NOt many I would hope - apart from anything else it is not a nice thing to do the the next buyer. I bet your mate would be pissed if he found his speedo either wound back or disconnected when he brought a bike or car.
Also a cop pulling his for speeding wont accept no cable as an excuse ans he will not be able to argue he was not doing the speed alleged
With no speedo cable the bike is not warrent of fitness compliant and can be put off the road, prob not the first time but caught by the same cop twice.........
If you say either "I can" or "I can't" your correct.
Bookmarks