I did one with "Moto Adventure Peru" a few years back. We put a group together and he did us a bespoke tour. The owner is a Brit and the guy on the ground who leads is a Brit.
Lima, down the coast, straight across the Andes on dirt for 5 days to Cuzco. Unbelievable "ROADS"? Only tarmac was in the towns.
Then we took the train to Machu-Pichu for the day. Then to Lake Titicaca, then down to Nazca and some of us flew over the lines.
Copper Canyon, fantastic place. The White-City. Riding a long way along the beach edge. We did a day on sand inland of the coast road in trackless sandy wilderness.
Lots of other stuff I have not mentioned or forgotten. So many memories.
Pretty bloody marvelous trip. On Suzuki 650 singles. Perfect bikes for it. Carburetors yet they still worked perfectly at 5,000 metres altitude, and amazingly so did I.
Wont be going again though.
Go for it.