Mikuni TMX 35, TMX 38 Owner's Manual

TNOUBLESHOUIilO AUIDE

Outlined belorv are

the

proper prccedures

br diagnosis and conection of

operating

problems

rclated

to

)@ur

Mikuni TMX

Series Carlcuretor

CHECK

FOR:

WERFIOW

'1.

Worn inlet valve

or

dirty inlet valve seat.

2. lmproperluel le\€l in lloat bor{|.

3. Damaged float

bovl o{ing

gaslct.

4.

Loose

float

bor{|.

POOR IDLIl{G

1. ldle speed improperly adlusted.

2. Clogged bypass.

3. Clogged

pilot

iet.

4.

Loose

pilotjet.

5.

Air leaking

into system.

POOR ACCELERAIION

1. Clogged

pilotiel.

2. Fuel level too loil.

HARO STARTII{G

1.

Choke

not operatino

properly.

2. Generälly

djrty carburelor

3. Loose

carburetor

hose clamp.

4. Fuel ffirflw.

POOR PERFORi'AI{CE

'1.

ldle

sp€ed

improperly adiusted.

2. Fuel

overflw

3. Main

iet

loosened.

4. Air leak

in intake system.

5. 0irty or clogged carburetor or air cleanei:

POOR HIGH

SPEED

PERFORMAI{CE

1.

Loose

main

iet.

2. lmpmper fuel le14l in float chambff

3. Dirt lodged in

strainerin

fuel tank

4.

Clogged

main

jet.

ABN0RitAL C0M8USIt0l{

(FUEL

MTXTURE)

1.

Genenlly dirty carburetor

2. Dirty

orclogged tuel line.

3.

Air leakng

into system.

Loss

0F

P0WER

(LEAi{)

1.

Clogged

luel line.

2. Dirtyfuel tank.

3.

Air leaking into

system.

4.

Clogged

fuel filter in luel tank.

5 Genenlly dirty carburetor

toss

0F

P0WER

(RrcHl

'1.

Dirty

air cleaner element.

2. Throttle

cable notworking.

3. Correct

ietting

lor change 0t altitude operation.

4.

Loose

jets.

REMEDY:

'1.

Replace val\€ or clean valve seat.

2. Adjust floattabs for correcl luel lewl.

3. Relace o-ring

4. Tighten.

'1.

Adiust

idle

speeds.

2. Clean.

3. Clean

iet.

4. Tighten

tet.

5

Tighten manilold

and/or

hose

clamps.

1. Clean.

2. Mjust le1ßl of

float

assembly.

1. Clean orreplacaplungeii

2. Disassemble and clean.

3. Tighten.

4. lnspect

lloat

assembly and inlet ulw

end

adjust

or replace.

'1.

Adiust idle.

2. lnsped float assembly and inlet nh€ and

adiust

or replace.

3.

lnspect main

iet

and tighten.

4. Tighten manilold and/or hose

clamps.

5. Clean.

1. lnsped main

iet

and üOhten.

2. Mjust{loat assembly

for

correcl fuel level.

3. Clean straine[

4. Clean.

1. Disassemble

and clean.

2. Clean fuel

line

or replace.

3. Check mOuntir{.qüts or hose clamps l0r tightness.

1. Clean.

2. Clean.

:

3. Check mounting nuts or hose cllnps I0r tightness.

4. Clean fuel filter

5.

Disassemble

and clean.

1.

Clean or

replace

air cleaner element.

2.

Check throttle cable and adjust or

replace.

3. See tuning.

4.

Tighten

jets.

r$

lit:
!i;l

MIKUNI

AMERICAN CORPORATION

Motorcycle

Carbu

retor Division

8910

Mikuni Averiue, Northridge, CA 91324-3496

USA

WTNODUCTIOIT

MIKUITI

TMXSEß'ES

NACINE

CANBUNEMN

jet

can

easily be accomplished by

unscrewing the float

bowl drain

plug.

A new

float

valve

system

with

independently

moving

floats,

working

in con-

junction

with the

main

jet

enclosed

in

a new baffle

chamber allows the TMX

Carburetor to

perform

smoothly

without hesitation

across

the

roughest

ter-

rain

and under the most

extreme

lean

angles

and cornering forces.

Congratulations

on

your

selection of the Mikuni TMX

Carburetor

for

your

particular

high

performance

application.

We

are

positive

you

will

be ex-

tremely

satisfied with the

performance

gains

and

tuning

ease

we designed

it to

provide.

ALWAYS

RIDE WITH CARE AND

SAFETY BOTH ON AND OFF

THE

RACE TRACK.

Never

ride

without

a helmet,

eye

protection,

and

proper

protective

clothing. Mikuni TMX

Series Carburetors

are legal in California

ONLY FOR

RACING

VEHICLES WHICH

MAY NEVER

BE USED

UPON

A

PUBLIC

SIREET

OR HIGHWAY. ln other states

check for similar laws

which

may apply.

MIKUNI AMERICAN

CORPORATION

Motorcycle Carburetor

Division

8910 Mikuni

Avenue, Northridge,

CA

91324€496 USA

With its intoduction

the

Mikuni TMX

Series

Racing

Carburetor signified a

new

generation

of

high

performance

carburetion

from Mikuni

designed

particularly

for 2-shoke engines in motocross,

off-road

bike and AW

racing

applications.

The TMX Series will also

perform

extremely well in

other ap

plications

including llat track

and

road

racing.

For

4-stroke engine

racing

applications the

TMX

Series

will

also

provide

a significant

performance

im-

provemgnt

over stock carburelion systems although Mikuni recommends

use of

the

RS Series Carburetors

which

were

designed

particularly

for

4-

stroke

application.

An

all

new

design, the

Mikuni TMX

Carburetor

features a radial

flat

slide

design working

in

a smooth bore

venturi

that establishes a new

perform-

ance standard

for

improved throttle

response,

along

with

a wider

and

stronger

overall

powerband

from

the engine.

These

performance gains

are

provided

by

the

radial

flat slide

throttle

valve

design which

produces

a 400/o

greater

boost signal lrom the air flowing

past

it for

better

throttle response

and an increased

sensitivity to tuning. Very minimum tuning

changes are

able

to

produce

noticeable results

in engine

performance.

The TMXCarburetoris

designed with a

new

lightweightand

more compact

body design with

easy

maintenance

and tuning

features.

The

carburetor's

jet

needle

position

may be changed easily

and

quickly.

Access

to the main

2