No it isn't fatal, but it would smoke quite a bit, because a two stroke engine needs two stroke oil mixed in the petrol, and a four stroke just needs petrol.
When comparing to a two-stroke engine, the four-stroke engine has the following advantages.Fewer emissions. Since the crankshaft has its own oil reservoir there is no need to add oil to the fuel, meaning there is no oil burned in the fuel.Better fuel consumption. The four-stroke engine complete a full cycle in four-stroke. This gives it greater control over which ports open at which times. On a two stroke engine, fuel and air is being forced into the cylinder while exhaust is being forced out, this causes some fuel and air to flow directly through the cylinder and out the exhaust. Four-stroke engines are also directly fuel injected which allows greater control over fuel delivery.Longevity. The four-stroke engine has a lower power to weight ratio than the four-stroke engine. In this respect, the engine components aren't pushed as hard as a two-stroke. This allows them to last longer.
The strokes of a four stroke engine are intake, compression, power, and exhaust. The engine takes in the fuel, compresses it, uses it for power, and then the excess fuel comes out the exhaust.
One advantage of having a four stroke petrol engine is the fuel economy. A disadvantage of the engine is in the cold weather they are harder to start.
Fuel is fuel. The fuel only changes when you add 2 stroke oil to it. You can burn it in a 4 stroke engine, might smoke some, but it is not recommended for your normal outing.
Four-stroke engines have a spout where you add oil to the engine. On two-stroke engines, oil has to be added to the fuel. (Four-stroke and two-stroke are also called four-cycle and two-cycle, respectively).
Usually none at all.
Briggs and Stratton made almost exclusively four stroke engines. There is no fuel oil mixture for a four stroke engine. Are you sure you have a two stroke engine by Briggs and Stratto? rhg
Why the fuel consumption is less in 4 stroke engine as compared to 2 stroke engine
external cooling and with fuel
A four stroke engine has four basic operations within the engine. It has Intake, compression, power and exhaust strokes. During the intake, or suction stroke, a mixture of fuel air is injected into the cylinder.
The best way to know if an engine is 2-stroke or 4-stroke, is to look for an oil spout. If the engine has an oil spout where oil has to be poured into, it is a 4-stroke. If the engine has no oil spout and the oil has to be added to the fuel, then it is a 2-stroke.
There is only one intake stroke in a four-stroke engine. The other three strokes are compression, power, and exhaust. The intake stroke is a down stroke of the piston in which fuel is drawn into the cylinder while the fuel intake valve is open. The next stroke is the compression stroke in which the valves are closed and the fuel is compressed for combustion. The following stroke is the power stroke - a downward stroke of the piston after fuel combustion that drives the crankshaft. The final stroke is the exhaust stroke, an upward stroke of the piston as the exhaust valve opens to relieve the exhaust fuel fumes.