Okay. I just wanted to be sure that I was already convinced on the aluminum washers. And I am. So that's the way im going. Now on to my piston... My local shop (G and R motor ports Walton Ky) is gonna do my bore and hone after I decide on my Piston. I haven't got a set of inside mics yet, but with the dial calipers at the top of the bore, it measures 68.45mm, in both directions, then measuring at the bottom it measures 68.5mm. This is after I ran a few passes cylinder hone through to clean it up.
There is no visible scarring on the cylinder, but the piston was toast. All scarred up at intake and exhaust ports. There were no thrust washers in place.
  I used to like the black oxide vertex race pistons. They lasted forever in my YZ125. I guess that's why I was hung up on the YZ piston thing for a minute. I've never been a fan of weisco. Seems like every broken blaster piston I've seen was a wiesco. Anybody know of a similar coated piston for the LT250R? If not, which should I get?
  Motorgeek, so does your company produce the aluminum thrust washers? If so, could I get a list of your related products/services, and prices please? My email is public on here, if u want you can send it to me. I can foreward the info to my local shop if u want. One of the owners loves old Suzuki 2-stroke stuff.

Measuring the bore at the top and bottom of the cylinder does not tell you anything about the inside diameter of the cylinder between those two measurements you are taking.  The piston does not live at the top and bottom of the bore, it spends most of it's life between the ends of the cylinder.

Digital or dial calipers are only good for taking quick and approximate measurements.  The life span of any caliper is short because the measuring surface of the thin blades ware quickly.  The accuracy is usually poor and not the proper tools to use when measuring piston clearance  or ANYTHING that requires accurate measurements. 

A bore gage is the proper tools to use when measuring a bore for roundness and straightness.  An inside micrometer is many times better than using a feeler gauge or calipers but is very difficult to operate accurately in the middle of the cylinder on these small quad bores.