Took my 09 YZ450F out today for the first time. Noticed some clikcing comeing from the chain.. Got it home and realized it was tapping the inner frame rail.. Few Questions.. 1. What could be causing this? 2. Does anyone make a chain slider that has higher edges to keep the chain from coming in contact with the frame? 3. What is the purpose of the lower chain guide( under the swing arm)? Is this just to keep it inline with the rear sprocket? 4. How can I keep this from getting worse?