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if it ain't broke, don't fix it stresses
gen.	не сломано, не чини (Leave something alone; avoid attempting to correct, fix, or improve what is already sufficient (often with an implication that the attempted improvement is risky and might backfire). I know it’s an ugly looking antenna, but you know what they say: If it ain’t broke, don’t fix it. WT Alexander Demidov); не сломано-не чини (something that you say which means if a system or method works well there is no reason to change it. We're happy with our exam system in Scotland, and as they say, if it ain't broke, don't fix it. Cambridge Idioms Dictionary, 2nd ed. Copyright © Cambridge University Press 2006. also if it's not broke, don't fix it. it is a mistake to try to improve something that works. He hasn't made a lot of changes to the team since taking over as head coach, figuring if it ain't broke, don't fix it. Cambridge Dictionary of American Idioms Copyright © Cambridge University Press 2003. Alexander Demidov); не трожь, если работает (If something is reasonably successful or effective, there is no need to change or replace it: Stick with the plan! If it ain't broke don't fix it MORE EXAMPLE SENTENCES And absent some kind of explanation, people may remember an old saying: If it ain't broke, don't fix it. Most small businesses, rightly, resist change: if it ain't broke, don't fix it. I am not a revolutionary, and generally espouse the "if it ain't broke, don't fix it" school. OD Alexander Demidov)
idiom.	от здоровья не лечатся (igisheva); то, что не сломано, не нуждается в ремонте (Andrey Truhachev); не нужно ремонтировать то, что не сломалось (Andrey Truhachev); не сломалось – не чини (It means don’t attempt to alter or improve something that is already working reasonably well. The idea is that often, the more something is fiddled with, the more likely it is that something will go wrong. Especially when the motivation for meddling with something that is already working satisfactorily is hubris or one-upmanship. Alex_Odeychuk)
proverb	лучшее – враг хорошего (Баян); работает – не трогай (masizonenko); работает – не трожь (вариант: работает – не тронь Моторола); от добра добра не ищут (Баян); не сломалось – не чини (masizonenko)
if it ain't broke don't fix it
proverb	работает – не трогай (masizonenko); не сломалось – не чини (masizonenko); не лезь в отлаженный механизм. ( bit.ly masizonenko)