yup..happend with my khyber..
wen i pressed the clutch,the sound disappeared..n wen i release it,sound was back again n its annoyin sound...
got i solved by puttin zic gear oil SAE 85..there r 2 zic gear oils available..one is sae140,its thick..n one is sae 85..its lyk almost water,or little thick..
put it in n the sound will b over ...