i do mine with al plugs out an tb open 150 is a worn engine in my eyes BUT !!!!!!!! i got roasted for saying that on toc-irl and told him rebuild was on the cards soooon AND hoy no way they said gooood engine !!!!
so i hope i dont get roasted on here now to ha ha
not in 5e colins eyes anyways rebuild on the cards soon enough
cylinder 1 and 4 look like there is no rings left on them pistons / or dodgy valve seals on there but 99% sure its rings