To repair or buy a NEW? .. Chainsaw 52 cubes

Hi friends, I have a dilemma here, "To be or not to be," and it can only be resolved by disassembling and diagnosing. Which is better, buy a new one or repair an old chainsaw. And about this I talk in this video.
Links to references in the video:
1) Alteration of the chain tensioner • БЕНЗОВАНДАЛИЗМ Натяжит...
2) Repair of the boat engine (inspection of the cylinder) • Замена поршневой групп...
3) Diagnosis of the 72cc gas cutting machine (inspection of the piston) • Бензопила - бензорез о...
4) Complete assembly of the chainsaw • Полная сборка бензопил...