New owner of 1970 ct70 2,670 miles. When its warmed up it sounds like the cam chain is loose. I don't see the cam chain tensioner locknut and lockbolt by the shifter like it says in the manual I have. I see the cam chain tensioner sealing bolt across from the oil drain bolt. How do I adjust it? I put the strongest pair of reading glasses on in the house still can't see locknut by shifter. Do I need to take shifter off to see lockbolt? Thanks for any help Ron