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Brakes, wheels and tyres



Hold string so that these distances are equal

14.5 Wheel alignment check using string

t

Siring held taut

Check (or contact hem


Fix string here


 


13.2 Check the wheel for radial (out-of-

round) runout (A) and axial (side-to-side)

runout (B)

^~"^-^5v. Distance between ^^ gauge end tyre must ^f be equal each side -^/ and tront and back

Perfectly straight lengths of wood or metal bar

Rear tyre must be parallel to gauge at front and back

H2MS0

14.7 Wheel alignment check using a straight edge


can be rotated to check the runout (see illustration).

3 An easier, though slightly less accurate, method is to attach a stiff wire pointer to the fork slider or the swingarm and position the end a fraction of an inch from the wheel (where the wheel and tyre join). If the wheel is true, the distance from the pointer to the rim will be constant as the wheel is rotated. Note: If wheel runout is excessive, check the wheel bearings very carefully before renewing the wheel.

4 The wheels should also be visually inspected for cracks, flat spots on the rim and other damage. Look very closely for dents in the area where the tyre bead contacts the rim. Dents in this area may prevent complete sealing of the tyre against the rim, which leads to deflation of the tyre over a period of time. If damage is evident, or if runout in either direction is excessive, the wheel will have to be renewed. Never attempt to repair a damaged cast alloy wheel.

1 Misalignment of the wheels due to a bent frame or forks, can cause strange and possibly serious handling problems. If the frame or forks are at fault, repair by a specialist or renewal are the only options.

2 To check wheel alignment you will need an assistant, a length of string or a perfectly straight piece of wood and a ruler. A plumb bob or other suitable weight will also be required.

3 In order to make a proper check of the wheels, support the motorcycle on its centre stand. Measure the width of both tyres at their widest points. Subtract the smaller measurement from the larger measurement, then divide the difference by two. The result is the amount of offset that should exist between the front and rear tyres on both sides.

4 If a string is used, have your assistant hold one end of it about halfway between the floor and the rear axle, touching the rear sidewall of the tyre.


 

5 Run the other end of the string forward and pull it tight so that it is roughly parallel to the floor (see illustration). Slowly bring the string into contact with the front sidewall of the rear tyre, then turn the front wheel until it is parallel with the string. Measure the distance from the front tyre sidewall to the string.

6 Repeat the procedure on the other side of the motorcycle. The distance from the front tyre sidewall to the string should be equal on both sides.

7 If necessary, a perfectly straight length of wood or metal bar may be substituted for the string (see illustration). The procedure is the same.



8 If the distance between the string and tyre is greater on one side, or if the rear wheel appears to be out of alignment, refer to Chapter 1, Section 1 and check that the chain adjuster markings coincide on each side of the swingarm.

9 If the front-to-back alignment is correct, the wheels still may be out of alignment vertically.

 

10 Using the plumb bob, or other suitable weight and a length of string, check the rear wheel to make sure it is vertical. To do this, hold the string against the tyre upper sidewall and allow the weight to settle just off the floor. When the string touches both the upper and lower tyre sidewalls and is perfectly straight, the wheel is vertical. If It is not, place thin spacers under one leg of the centre stand.

11 Once the rear wheel is vertical, check the front wheel in the same manner. If both wheels are not perfectly vertical, the frame and/or major suspension components are bent.

 

15 Front wheel-

removal andinstallation

Removal

1 Put the motorcycle on its centre stand and support it under the crankcase so that the front wheel is off the ground.

2 Remove the screw that retains the speedometer cable in the speedometer drive unit on the left-hand side of the front wheel hub, withdraw the cable and secure it clear of


Brakes, wheels and tyres 7*17





 


 



Date: 2016-01-14; view: 645


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