Hello, I have a DRZ400E (Australian) , it has 17,000 Kms on the clock. However i have gone through THREE cam chains in this time, soon to order my fourth. Why is this happening. It had a top end rebuild at 10,000kms with new chain. first chain went when using the ACCT the next chain went using the MCCT and this cam chain is at its limit and i am using an ACCT. WHYY.