I have noticed a razzle and ticking sound on my YZ400 98:a. There is this razzling sound on idle. I did a search here and i do believe its the key for the counterbalancer. But, if its the timingchain, how can i notice the differences? Can i listen to the sound? This razzle sound is all trough the register and i do believe it do come from the clutchside on the engine. If i replace these, should i replace on both sides?