2007 YAMAHA BLASTER 200 Owners Manual

8-14
1
2
3
4
5
6
78
9
10
11

13. Install the air filter case cover by installing the
screws.
14. Install the seat.
NOTE:

The air filter element should be cleaned every 20–
40 hours. It should be cleaned and lubricated more
often if the ATV is operated in extremely dusty ar-
eas. Each time the air filter element maintenance
is performed, check the air inlet of the air filter case
for obstructions. Check the air filter case rubber
joint to the carburetor fittings and the rubber joint
manifold fittings for an air-tight seal. Tighten all fit-tings securely to avoid the possibility of unfiltered
air entering the engine.
CAUTION:

ECB00460

Make sure that the air filter element is prop-
erly seated in the air filter case.

Never operate the engine with the air filter el-
ement removed. This will allow unfiltered air
to enter the engine, causing rapid engine
wear and possible engine damage. Addition-
ally, operation without the air filter element
will affect carburetor jetting with subsequent
poor performance and possible engine over-
heating.
EBU28310
Cleaning the spark arrester
Be sure the exhaust pipe and muffler are cool be-
fore cleaning the spark arrester.
1. Remove the screws.
1. Washer
1

8-15
1
2
3
4
5
6
78
9
10
11

2. Remove the tailpipe by pulling it out of the
muffler.
3. Tap the tailpipe lightly, and then use a wire
brush to remove any carbon deposits from the
spark arrester portion of the tailpipe and inside
of the tailpipe housing.4. Make sure the gasket is properly positioned,
then insert the tailpipe into the muffler and
align the screw holes.
5. Install the screws and tighten them.
WARNING
EWB02340
Do not start the engine when cleaning the
spark arrester, otherwise it could cause injury
to the eyes, burns, carbon monoxide poison-
ing, possibly leading to death, and start a fire.
Always let the exhaust system cool prior to
1. Screw
1

1. Tailpipe
2. Spark arrester
3. Gasket
1
2
3

8-16
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2
3
4
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6
78
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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

8-17
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2
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4
5
6
78
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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

8-18
1
2
3
4
5
6
78
9
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11

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
3
1

8-19
1
2
3
4
5
6
78
9
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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

8-20
1
2
3
4
5
6
78
9
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11

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

8-21
1
2
3
4
5
6
78
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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
12
3