If you choose not to trust your Tomos oil injector system, here is a brief How To on removing it. Just remember that you'll have to use premix from now on.
Drain and remove the oil tank, (just cut the oil line off) remove the little round cover on the left side of the engine that attaches with one screw, the pump is behind that cover. remove the 2 screws and remove the pump. Look for where the oil line attaches to the carburetor, you will either need to pull it off and cap off the fitting with a vacuum cap, or cut off the line close to the carb, leaving enough to put a plug in. There are 2 lines, one from the oil tank to the pump, and one from the pump to the carb. Removing those usually requires removing the flywheel/magneto cover, which is the part that the pump attached to. It’s not difficult, and there is no oil behind it. That’s the entire system, the tank, lines, and pump. Remember that before you can start it, you have to drain all the gas out of the tank and carb, and fill it with premix, to avoid starting it on straight gas.