How easy is it to fit a cam chain and link in sit to a Honda CB 750 1994. and what is the main problem with a rattling chain on one? is it mainly the chain for the cam, or the lower drive chain for the pump.

Eaasy take off the timing /rocker cover and the top chain guide exposing the top of the chain undoo locknut and back off tensioner then break chain after tying both ends with cord so they cant fall in then splice the new chain onto the old and wind it through taking care to not let it jump teeth on timing wheels, detatch old chain from the new one, swage rivet pin in join of new chain crank engine by hand with a spanner two full rotations to check for valve piston interference and reassemble tighten tensioner until chain feels tight then back off 1/4 turn put back upper chain guide and bolt down rocker cover and you are done easy