So, I had the rear wheel off the ground and put it in first gear to apply the chain lube while the wheel was spinning slowly. With wheel spinning, just as I began to spray the lube, the engine speed suddenly increased to about 2500 RPM. When I nicked the gearbox back to neutral, the idle speed went back to normal. A second attempt, and the idle speed stayed normal for the duration of lubing. Any guesses on what caused this? Injection trying to compensate for something?