Also please check out Panagiotis Mitsopoulos's list: letterboxd.com/panmits86/list/movies-on-youtube-full-free/
UPDATE: Jesus I did not expect this to be my highest rated list on Letterboxd. Thanks guys!
NOT ON LETTERBOXD:
Vacation Massacre (2001 SOV): www.youtube.com/watch?v=Hwz48dce56s&list=PLFuos7mhlmoVCtE6zSKXxAR3Fl0hbREo6&index=22
The Silent Service-https://www.youtube.com/watch?v=euV4ki99yvk
Rockin' with a Bullet: www.youtube.com/watch?v=rZ5uKAoLvuY&list=PLFuos7mhlmoVCtE6zSKXxAR3Fl0hbREo6&index=58
Death Force (1989): www.youtube.com/watch?v=Cbe10gGovcA&list=PLFuos7mhlmoWmCUIXRgZK5JeculLScLmH&index=173
Night Visitors: www.youtube.com/watch?v=ktbj_mBJ5XM&list=PLFuos7mhlmoWmCUIXRgZK5JeculLScLmH&index=307
Crazy Commando Squad: www.youtube.com/watch?v=0I6R7Y1r5Fw
The Ninja Showdown: www.youtube.com/watch?v=2wgEERvMDM8
Raiding Invaders: www.youtube.com/watch?v=4SfMVjulv_o
Dirty Heroes: www.youtube.com/watch?v=dy7B7wW7GMA
Dongalu Baboi Dongalu: www.youtube.com/watch?v=cCZKHe0aDVI
Bugdu ui Gwon (Korean live-action Fist of the Northstar): www.youtube.com/watch?v=PZ3zUPI9ZPc