Running an old motorcycle without an oil injection system and relying solely on oil mixed with gasoline for lubrication can be risky and potentially damaging to the engine. While some vintage motorcycles and two-stroke engines operate with premixed oil and gas, they still require proper lubrication to prevent excessive wear and potential engine damage.
Oil injection systems were introduced in motorcycles to provide controlled and precise lubrication to the engine. These systems deliver oil directly to critical engine components, ensuring optimal lubrication under varying conditions. By relying solely on oil mixed with gasoline, you would not have the same level of control over the lubrication process.
Using a premix of oil and gasoline can be insufficient for providing adequate lubrication to all parts of the engine, particularly at higher RPMs or under heavy load. This could result in increased friction, heat, and accelerated wear on various components, including the piston rings, cylinder walls, crankshaft, and bearings. Over time, this could lead to decreased engine performance, increased oil consumption, and even catastrophic engine failure.
If your motorcycle does not have an oil injection system and requires premixing, it's crucial to follow the manufacturer's recommended oil-to-gas ratio specified in the owner's manual. This ensures the right amount of oil is added to the fuel mixture to provide the necessary lubrication. Failing to use the correct oil-to-gas ratio can also lead to similar problems mentioned above.
If you're unsure about the specific requirements for your motorcycle, it's advisable to consult the manufacturer or a qualified motorcycle mechanic for guidance on the appropriate lubrication method for your particular model.