If the 'grinding' only happens when the bike is in motion, the problem is probably not inside the engine. Remove the chain and then start the motor. Put it in gear(s) and listen for the noise. No noise eliminates the engine as the problem.
Now lay the chain on the concrete and 'compress the chain in a straight line. Mark the end of the chain on the concrete. Now hold on to one end of the chain and stretch the chain. Did it stretch more than one inch? Replace it if it did. Look at the chain. is it rusted? Is it limber or do the links resist bending? Replace the chain if rusty and stiff.
While you are doing all this, check the rear wheel. Does it spin freely. Make any noise? Does the rear brake go on and off properly? Next check your sprockets. A bad sprocket will ruin a new chain. The ends of the teeth on the sprocket should be rounded. A worn sprocket shows pointed teeth. I have seen teeth so pointed they could pop a balloon. LOOK at both sides of the front and back sprockets. Are they rubbing against anything anywhere? Look at the chain, any rubbing? Is the tire rubbing on anything? Did the prior owner install heavier sprockets and bigger chain than stock sprockets and chain? > Check with the dealer.
Chances are you will find the problem if you do the above.
I hope you can rate this solution as a 'FixYa".
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