Suney,
The common niose with ZXR 250's is when you start the engine cold the noise will be like a loud ticking sound that will increase with revs and then disappear after 5 mins of warming up. As I understand it, this is the lose cam chain. Once the engine heats and expands the chain tightens. Some people think that it should be fixed by installing a manual chain tentioner, but to be honest this problem is unlikely to give you any trouble while you are on your learners. Mine has made the same noise for the year that I have had it.
However, if your noise is constant then the slack chain could cause wear on the engine casing and oil to leak out (not good), or skip a tooth (also not good). Get a mechanic to have a quick listen when you are next in the shop to see if it is in fact the cam chain or the valves as mentioned.
hope that helps
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