I am going to get my Cultus, 06 (carby) engine get overhaul next week inshALLAH. But i heard many rumors that Cultus never perform good after engine overhauling or it will again give you issues after 5 or 6 months again you will be visiting mechanic? Is it true? Does it worth getting engine overhaul?

The reasons for engine overhauling are one of my car cylender is not jammed and some valves are giving missing issue that's why RPM never stay longer... Besides some noise in engine as well.