If it's anything like my 2002 Exploder, it had a normal type timing set that connected the crank to the jack shaft and the crank to the balance shaft. Then there was a timing cassette on the drivers side front of the motor and one from the jack shaft to the passenger side in the back of the motor. To replace all of them the motor has to come out, fly wheel / flex plate comes off, balancer comes off, etc.... MAJOR PITA! and the parts alone are $500+. I had read that if you just have a little ticking it may just be a tensioner that is fairly easy to replace and can be bought for <$30, mine (for the drivers side head) was located just to the right of the water neck.
Something in mine let go and the engine started running rough, MIL on, etc....