Ohh shazi jani..
How ru ??yaar baray din baad koi issue laye kar aye hoo..:P,mai tou samjha tha kah u sold ur mehran..
Anyways,tappet adjustment is only needed when u can hear a tick tick sound when u start the engine,there is a distinct sound of tappet and if u have heard ur car engine when normal u'll distingush it right away.As for charges..Hell no..its waaaaaaaaaaaaaaaaaayy too much..I only pay rs.250 for tunning and tappet adjustment where i go for check-up.BTW Tappet adjustment is included in tunning of car at most workshops