Noise cuming from motorbike gear box?

well i have a 125 chopper style bike,latley iv been hearin a grindin like noise,cant get into it 2 c prob,it all sealed,HELP

When is the noise occurring, when you accelerate? when you change gear? when you first start it? Does it go away after a while when the engine is warmed up??

You want a answer to a question with real little detail.

Either way if its grinding then something is wrong, there is no magic fix, try shorting the cable as above other its a workshop job, if you are one of these persons that accelerates hard and uses the gear hard your clutch plate maybe worn and its not enganging properly

try adjusting the clutch cable to a slightly shorter length to make sure it is disengaging fully so you are not grinding gears when you shift, if that does ot fix it you need to take it to the shop cause you have done damage to the gears and they are not easy or fun to work on.

Your cable is too short.

Must be a Harley. They sound like an empty coffee can with nuts and bolts being shaking around.

try adjusting the clutch cable first
when did it last have an oil change?
could be the chain is to loose ?
could be the bearings in the rear wheel ?

Change the engine oil, if there are lumps of metal in the oil you have major problems.

im gonna need a little more info than that