by geeves » Sun Aug 21, 2011 5:25 pm
Essentially they are variants of the same engine. The 250 is newer design but nothing really changed. You get a better emmisions result but also a little less power. (not as much less as you would expect with the smaller motor) Chassis etc is the same. I doubt there would be a significant difference in ecconomy
Unless you have a lot of big hills I would go the 250 but the 280 will perform better on hills
Sanding your knuckles before starting work can help. That way you cant skin them