06 Engine overhaul - find the TDC compression stroke

We will explain in this video how to determine the top dead center, as well as which of the two top dead center moments is this one from the compression stroke. This is important in order to properly position the distributor drive shaft. Properly understanding how a four-stroke engine works is essential when you begin an engine overhaul.
Timeline of this video
00:00 Introduction
00:25 Determining the compression stroke when the engine is rebuilt
02:10 Workings of the four-stroke engine
02:17 Movement of the pistons
03:35 The ignition of a four-stroke engine
06:43 The movement of the inlet and outlet valves
08:31 Valve tilt
10:30 Movement of the valves of cylinder 1
11:46 Next time: BDP compression stroke practical
11:56 Paruzzi Newsletter and Paruzzi TH-cam channel
Paruzzi's technical magazine is the ideal supplement for this video series, here are some articles related to this video:
Top dead centre www.paruzzi.com/magazine/en/0...
Ignition adjustment www.paruzzi.com/magazine/en/1...
The distributor www.paruzzi.com/magazine/en/1...
Vacuum advance www.paruzzi.com/magazine/en/1...
Parts mentioned in this video:
Distributor spring www.paruzzi.com/webstore/6238/
Drive shaft www.paruzzi.com/webstore/02238
Metal washers www.paruzzi.com/webstore/1592
O-ring www.paruzzi.com/webstore/2002
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[@jeffswanson9143]

Maybe I missed it, but in your diagram of the pistons TDC movement what are you showing on top of the engine. Pressure built up in the case releasing and then a flap closing after the pressure releases. Where is that flap located and what is it called?

[@paruzzi-english]

I think you are referring to the crankcase breather. It shows when the pistons are moving back in, a pressure will exist in the crankcase, and that pressure you get out to avoid oil leaking from every crack. It is not part of this content really. It will be discuss in later videos. Thanks for you interest.