Cars Q&A

I own a Apache rtr 160 bike from pat 1.5 yrs. Now a days i'm facing a serious problem. There a 'click' kind of sound when i release the cluth. especially in 3rd and 4th gear. and also there will be sudden drop in pick up. This is been a headache for me since i love my bike too much. Can any one please tell what is the problem and suggest the remedy...