Yes, 2-stroke engine oil can go bad over time. If stored improperly or for extended periods, it may degrade, leading to reduced performance and potential engine damage. Factors such as exposure to heat, moisture, and contaminants can accelerate this degradation. It's best to check the oil for any signs of separation, discoloration, or unusual odor before use.
Oil used in a 2 stroke motor is specially engineered to provide lubrication and to burn. The oil is burned in the combustion chamber.
Lack of oil changes.
you don't mix the oil/gas. you only do that on a 2 stroke engine. that is a 4 stroke. it has a separate reservoir where you put your oil. just put unleaded gas in tank and go.
For a 100 cc 2-stroke engine go-kart motor, you should use a mixture of gasoline and 2-stroke oil, typically in a ratio of 50:1. This means for every 50 parts of gasoline, you should add 1 part of 2-stroke oil. It's important to use high-quality, low-ash 2-stroke oil to ensure optimal performance and engine longevity. Always check the manufacturer's recommendations, as some engines may require different ratios.
it may go bad, it is better to replace the oil
Depends on how much oil there is. Running any four-stroke engine with low or no oil is going to cause serious damage. Connecting rods and head parts would most likely go first. Oil acts as a coolant for internal parts as well as a lubricant. Without oil to lubricate, parts will only get hotter, and without oil to cool them, bad, bad things will happen.
Oil in a sealed container does not go bad.
Go-karts typically require two-stroke engine oil if they are powered by a two-stroke engine, which is mixed with fuel at a specified ratio (commonly 32:1 or 50:1, depending on the manufacturer's recommendation). For four-stroke engines, a high-quality motor oil, usually 10W-30 or 10W-40, is appropriate. It's essential to consult the go-kart's owner manual for the specific oil type and mixing ratios recommended for optimal performance.
Bad very very bad.... engine will get too much oil and overheat and go boom... lots of smoke...
http://wiki.answers.com/Q/If_you_have_no_oil_in_the_engine_would_that_cause_the_7th_cylinder_to_go_bad"
It could be the cause of the knock only if the gasket was bad and leaked out almost all the oil.
The engine runs a lot hotter than a four stroke engine, you should only use oil that is made specifically for a two stroke motor other wise you run the risk of catastrophic failure. assuming that you have already done that then the other reason is that in the process of firing and compressing the pistons, there is a stroke that can be referred to as a dirty stroke ( that is why a two stroke has such a gassy smelling exhaust) this stroke is one that lines the walls of the cylinder with a thin film of lubricant (oil / gas mix) to make way for the next stroke, the combustion stroke. Now after the engine has warmed up enough the gas portion of lubricant vaporizes and is ignited and helps with compression of the other piston(s). so that process burns the oil and in turn will make the oil per to say turn black. Two stroke engines should be taken apart and cleaned pretty regularly and proper jets should always be adjusted or replaced under hard use, they do wear out like water running down a river bed.