"Since you have bored the barrel out yu may have gone too far, and there's not enough "Land" beside the bore to close the carb when brought to idle. The absolute limit, of course, is having the bore 1/2 of the barrel's circumference, if the hole is bigger... Take the carb off and see if the throat shuts fully. Give it a little thought, you'll see the problem. Might be why your idle wont come down. "

I guess I don't really understand this part. My Carb will close 100% shut as viewed through the top of the carb. Are you saying look at it from the bottom? The idle can go down, it just wants to sputter more than I'm happy with. I can, click at a time, lower it until it shuts off the engine. Tomorrow, I'll force the idle down to the mid to low 2000s and see if I can set the mixture there. All I know about little engines tells me that they sometimes like a little higher idle. My 91s and my 72 I shoot for 2000 even. For my 51, I like anywhere in the mid 2000s. I just figured (assumed) a 25 would be a tad higher.

For sure, my particular 25LA isn't up to par with the way Jan describes them. I never saw a Swiss watch run better with parts on the ground.

My 46LA was really good, but the screw was far enough out to force me to pull the spring oversize. After that, I don't think I messed with it at all.

The only engine that I'd really brag about the consistency of is my YS 91 FZ. Now that's a Swiss watch. Everything else I'm flying gives me the occasional headache, but not my YS.

I hope the LA get's to where it needs to be. This little plane is a blast, but kinda tough to see at three mistakes (or one hovering deadstick) high. I need to trust the engine down on the deck to really appreciate this plane.