How do I adjust the valves?

From Ninja250Wiki

Why do the valves need to be adjusted?

What is the adjustment procedure?

Hints & Tips: Valve Adjustment

Is there a special tool to make this easier?

What are the acceptable clearance ranges?

Are there any advantages to selecting a specific setting within that range?
What happens if the clearances are too tight/loose?

Do I really need to adjust the valves every 6000 miles?

What is the "hot soak" valve cleaning method?

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