Engine seizure means that the engine locks or freezes, and it has the same result as a locked rear wheel. However, there is usually some advance warning, giving you time to respond.
Engine seizure is caused by overheating or lack of lubrication. Without oil, the engine’s moving parts will no longer move smoothly against each other, and the engine will overheat. The first symptom may be a loss of engine power. You may also notice a change in the engine’s sound.
If your engine starts to seize, squeeze the clutch lever, disengaging the engine from the rear wheel. Pull off the road to the shoulder and stop. Let the engine cool. While you may be able to add oil and restart the engine, it should be thoroughly checked for damage.