Q. I have heard that Yamaha R15 V3's engine get seize when it petrol gets full empty it should kept minimum some amount of petrol to keep it good condition of engine the emptying petrol can affect the engine or anything in the bike?

Its not a myth...... emptying petrol in a carburetor bike doesn't really affect the bike....but in fuel injected bikes like rs 200,r15,rc,duke,mt..etc. a minimum level of petrol is needed in the tank to keep the pump drowned in petrol,or else the pump can't efficiently supply petrol to engine and ends up in engine seizing.....so minimum 1 litre pertol must left in the tank

The truth is, it doesn't matter which bikes whether R15 V3 or any other, main thing is if you have fuel injector motorbike than you should follow the drill. The question is why ??. Because in normal bike there is carburetor, no such system like fuel injector. But in fuel injector vehicles the Injector works as motor by spraying right amount of fuel at right time to the engine by fuel pump. So less fuel may lead a heavy load on that phenomenon, and you end up to replacing all fuel injector system which may cost you around 10k to 12k (for R15 V3). But its never heard about engine get seize by keep least amount of fuel in tank.

Yup fuel pump will seize..it requires some fuel to cool down fuel pump