My new rebuild gx390 has very nice compression, why?

[Oilpan4]

I rebuilt my gx390 engine it was burning a ton of oil, as in fill it up and the low oil shutoff trips the engine off about an hour later.
I used a new honda block, reused the crank, cam side plate, the usual stuff. But I used a "F188" piston and rod kit. Go-kart guys seem to like using these F188 rebuild kits I don't know what, figured it was primarily price as it cost about half as much as Honda stuff.
Well I got it together and tested compression, with the compression release disabled I was getting 120psi of cold never fired compression with file fit rings and 10 thousands head gasket at 4,000ft above sea level.
Searching on the Internet 100 to 105psi at sea level is normal for a fresh engine.
I was wondering if anyone knows if the F188 kits have a piston with less dish or is the rod longer?

 

[Master Hack]

Don’t know what a F188 kit is, but NR sells a flat top piston and a .040 over rod.

 

[Oilpan4]

The "f188 engines" are the super cheap 88mm bore gx390 clones being sold.
Something in the power assembly is different from "ginuwine Honda parts".

 

[Denny]

I’m failing to see the problem. Other than the one you created when you removed the compression release.

 

[Oilpan4]

I didn't remove the compression release. Upon final assembly I set intake valve lash to like 3 thousands and set the exhaust valve lash one full turn loose, disabling the starting compression release. With the exhaust valve lash set correctly compression is less than 80psi.
I'll retest compression in a few weeks after its all broke in and I have to reset valve lash and install some 1.1 ratio rocker arms.
I replaced the tappets as one of them had a weird wear pattern. Hopefully I don't need a new cam.