Chainsaw Repair

I took on trade, a 200t that owner couldn't get to run and he thought crank bearings were bad or crankshaft was bent?
A few days later I somewhat checked the saw out. This individual had installed a Chinese? ? cylinder kit and had misaligned the flywheel key and forced the nut tight. That might have been the indication the crank was bent?? Flywheel, of course,  was hitting coil.
Now, I ran a compression check and got 90 lbs.
Tore the motor apart and everything looks new, with .005 ring end gap.
Why only 90#? Gauge is not wrong, just pulling the cord told me compression was very low. Is this typical of china junk cylinder kits?

That's what I was thinking, but haven't had time to really check.
I have never used a Chinese replacement cylinder but this doesn't surprise me.

Yes Al, I realize that. I have rebuilt hundreds of engines, from caterpillar diesel to tiny two strokes.
One must realize that if you could ever get an engine to run, on 90# compression, rings would eventually seat.
But ring gap would also increase.
Instead of trying to work with Low Quality China Junk, I think I will wait for a used P/C.
I would rather have a worn quality part then new China.
Thanks for your thoughts.

I'm thinking the squish is around .035 on a stock 200.It might be such a thing it could be fixed by shaving a little off the cylinder base to raise the compression .Not much to loose,it doesn't run the way it is .