High RPMs = jet unit problem. Higher than normal RPMs lack of thrust, slipping clutch feel, engine racing and no go?
• Blockage: The most common problem is weeds and stones blocking the intake gate. Also be aware of ski rope, fishing line plastic bags winding around the pump shaft. Small sticks and stones can become lodged in the impeller affecting the performance dramatically; objects trapped in the impeller can cause the rotating assembly to be out of balance, causing severe vibration. Make sure the water passage through the jet is clear. • Impeller wear: The heart of the jet is the impeller, and its condition. If you run in shallow gravel beds or across sand bars the leading edges will become dull and inefficient. Pumping sand will increase the wearing to impeller clearance, causing cavitation and loss of performance. • Bowl / stator vanes: Its not too much of a problem, but the leading edge of the fixed stator vanes can become blunt and damaged. • Air Leaks: If excessive air leaks into the intake ahead of the impeller, the jet unit will “slip”. Possible sources of air leaks are through a faulty g
