what is a good compression? i just tested dry compression for my BT is 165psi. is that a fair result?
Im using 0.5mm metal gasket and 82mm piston

I'm being too lazy to look up the actual spec right now but that is pretty low. What's your elevation? It should be closer to 200 stock at sea level but will be a lot lower if you live at a considerable altitude.
It is also possible for different gauges to be off and other variables to change the result. Bigger cams will tend to lower the static result. Something like cam/crank timing being off could seriously effect compression too.

i will try again with a healthy battery. my battery was going flat then.

yea i youtubed a few compression test vids. and most of them got around 200-210

Minimum spec is 156 PSI, standard 193 or more. Max difference between each cylinder is 14 psi or less.

just did a "wet" test. result was 240 270 260 250. good enuf for me.

i learned that dry test arent accurate. if you can wet test. you gotta do the leak down test

I will look up on that, tq