And for your factcheck present, the McWhirter brothers were indeed twins, but not the heavy brothers so memorably riding minibikes (the manufacturer missed a trick in not hiring them to do ads for the durability of their little motorcycles, if they didn’t)…they were the editors of the THE GUINNESS BOOK, till one was killed (in an IRA bombing, as I recall) and the other soldiered on alone.

This page notes that the minibikes were the McCrary Bros., and they indeed were hired by Honda to tour. It was an opportunity hard to miss.

http://goodsparkgarage.com/the-motorcycling-mccrary-twins/