Bro they are OK. And I think I have found my solution. Thanks again.
Ok bro first of all I have found nearly 90% of This model has this problem.
My fan is not direct. And i have talked to many people they also say that 500 mein bhi jugar hai aur 4.5k mein bhi to 500 wala kerwao. CNG kit and cylinder + throttle and emulators are serviced .