I'm not sure.. I opted for a front bumper weight. I think I rememebr reading the ym240 manual, and the max weight added tot he front was like 250# or 280#.
Front weights on my cub are 50# each. I'm guessing the ones onthe 8n are similar.. 65-75#.. course that steering setup is a tad better than the 1700's. Id want 5 max on the wheel.. if only for a size/clearance issue. The fronts on the 1700 are very small.
My bumper arangement consisted of two ford suitcase weights and a 2-tube concrete and iron filled pipe bumper. Weighed in at about 135# to 150#. Was enough to let me pick up a 30" rear scoop full of dirt and not be a teeter-totter... Don't ask me how I know /forums/images/graemlins/blush.gif
The weight ont he front doesn't make steering a problem.. as long as you are using it to offset weight ont he rear. otherwise if you have lots of rear weight.. turning and steering is 'lite'. The front weight ballances the rear weight. In any case.. on most machines without power steering, and using 3-rib tires.. I generally don't try to steer unless I'm moving... just easier.. etc.
Soundguy