Checking tyre pressures and condition

The tyre pressures should always be checked when cold, preferably after the machine has stood overnight. Whenever the machine is ridden the temperature inside the tyre, and thus the air pressure, increases. It follows that any pressure measurement made after a run will be inaccurate by several psi. Ii is recommended that a small pocket type pressure gauge is purchased and carried on the machine. There is inevitably some variation between gauges found on garage forecourts, and to be sure of consistent readings it is better to stick to a known gauge. Remember that apparently small discrepancies in pressure can have a tangible or even dangerous effect on handling and roadholding. The pressure settings shown below are those given for the original tyre fitments. If different brands or sizes of tyre have been fitted, check the tyre supplier or manufacturer for the correct pressure recommendation for your machine, and mark the owners handbook and this manual for future reference. The figures quoted refer to the machine with various loadings. These include the rider, passenger and any luggage carried.

The rear brake adjuster

Check tyre pressures using an accurate gauge

Tread depth can be checked as shown

In the case of this tyre, a tread depth gauge was unnecessary. This tyre is dangerous, and in many areas, illegal

Tyre pressures - tyres cold Front - psi Rear - psi

Each time that the tyre pressures are checked, give each tyre a close visual examination and remove any stones or other objects trapped between the tread. Look for cuts or abrasions on the tread and tyre sidewalls. Note that any such defect warrants full investigation and may require tyre renewal. It cannot be stressed too highly that the rider's and passenger's lives depend on the tyres being in a safe condition. It is possible for serious damage to the tyre carcass to show no outward signs, so if an impact with a kerb or an object in the road has occurred make sure that the tyre is safe. This may necessitate tyre removal and recourse to a tyre expert, but do it. Internally damaged tyres can and do fail suddenly, and the results can be fatal.

Note that the tyres are of the tubeless type on some models and this will minimise the risk of sudden deflation. The drawback of tubeless tyres is that they are difficult to remove and fit at home (see Chapter 5, Section 26). If a nail or other sharp object can be seen to have punctured the tyre it must be investigated immediately, even if no pressure loss has been noticed. For most people, this will entail removal of the wheel and a trip to a tyre specialist or a Yamaha dealer. If so, leave the object in the tyre to identify the position of the suspected puncture.

There are a number of tyre sealers or punctur preventatives on the market, but their use should be considere with caution. Opinion is divided as to whether they are safe, ari a number of tyre manufacturers have issued clear warnini against their use. Although the tyre companies cannot bt| considered unbiased in this matter it is generally agreed that ml sealer can be considered a safe permanent repair. Use yom discretion and check local laws before using any of thestfl products.

Finally, spin each wheel and check for bearing play bvB rocking the wheel against the spindle axis. If movement ill discovered it is likely that the bearing will be in need of renewal« though very slight movement is almost always evident. If iifl doubt remove the bearings for cleaning and examination sil described in Chapter 5, Sections 21 or 23.

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