Hard water or salt water is harmful to the engine. You may use distilled water if you can't get soft water.

SUU0440O

NOTE: ______________________________

If you find any leaks, ask a Yamaha dealer to inspect.

j. Reinstall the radiator cap.

k. Run the engine several minutes to recheck

the coolant level in the radiator. If it is low,

add more coolant until it reaches the top

of the radiator. I. Reinstall the stopper bolt, m. Full the reservoir tank with coolant up to

"FULL" level. n. Reinstall the reservoir tank cap and check

for coolant leakage.

o. Reinstall the air scoop and side cover.

H-642

Air filter

1. Remove the side cover.

6-14

2. Remove the air filter case fitting screws and the filter case cover.

3. Side out the guide together with the element.

4. Remove the element from its guide, and clean it with solvent. After cleaning, re­move the remaining solvent by squeezing

the element.

6-15

6.

When installing the element in its case, be sure its sealing surface matches the sealing surface of the case so there is no air leak.

The element should be cleaned at the specified intervals. It should be cleaned more often if the motorcycle is operated in dusty or wet areas.

1 Guide 2 Element

5. Apply recommended oil to the entire sur­face of the filter and squeeze out the ex­cess oil. The element should be wet but not dripping.

U326

The engine should never be run without the air cleaner element; excessive piston and/or cyclinder wear may result.

Recommended oil:

Foam-air-filter oil or SAE 10W30 motor oil

6-16

H-9O0

Carburetor adjustment

The carburetor is a vital part of the engine and requires very sophisticated adjustment. Most adjustments should be left to a Yamaha deal­er who has the professional knowledge and ex­perience to do so. However, the following point may be serviced by the owner as part of this routine maintenance.

U-330

H-901

Idle speed adjustment

1. Start the engine and warm it up for a few
minutes (normally, 1 or 2 minutes) at ap­
proximately 1,000 to 2,000 r/min. Occa­
sionally rev the engine to 4,000 to 5,000
r/min. The engine is warm when it quickly
responds to the throttle.

2. Set the idle to the specified engine speed
by adjusting the throttle stop screw; turn
the screw in to increase engine speed, and
out to decrease engine speed.

The carburetor was set at the Yamaha fac­tory after many tests. If the settings are disturbed, poor engine performance and damage may result.

6-17

1 Throttle stop screw

Standard idle speed: 1,300-1,400 r/min

(J-M5

NOTE:

If the specified idie speed cannot be obtained by performing the above adjustment, consult a Yamaha dealer.

The throttle cable should have a specified free play in the turning direction at the grip flange. If the play is incorrect, take the following steps for adjustment.

Free p!ay: 3-5 mm {0.12-0.20 in)

H903

Throttle cable adjustment

U 064

NOTE:

Before adjusting the throttle cable free play, the engine idling speed should be adjusted.

6-18

a 3-5 mm (0 12-0 20 in}

1. Loosen the lock nut.

2. Turn the adjuster in or out until the ad­
justment is suitable.

3. Tighten the lock nut.

H-203

Spark plug inspection

The spark p!ug is an important engine compo­nent and is easy to inspect. The condition of the spark plug can indicate something of the condition of the engine. The ideal color on the white porcelain insula­tor around the center electrode is a medium to light tan color for a motorcycle that is be­ing ridden normally. Do not attempt to diag­nose any problems yourself. Instead, take the motorcycle to a Yamaha dealer. You should periodically remove and inspect the spark plugs because heat and deposits will cause the spark plugs to slowly break down and erode. If elec­trode erosion becomes excessive, or if carbon and other deposits are excessive, you should replace the spark plugs with a proper type of plug.

6-19

Standard spark plug:

BR8ES {NGK) or BR9ES (NGK)

Before installing the spark plug, measure the electrode gap with a wire thickness gauge and adjust the gap to specification as necessary.

When installing the plug, always clean the gasket surface and use a new gasket. Wipe off any grime from the threads, and torque the spark plug properly.

Spark plug torque:

20 Nm (2.0 m-kg, 14 ft-lb)

Spark plug gap.

0.7-0.8 mm (0.028-

0 031 in)

U038

NOTE: _____________________________

if a torque wrench is not available when you are installing a spark plug, a good estimate of the correct torque is 1 /4 to 1 /2 turns past finger tight. Have the spark plug torqued to the cor­rect value as soon as possible with a torque wrench.

1 Spark plug gap

6-20

H-801

Front brake adjustment

The free play at the end of the front brake lever should be 2-5 mm (0.08-0.20 in).

1 Lock nut 2 Adjuster a 2-5 mm (0 08-0.20 m)

1. Loosen the lock nut.

2. Turn the adjuster so that the brake lever
movement at the lever end is 2 — 5 mm
(0.08-0.20 in) before the adjuster con­
tacts the master cylinder piston.

3. After adjusting, tighten the lock nut.

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