They might have been thinking it would be difficult to prime once you ran out of fuel and air got sucked in. I ran out on my 1800 one time shortly after buying it. I was close enough to a gas station to coast in and push it up to the pump. Being my 1800 is fuel injected, I thought it might be hard start back up but it wasn't. It just took a little longer to start it than it usually does. 1300's have carburetors and should be even easier.
2003 VTX 1800R