I have a Yamaha FZR 250 that has timing chain noise

Timing chains usually have chain tensioners that can be adjusted with out taking apart the front engine covers to access the chain itself. Lok at a for manual for this adjustment.

They are very easy to adjust you will find the adjuster at the rear of the engine my advice to you would be to purchase a workshop manual for the machine it will give you step by step instruction with pictures wich will make the task at hand even easier

hi,if it is anything like the 400r,the tensioner will be automatic and non adjustable,normally the chain guides wear out before the adjuster reaches it outer limit,they are quite esay to replace but you need to take the cams out to do it,you will probably find that a lot of the noise coming from the motor is the clutch basket,as a matter of course they are quite noisy once you start to get a few km on the bike...cheers

check the cam chain tensioners.

Your bike has electronic ignition. There is nothing to set or reset on the timing. Change the spark plugs, adjust the valve lash, change engine oil and filter, clean or replace the air filter, lube and adjust the chain and cables, inspect the sprockets and wheels, add water to the battery if needed, wash the bike. That's pretty much everything the dealer does.