Help a friend get her bike started due to a key issue, and having an issue of having a clattering after shifting to reverse or first when giving it some gas to start moving whether going forward or reverse. Called her to come over before I went any farther. Turns out she said it had been doing this for about 2 months and that the clattering goes above 10 to 15 miles. Rode her back and confirmed that it does go away like she said and it shifts for me in all the gears until I need to come to a stop. I have checked the oil level. Troubleshooting in the manual only talks about not shifting. Anyone else experience this?