Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders

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Automobile Engineering in ME
The crankcase dilution means

Dilution of oil by water in the crankcase
Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of fuel in the crankcase
Dilution of mixture passing through crankcase in two stroke engines

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