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What is the function the power valve serbo motor waverunner xl800

Serbo motor wave runner

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I just purchased a used 2001 Yamaha XL800 waverunner

Yes. Those are called power valves. The purpose of those valves is they create a variable height on the exhaust ports. This is desirable because it gives you good low RPM power by keeping the height of the exhaust port low, and as the revs of the engine build, the exhaust valves raise up which opens the exhaust port up and allows the engine to create more peak HP due to the higher exhaust port and larger area of the exhaust port.
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