im trying to restore my dads 2000 hero honda cd100. its been sitting idle since 4.5 years and decided to give it a proper wash today ,even then the vehicle was almost rusted. i removed the tank and it was full of rust inside i tried to clean it with petrol with few nuts and bolts inside and voilent shaking
. but i noticed that the fuel tap had completely rusted and needed replacement 
well i have some querries
1.I would like to replace the engine oil and dont know how to drain the existing oil in the engine,i cant seem to figure it out can someone help me(a pic would be helpful)

and what engine oil should i be using??2.i have included the pic of the fuel tap. will i get replacement in hero honda spare stores??
3.what should i be checking,i mean all the do's and dont's to get a hope that the engine will start before even giving it to mechanic.
i'm a noob in all these terms so please help me





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