Yes, technically overdrives do exist in motorcycles (Output of transmission faster than input). It is moot point for motorcycles however. Chain driven motorcycles can be re-geared simply by changing the rear chain sprocket to a smaller one.
there are some 2 wheelers with diesel engine
No, not very often.
its two stroke ngine
Most likely a restrictor plate
no minors should not be given two wheelers to drive
Depends on the dimensions of your 4 wheelers
General motor insurance plans for four-wheelers and two-wheelers by Shriram General Insurance
to start bike early in cold environment i.e. in winter season.
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The ATC 250R (1981-1986) is a two stroke. Otherwise, all Honda three wheelers were 4 strokes.
two stroke diesel engine is used in cargo ships as cross head type engines, two stroke petrol engines used in two wheelers.
If you are talking about two wheelers, as in motorcycles, minors should not be given two wheelers to drive. A minimum age of 18 should be required since younger kids may not be responsible enough to make wise decisions when riding.