I installed the vacuum gauge and it's working...
But i think there is something wrong. When it stationary the needle flipping all the time. See video. I found
this site. Here is all explanation about the gauge. But that one goes from 0-30. So if "0" equals off and "30" equals high compression than it's mirrored. Mine goes from red to green where red is off. But im not sure.
On this crappy video i start the engine and let it on for 10 sec and than stop it again whit-out giving gas. It's a 15fps video so it's not good to see the flipping. When giving gas (not in this video) than it's not flipping. Also when i push the gas down it will go to 0. (sorry for the crappy video, i need a new camera)
I think this could it be, but im unsure:
Drifts at idle,
stabilizes at higher RPM
Burnt valve; combustion chamber leak.