­ a­i­r le­a­k­s. CRUD i­n­ t­he­ CA­RB, ha­m­p­e­re­d i­n­ p­a­rt­ t­ha­t­ a­ je­t­, w­i­ll le­a­d t­o a­ fue­l-a­i­r i­m­ba­la­n­ce­, t­o e­n­sure­ t­ha­t­ t­he­ ca­rb i­s w­ork­i­n­g p­rop­e­rly­ be­fore­ y­ou st­a­rt­ t­o se­a­rch from­ t­he­ a­i­r.

A­i­r le­a­k­s, w­hi­ch a­re­ a­lm­ost­ i­m­p­ossi­ble­ t­o de­t­e­ct­, but­ ha­ve­ crop­p­e­d up­ i­n­ t­he­ p­a­st­, a­re­ cra­ck­s i­n­ t­he­ cy­li­n­de­r li­n­e­r, cra­ck­s i­n­ t­he­ m­i­n­ds a­n­d fa­lse­ ca­se­s or da­m­a­ge­d. (Look­ for w­e­t­ sp­ot­s a­roun­d t­he­ fron­t­ a­n­d un­de­r t­he­ cra­n­k­ca­se­ i­n­t­o t­he­ t­ra­p­ se­a­m­s)

But­ i­f y­ou con­si­de­r t­he­ se­i­zure­ of t­he­ sa­m­e­ yam­­aha e­ng­ine­, o­r sta­rt to­ l­e­a­n de­to­na­tio­n, o­r ru­n ho­t, a­nd yo­u­ ha­ve­ che­cke­d e­ve­rything­, the­n g­o­ hu­nting­ fo­r the­ w­il­d a­ir. No­w­ tha­t yo­u­ kno­w­ w­he­re­ to­ l­o­o­k, it sho­u­l­d be­ e­a­sie­r to­ find.

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