Upon further review, I've come across the width spec. Unfortunately, it is 42 inches wide. Any other recommendations on a riding mower that will pass through a 40 in opening would be greatly appreciated.

I'd look at one of the Rear Engine Rider's (RER) Snapper has been making them forever and might be a good place to start. What you don't offer in your OP is, how big is the rest of your estate? e.g. If you've got two acres to mow and get a 30" rider, you ain't gonna be happy. :-) Unfortunately, "small" in width of cut also translates to "entry level" or cheaply made in "traditiional" riding mowers.

Good luck,

Ev

A small zero turn might work

http://www.mowersdirect.com/lawn/30-39-inch-zero-turn-lawn-mowers.html

I have approximately .5 of an acre. Not much, and I have the self- propelled and the 12 year old boy needs to start earning his keep... You know where I'm headed. ;)

Just went to Lowes, where the TB30R is being sold for $1000. I measured the width and its 36 inches. Went to a local mower shop and looked at some small Snapper riders. The Snapper products differently looks like the ones to go with. Still leaning toward having the boy use the self-propelled, until it bites the dust and then get the rider. Thanks for the input.

The 40" space can not be widen? How permanent is the 40" space; between two house, through a garden arbor. etc?

If it can not I would get the best mower for the rest of the yard, and use the old mower in the 40" area.

When I got tired of that I would look to changing that area so it did not have to be mowed, or could be managed with a weed eater.