YAMAHA BLASTER 200 2007 Owners Manual

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touching exhaust components.
EBU23971
Changing the carburetor settings
In extremely cold weather, it is necessary to
change the carburetor settings to maintain opti-
mum engine performance and to prevent engine
damage.
WARNING

EWB02000

Improperly servicing or adjusting the carbu-
retor could cause it to malfunction with the
possibility of an accident, or the carburetor
could leak fuel, which would be a fire hazard.

Carburetor adjustments should only be per-
formed by a Yamaha dealer. Do not attempt
to perform these procedures unless you
have mechanical knowledge and the neces-
sary tools.

Do not perform this procedure while the en-
gine is hot. Place a rag under the carburetor
to catch any fuel. Wipe up any spilled fuel
completely.

After servicing the carburetor, always check
the throttle lever operation before operating
the ATV to make sure it is working correctly.
Standard settings

Main jet #230
Jet needle clip position 2nd groove
Pilot air screw 1 1/2 turns out
1. Main jet number
1

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Carburetor setting chart
Changing the carburetor settings
Disassembling the carburetor
1. Turn the fuel cock to the “OFF” position.2. Loosen the carburetor float bowl drain screw
and drain the fuel.
3. Disconnect the fuel hose and the oil hose.

1. Standard position: Groove 2
Temperature Main jet Jet needlePilot air
screw

Above 0°C (32°F)
(standard)#230 2nd groove1 1/2
turns out
+5°C (41°F) –
-15°C (5°F)#230 2nd groove1 1/2
turns out
-10°C (14°F) –
-30°C (-22°F)#240 3rd groove1 1/2
turns out
1
1. Carburetor float bowl drain screw
1

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4. Loosen the clamp screw on each side of the
carburetor, and then remove the carburetor.
5. Remove the securing plate by removing the
screw.
6. Remove the mixing chamber cap by unscrew-
ing it.7. Disconnect the throttle cable from the throttle
valve by removing the holder screws and
holder.
1. Fuel hose
2. Oil hose
1
2

1. Clamp screw
2. Mixing chamber cap securing plate
3. Screw
4. Mixing chamber cap
14
2
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1

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8. Remove the float chamber by removing the
screws.
1. Mixing chamber cap
2. Throttle valve
3. Throttle cable holder
4. Screw
5. Throttle cable
2 5
4
31
4

1. Float chamber
2. Screw22
1
2

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9. Remove the float by removing the pin.
10. Remove the needle valve by unhooking it
from the float arm.
11. Change the main jet and the jet needle clip po-
sition.
NOTE:

An optional main jet can be obtained at a Yamaha
dealer.Assembling the carburetor
1. Install the needle valve by hooking it onto the
float arm.
2. Install the float by inserting the pin into the
holder.
3. Install the float chamber by installing the
screws.
4. Connect the throttle cable onto the throttle
valve by installing the holder and the screws.
5. Install the mixing chamber cap and tighten it.
6. Install the securing plate by installing the
screw.NOTE:

When installing the securing plate, align the slot in
the securing plate with a projection on the carbure-
tor mixing chamber cap.
1. Float
2. Float pin
3. Needle valve
4. Float arm
5. Main jet
1
2 3 45

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7. Install the carburetor and tighten the clamp
screws.
8. Connect the fuel hose and the oil hose.
9. Tighten the carburetor float bowl drain screw.
EBU24000
Adjusting the engine idling speed
The engine idling speed must be checked and, if
necessary, adjusted as follows at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
NOTE:

A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
NOTE:

The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
it, turn the screw in direction (b).
1. Screw
2. Projection
3. Slot
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NOTE:

If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
EBU24043
Adjusting the throttle cable free play
The throttle cable free play should be checked
and, if necessary, adjusted at the intervals speci-
fied in the periodic maintenance and lubricationchart.
The throttle cable free play should measure 4.0–
6.0 mm (0.16–0.24 in) at the throttle lever. Period-
ically check the throttle cable free play and, if nec-
essary, adjust it as follows.
NOTE:

The engine idling speed must be checked, and ad-
justed if necessary, before adjusting the throttle ca-
ble free play.
1. Loosen the locknut.
2. To increase the throttle cable free play, turn
the adjusting bolt in direction (a). To decrease
the throttle cable free play, turn the adjusting
bolt in direction (b).
1. Throttle stop screw
Engine idling speed:
1450–1550 r/min
1 (b)(a)

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3. Tighten the locknut.
EBU24130
Checking the front and rear brake pads
The front and rear brake pads must be checked for
wear at the intervals specified in the periodic main-
tenance and lubrication chart.
EBU24161
Front brake pads
Check each front brake pad for damage and mea-
sure the lining thickness. If a brake pad is dam-aged or if the lining thickness is less than 1.0 mm
(0.04 in), have a Yamaha dealer replace the brake
pads as a set.
EBU24190
Rear brake pads
Each brake pad is provided with a wear indicator,
which allows you to check the brake pad wear
without having to disassemble the brake. To check
the brake pad wear, check the position of the wear
indicator while applying the brake. If a brake pad
has worn to the point that the wear indicator almost
touches the brake disc, have a Yamaha dealer re-
place the brake pads as a set.
1. Throttle lever free play adjusting bolt
2. Locknut
3. Throttle lever free play
1
2
3

1. Lining thickness
1

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EBU24251
Checking the brake fluid level
Insufficient brake fluid may allow air to enter the
brake system, possibly causing it to become inef-
fective.
Before riding, check that the brake fluid is above
the minimum level mark and replenish if neces-
sary. A low brake fluid level may indicate worn
brake pads and/or brake system leakage. If the
brake fluid level is low, be sure to check the brake
pads for wear and the brake system for leakage.
Front brake
1. Wear indicator
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1. Minimum level mark
LOWER
1

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Rear brake

Observe these precautions:

When checking the fluid level, make sure that
the top of the brake fluid reservoir is level.

Use only the recommended quality brake fluid,
otherwise the rubber seals may deteriorate,
causing leakage and poor braking performance.

Refill with the same type of brake fluid. Mixing
fluids may result in a harmful chemical reaction
and lead to poor braking performance.

Be careful that water does not enter the brake
fluid reservoir when refilling. Water will signifi-
cantly lower the boiling point of the fluid and may
result in vapor lock.

Brake fluid may deteriorate painted surfaces or
plastic parts. Always clean up spilled fluid imme-
diately.

As the brake pads wear, it is normal for the brake
fluid level to gradually go down. However, if the
brake fluid level goes down suddenly, have a
Yamaha dealer check the cause.
EBU24290
Changing the brake fluid
Have a Yamaha dealer change the brake fluid at
the intervals specified in the NOTE after the peri-
odic maintenance and lubrication chart. In addi-
tion, have the oil seals of the master cylinders and
calipers as well as the brake hoses replaced at the
intervals listed below or whenever they are dam-
aged or leaking.

Oil seals: Replace every two years.

Brake hoses: Replace every four years.
EBU24390
Checking the front brake lever free play
The brake lever free play must be checked at the
1. Minimum level mark
Recommended brake fluid:
DOT 4
LOWER
1