Sewing machine parts for cycle engines

[snopes]

Comment: My father was quite the joker when he was alive, so this very
well may be ad hoc. However, at a younger age, my father(who was
interested in motorcycles and owned a Harley) told me that certain
motorcycle companies(I believe Yamaha and Suzuki were on the list) once or
still currently used old sewing machine parts for the engines of their
motorcycles.

Lol your dad was pulling your leg with a very old Harley vs British cycle joke. From 1919 until 1929 the Sun Beam sewing machine company in England produced a motorcycle, the joke was that British motorcycle engines used sewing machine parts because a sewing machine company made cycles. Back when this joke started British bikes were the fastest bikes on the tracks, remember the Indian VS Harley jokes that went around between cycle racers? It later was changed from British Cycles to the Japanese cycles during the late 60's.