9.1 Carburettor assembly

1. Choke linkage bar

2. Choke cable clamp

3. Throttle cable bracket

4. Lower joining stud

5. 5 mm nuts

6. Upper joining stud

7. 6 mm nuts

8. Synchronising screw

9 Synchronising screw springs

10. Joining stud spacers

11. Sub-air cleaner joint

12. Breather joint

13. Fuel joint pipe

14. Idle speed adjuster

15. Throttle linkage spring

9.5 Carburettor joining stud nuts (arrowed)

carburettor, making sure the top end of the spring locates into the centre recess inside the cover, and aligning the protrusion on the cover with the tab on the diaphragm (see illustration 7.3). Tighten the cover screws securely. 14 Install the carburettors (see Section 6).

9 Carburettors -

separation and joining

_A

Warning: Refer to the precautions given in Section 1 before proceeding

Separation

1. The carburettors do not need to be separated for normal overhaul. If you need to separate them (to fit a new carburettor body, for example), refer to the following procedure (see illustration).

2. Remove the carburettors (see Section 6). Mark the body of each carburettor with its cylinder location to ensure that it is positioned correctly on reassembly.

3. 

   Unscrew the heater hose union retaining screws and detach the unions, noting how they fit against the carburettor bodies (see illustration 7.2).

4. Remove the screws and washers securing the choke plunger linkage bar to the carburettors. Lift off the bar and remove the collars and the return spring, noting how they fit (see illustrations 7.13a, b, c, d and e).

5. Alternately loosen the nuts on the left-hand

end of the threaded studs which join the carburettors together. Remove the nuts and withdraw the studs (see illustration). 6 Make a careful note of how the carburettor synchronising screw springs and throttle

9.6A Throttle linkage springs (a) and fuel supply joint pipe (b)

Fuel and exhaust systems 4»11

9.6b Breather joint pipe (C), sub-air

cleaner joint pipe (D) and synchronising

springs (E)

10.2 Accelerator cable (a), decelerator cable (b), lock nut (c) and adjuster (d)

10.3 Accelerator cable (A), decelerator

cable (B), adjuster locknut (C) and lower

lockouts (D)

linkage springs are arranged to ensure that they are fitted correctly on reassembly. Also note the arrangement of the sub-air cleaner, carburettor breather and fuel supply joint pipes (see illustration)

7. Carefully separate the carburettors, taking care not to damage the fuel and air joints between each carburettor. Keep a careful watch on all springs as the carburettors are separated; the synchronising springs should stay with the adjusting screw, but if they don't, refit them so that they are not lost.

8. Pull out the fuel and air vent joint pipes and discard the O-rings as new ones must be used.

9. Detach the carburettor joining stud spacers. Note how the choke cable bracket is held against the left-hand carburettor body by the upper spacer.

Joining

10. Assembly is the reverse of the disassembly procedure. Fit the fuel and air vent joint pipes and the stud spacers all to one carburettor first before joining the two together. Use new O-rings on the fuel and air vent joints, and smear them with clean engine oil.

11. Tighten the nuts on the carburettor joining studs to the torque settings specified at the beginning of this Chapter. Note: The upper joining nuts (nearest the engine) are 6 mm and the lower joining nuts are 5 mm thread diameter. Take great care when tightening to avoid damaging the carburettors.

©

12. Check the operation of both the choke and throttle linkages ensuring that both operate smoothly and return quickly under spring pressure before installing the carburettors.

13. Check carburettor synchronisation (see Chapter 1).

.

10 Throttle cables -

removal and installation

*

A Warning: Refer to the precautions given in Section 1 before proceeding.

Removal

1. Remove the fuel tank (see Section 2). Whilst it is possible to detach the throttle cables with the carburettors in place, there is a limited amount of space to work in. If required, displace the carburettors to improve access (see Section 6).

2. The accelerator cable is the front cable in the twistgrip, the decelerator cable is the rear one. Slacken the locknut on the accelerator cable adjuster and thread the adjuster fully in, then tighten the locknut against it (see illustration). This resets the adjuster to the start of its range.

3. At the carburettor end, slacken the rear (accelerator) cable adjuster locknut (above the bracket) then unscrew the lower nut off the adjuster (see illustration).