Seizure occurs when the piston expands and sticks to the cylinder, stopping the engine. Lack of lubrication, a major reason for PWC engine seizure, occurs when fuel and oil are mixed in the wrong ratio, or your oil runs dry. Problems can also be caused by using cheap or non-recommended oils that do not have lubricating qualities required by PWC engines, Failures of oil injection systems are very rare. Over heating is probably the most common cause of seizures. Other possible reasons for seizures are improper tuning of the carburetor; Advanced ignition timing; lack of cooling water; air leaks (causing lean mixtures) at the carburetor or intake manifold, head or cylinder gaskets, or crankshaft seals.
The way to prevent seizures is to have your carburetor adjusted properly by a professional mechanic then leave it alone, use good oil, and make sure your water cooling system is working. (keep an eye on the bypass-water should always be flowing when the engine is running).
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