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eg. of lower & higher pairs

A lower pair is one in which there occurs a surface or area contact between two members, e.g. nut and bolts in case of higher pairs there is line or point contact between two bodied for eg. cam & rocker arms

engine runs but backfires

Backfires is a pop or bang in the exhaust manifold it can be coused by the several conditions in ignition system. If the ignition timming is considerably offer if position cross fire occurs ignition may occur result before intake valve closed.

engine crank normally runs but fails to start

There is no spark during the sparktest, if the oscilloscope fails to show a secondary voltage pattern , there are several couses:- if you good spark , the ignition primary & secondary circuit probably are ok. The failure to start with a good spark is more likely due to trouble in the fuel system. the failure to start with a good spark is more likely due to trouble in the fuel system.