Here is a rim width chart for motorcycle tires.

The rear rim is 2.75 inches wide.

The stock 140/80 and replacement 140/90 tires are acceptable on the stock rim - but are really the correct size on a 3.50 rim....so the beads are squeezed in 3/4" more than is desirable.

The 130/90 tire is actually a better fit of the rim on our bike, and most likely will handle better.

http://www.mtsac.edu/~cliff/storage/gs/Motorcycle_Rim_Width_Tire_Size_Chart.pdf

The extra weight will most likely affect your acceleration a bit.  Not only do you have to accelerate the tire weight linearly down the road with you - you will also have to accelerate it rotationally.  The extra weight increased the flywheel affect, and it will be harder to increase of decrease the speed a bit.  Probably not a big deal....but I suspect you will feel it.

My mistake was in ignoring the weight of the mounted tire. The original tire/wheel weighed 27lbs, the new Kenda 140/90 is 33 lbs. That's an extra 6 lbs below the springs.  Any suspension/hotrodder/sportscar guru would cringe at adding unsprung weight. More weight means less HP to fling you down the road. Also, a fatter profile is less nimble around corners etc.
I won't make this mistake again!!!

The only potential saving grace here is that the Kenda has a very obvious triangular profile, much like the old Dunlop 'triangulars' popular in Hailwood's/Agostini's day.

Buy the 130/90!
ps: norton commandos use a 100/90 rear!

The large rear tires are a fashion statement on a Cruiser in some respect -  however they might offer a bit better ride on a bike with limited suspension travel, the larger profile helps make the bike a bit more stable in a straight line, and the added rubber might help with tire mileage.

We have become used to seeing the big rear tires on Cruisers.....and now if you mount a narrow tire for handling - it somehow looks just a bit too skinny.  I am currently running 18" rims on my bike and I have a 90/90 on the front and a 110/80 on the rear....and it is plenty of tire for the weight and HP of the bike and is proper looking for the Cafe' style bike (it would look goofy on a cruiser).

by which time you will have adjusted to the 140 / 90 and you will be very pleased when you go the other way