What do u mean by air leak inside carb? .. mjh doubt tha to ma na manifold(bend) or carburetor k bech m jo insulator hota ha us k dono side silicon lgai thi lkn still no difference
A leak can let more fuel to be drawn.There is a jet where needle sits i hope it's okay.
Yes it is ok too .. can u tell me what other factors egfect engine's mileage .... I have a carb jisy ek bike m lgau to white plug... Second m brown plug ... How is this difference possible?
Ignition current. A weak spark cannot burn the fuel properly.
Does oil condition/viscosity effect?Same oil but ek recent change ek purana
In idle case it shouldn't be. Until it's either too old or bad. Compression of engine does effect.