Not true. A 210lb fat ass on a kawi 250 like myself, and easily pull a 150lb kid on a Yamaha 250 up a hill. I have video evidence.
Just watched the gopro videos from today, and besides mup playing spoiler in 3 of 4 videos, I've also discovered it's not a good idea to let me hit you, as you will get out of shape. Hit two dudes today, one almost went off the side of a jump, the other one just about fell over.
I might be fat and out of shape, but if you're going to pass me on the outside, remember, I weigh more than you!