Manual Yamaha XV750 Virago (page 44 of 363) (English)

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Chapter 1 Tune-up and routine maintenance

1-17

14.6 Separate the housing halves and

take the filter element out

14.7a Check the seal between the filter

housing and the frame ...

14.7b ... and the seals inside the filter

housing; replace them if they're

deteriorated or brittle

14.9 Loosen the clamp bolt and remove

the Allen bolts, then detach the air filter

case from the motorcycle

14.10a Remove the cover from the inside

of the case

14.10b Remove the filter element

retaining screw, detach the mounting tab

and lift out the element

1984 and later XV700 through 1100 models

Refer to illustrations 14.9, 14.10a and 14.10b

8 Remove the fuel tank (see Chapter 3).

9 Loosen the air duct clamp bolt and remove the mounting bolts,

then take the air filter case off the motorcycle (see illustration).

10 Remove the air filter case cover (see illustration). Remove the

element mounting screw and take the element out (see illustration).

All models

11 Tap the element on a hard surface to shake out dirt.' If

compressed air is available, use it to clean the element by blowing

from the inside out. If the element is extremely dirty or torn, or if dirt

can't be blown or tapped out, replace it with a new one.

12 Reinstall the filter by reversing the removal procedure. Make sure

the element is seated properly in the filter housing before installing the

cover.

13 Install all components removed for access.

15 Cylinder compression - check

1 Among other things, poor engine performance may be caused by

leaking valves, incorrect valve clearances, a leaking head gasket, or

worn pistons, rings and/or cylinder walls. A cylinder compression

check will help pinpoint these conditions and can also indicate the

presence of excessive carbon deposits in the cylinder heads.

2 The only tools required are a compression gauge and a spark

plug wrench. Depending on the outcome of the initial test, a squirt-

type oil can may also be needed.

3 Start the engine and allow it to reach normal operating

temperature.

4 Support the bike securely so it can't be knocked over during this

procedure.

5 Remove the spark plugs (see Section 16, if necessary). Work

carefully - don't strip the spark plug hole threads and don't burn your

hands.

6 Disable the ignition by unplugging the primary wires from the coils

(see Chapter 4). Be sure to mark the locations of the wires before

detaching them.

7 Install the compression gauge in one of the spark plug holes.

8 Hold or block the throttle wide open.

9 Crank the engine over a minimum of four or five revolutions (or

until the gauge reading stops increasing) and observe the initial

movement of the compression gauge needle as well as the final total

gauge reading. Repeat the procedure for the other cylinder and

compare the results to the value listed in this Chapter's Specifications.

10 If the compression in both cylinders built up quickly and evenly to

the specified amount, you can assume the engine upper end is in

reasonably good mechanical condition. Worn or sticking piston rings

and worn cylinders will produce very little initial movement of the

gauge needle, but compression will tend to build up gradually as the

engine spins over. Valve and valve seat leakage, or head gasket

leakage, is indicated by low initial compression which does not tend to

build up.

11 To further confirm your findings, add a small amount of engine oil

Hi am Gavin from Napier, New Zealand- Does anyone know the correct clearance between the clutch basket bush and the gearbox input shaft on my 1990 Yamaha Virago xv 750 please? Submitted on 12-12-2021 at 00:03
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Yamaha XV750 Virago Manual

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