on my '02 400ex i sometimes hear a grinding noise when releasing the clutch...not like a klkkkkkcklank but like a more vibrational deeper sounding .. but onlyu when i release the clutch 7-10 times on take off only, i'm not sure what this is... any suggestions? also, my clutch is somewhat hard to pull in

 

The clutch cable would have to be the problem.

 

... but the noise sounds as if it's coming from the motor area... at least lower than the cable...