Could this be an example of what we often see now as Protection of Arses; by this I mean a statement that is supposed to protect an organisation from blame: "We told you to do X, Y or Z. If you didn't do it it's not our responsibility"
Spot on Greybeard. If BSA thought that this was a critical procedure, bearing mind that a new bike would have been well within the warranty period at 250 miles, I would have thought that BSA dealers, should have been mandated to do it on behalf of BSA. It is reasonable for warranty conditions to require the new owner to check oils, and tyre pressures, but entirely unreasonable to expect the purchaser of a brand new motorcycle to take things apart, and to buy replacement parts as well. Of course it also gave BSA plenty of wriggle room. "A" "B" "C" being damaged during dismantling or reassembly was/is due to you the customer for being negligent and or incompetent so your warranty is now invalid mate.