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I get you now.

That one doesn't look like it's keyed to the crank case properly. Every one I've seen with a notch in the sleeve either has the notch pointing directly to the carb or exhaust port.

I'd really have to think that's not the right head for it. Like you have a .15 head and a .12 sleeve/piston.

I wonder if you have the right head button. Is it a two piece head/button or one piece head with button milled into it? That varies too. I used to run an OS 15 cv-r(x) in my xxx-nt and tried one in my t-maxx (underpowered for that).

I want to say it varies... you'd think with all the engines I've had apart, I'd remember better, but I don't. I want to say though, part of the button usually goes inside the sleeve a few mm, then along the rim is a shim to seal the button the the sleeve. Like here is what I remember: The...

Does the head move at all? In the photo's, it appears there's a gap between the head button and sleeve, but is hard to see.

It's hard to tell. Can you get it under a bench light without the flash, or try to get the flash to not light it up so much? If there is a shim, it's only .01/.05mm, so it's not thick to eat up the gap you see there. To me, it almost looks like your sleeve isn't seated properly. Pretty much...