Manual Yamaha XV750 Virago (page 49 of 363) (English)

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Chapter 1 Tune-up and routine maintenance

18.14 The single line on the edge of the

alternator rotor is the top dead center

mark for the front cylinder

18.22 Lift off the rocker cover

18.23 Remove the crankcase outer cover

18.24a The timing mark for the rear cylinder is the line next to the

"T" on the alternator rotor; align it with the pointer inside the hole

18.24b XV700 through 1100 timing marks

1 Rear cylinder top dead center mark

2 Front cylinder top dead center mark

3 Rear cylinder firing range mark

you should feel a slight drag. If there's no drag, the clearance is too

loose. If there's a heavy drag, the clearance is too tight.

12 To adjust the clearance, loosen the rocker arm locknut with a box

wrench (ring spanner) (see illustration 18.11). Turn the adjusting

screw with a screwdriver or Allen wrench to change the clearance,

then tighten the locknut.

13 Recheck the clearance with the feeler gauge to make sure it didn't

change when you tightened the locknut. Readjust it if necessary.

14 Turn the engine clockwise to align the front cylinder's timing mark

with the notch in the timing window (see illustration 18.9b and the

accompanying illustration). With the timing mark aligned, wiggle the

front cylinder's rocker arms. There should be a slight amount of

cleararjjje between the rocker arms and valve stems. If the rocker arms

are tight,- the front piston is on its exhaust stroke, not its compression

stroke. Rotate the crankshaft one full turn, line up the timing mark

again, then wiggle the rocker arms to be sure the front cylinder is on

the compression stroke.

15 Perform Steps 11 through 13 above on the front cylinder rocker

arms to adjust the front cylinder's valve clearances.

16 Check the O-rings on the rocker covers, timing plug and

crankcase cover plate and replace them if they're flattened, broken or

have been leaking.

17 install the rocker covers and tighten their bolts to the torque listed

in this Chapter's Specifications.

18 Install all components removed for access.

XV700 through 1000 models

Refer to illustrations 18.22, 18.23, 18.24a and 18.24b

19 Remove the seat (see Chapter 7) and the fuel tank (see Chapter

3)-

20 If you're working on a 1981 through 1983 model, remove the side

covers if they block access to the tappet covers.

21 If you're working on a 1984 or later model, remove the air filter

housing (see Section 14) and the mixture control valve case (see

Chapter 3).

22 Remove the rocker covers (see illustration).

23 Remove the alternator cover from the left side of the engine (see

illustration).

24 Turn the crankshaft clockwise with a socket on the turning bolt

(located inside the crankcase cover plate). Watch the edge of the

alternator rotor (visible through the timing plug hole) and stop turning

when the line next to the T mark is aligned with the pointer inside the

hole (see illustrations). This places the rear cylinder at top dead

center (TDC) on its compression stroke.'

25 Perform Steps 10 through 15 above to adjust the valve clearances

on both cylinders.

26 Check the O-rings on the rocker covers and alternator cover and

replace them if they're flattened, broken or have been leaking.

27 Install the rocker covers and tighten their bolts to the torque listed

in this Chapter's Specifications.

28 Install all components removed for access.

19 Idle speed - check and adjustment

Refer to illustration 19.3

1 The idle speed should be checked and adjusted before and after

the carburetors are synchronized and when it is obviously too high or

too low. Before adjusting the idle speed, make sure the valve

clearances and spark plug gaps are correct. Also, turn the handlebars

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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