If you are a heavy rider or if you ride in dusty or dirty conditions, you may need to have the valves checked more frequently. You should also have the valves checked if you notice any of the following symptoms:
* The bike is idling rough or stalling.
* The bike is losing power.
* The bike is making a ticking noise.
If you are unsure of how often you should adjust the valves on your sport bike, you can always consult with your motorcycle's owner's manual or with a qualified mechanic.