Hi, I just want to know how do I test the compression right after Reassembly the engine together. Like this one .

https://www.youtube.com/watch?v=3UyQ8I1ukfQ


Where did they blow the air in etc. I just want to know they did this. Thanks

 

As long as the intake ports are open, just crank the engine over with the starter and the "air" will be compressed by the turning rotor and you'll see the pulses. Make certain schrader valve is removed if using a piston engine compression tester.

 

with a starter motor, bellhousing and compression gauge? durr.