Ok dont listen to us.....no worries
1. You are jumping with cables barely able to provide power to the glow plug system for one...those are likely 6 or 8 ga wire if you are lucky.
2. I see you have a temporary battery end on one cable...what does the rest of the cables look like...we can knly imagine....those goofy ends are not a long term repair.
3. If you are cranking like you are over and over it IS KILLING THE STARTER FOR SURE.
4. The symptom uou are depicting isnt worth gettkng excited about jnless it does the same thing with a GOOD starter GOOD cables and GOOD batteries. If you get it spinning fast it may not even show up.
5. If worried about compression then stop ******* around and do a compression test and leakdown test.
6. The sound on PS vid couod be a bad valve and likely is not bad rings...it is known here as exhaust chuff or kntack chuff or huff...depending on where it comes from obviously
Hope this helps....diagnose when it is in good operational order and condition or do a proper diagnosis... Or yee be chasing a blind duck around a barnyard trying to figure **** out..
JM2CW
BTW....I had slow starting issues too....sounded similar to yours....changed 3 starters and built new cables...added group 31 stud top batteries...this is the thread...**** spins like rocket now no more drag no more issues....
http://www.oilburners.net/forums/sh...-101-Custom-battery-cables&highlight=Tech+101
Hope that helps you out.