Answer Posted / ptm

2 stroke engine lack a dedicated cooling system as in 4 strake engine. the crankcase of 2 stroke engine doesnot contain lubricating oil.

As the mixture of oil and petrol reaches crankcase in 2 stroke ,the petrol gets vaporised and transferred to cylinder for combustion leaving the oil lubricating the parts of crankcase.
The connecting rod uses a roller bearing which requires less lubrication .

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