1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 132Get this manual

1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 132

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FUEL SYSTEMCARBURETION Fuel Pump Operation Fuel Pump Operation, Keihin

When the piston is on its downstroke, the pressure from the crankcase becomes positive causing the diaphragm to move