Cylinder and head work

[Greaser Greg]

Hello everyone! Who knows of a good two-stroke-tolerance-capable machine shop close to southern Illinois between, or near,  Paducah, Ky, St. Louis, and southern Indiana, that you'd recommend?  I have several sets of mismatched-size jugs and a few Pistons that I'd like to haul somewhere and get them measured so I can decide which ones to go with for a top end job.    
Thanks, in advance.

[pdxjim]

Figure out where the local guys take their Banshees and VMX bikes.

[Greaser Greg]

Local shop owner retired.  There is one other around. Not sure of their experience, though. We're all kinda going, "uhhh, now what?"

[Yamaha 179]

Greg:
We need a little more info.  What are you trying to accomplish?  Are you building a street engine to ride to a coffee shop on a Friday night or a drag bike/race bike?  Are the pistons you have new and all the same type, i.e., cast or forged?  In a routine street bike there is absolutely no reason not to run a 64.5mm piston in one cylinder and a 64.25mm piston in the other.  The engine will never know the difference.  You could also do that in a road race engine (I have done that) but not for long. 

Try and fit the pistons you have in the cylinders you have.  See how much clearance there is.  Pick the tightest pair and send them off with the next largest set of pistons.  Or, do some checking and come back for advice.  Use priority mail, it is the cheapest shipping service.
Lyn Garland

[Greaser Greg]

Well that's great news! I'm just riding around the back roads, not constantly flogging it, but some.
So, one cylinder at .25 over, with what was a balance and match port job with its mate doesn't mind being run with a .5  or .25 over with stock ports then as well?   What about dykes ring style piston with flat? Ok also? An hvc piston in one side with art in the other? One trimmed skirt with one not?
I'm using art pistons and Yamaha pins, so want to stick with cast pistons.
The one new piston I have at .5 over is dykes style so the rings may be way out there in cost. Guess I'll lay everything out and make a list to see what will be the most cost effective way to proceed as far as buying stuff.
I'm much more enthused about it now with this insight! Thanks again!
Are the specs for piston to wall clearance in the factory service manual still accurate values to measure for?