Update:
2 Days back our mechanic told us to go to a workshop named M.Ali Engineering near Waterpump for Lathe Machine work for engine and repair of Gearbox. On opening of Engine it was found out that bore and pistons were not in very bad shape but crankshaft was. Crankshaft main bearing were already resurfaced to 1.25 and had been done 2 or thrice at least before. He advised us that he can repair and polished crankshaft and told us to buy oversized or undersized (I forgot) main bearings.
Luckily, we found a guy who was selling crankshaft of Cultus along with main bearings and rods. So, we grabbed the item and got them inspected with M.Ali Engineering and he said that it was in very good condition.
Apparently, Cultus and Khyber have same Crankshaft.
Crankshaft cost us around 14k
All other parts are yet to be delivered to him. All of them will be of Fuji or other Japanese brand
Gearbox repair Cost us around 8000