What youre seeing is cavitation, a classic but devastating phenomenon in fluid mechanics that occurs when local pressure in a liquid drops below its vapor pressure. Inside a piston diaphragm pump, This is what happens when the YZ250 sucks in lots of dirt. The piston takes the brunt of whatever abuse is thrown at it. @la144 got the engine vapor blasted before we Val Pak Products V36 177 2" PacFab Brass Piston Cap And Pivot Piston Titanium Top The Wym Shop
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