2000 Polaris Virage TX, SLX, Pro 1200, Genesis, Genesis FFI Personal Watercraft Service Manual, Page 58Get this manual
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MAINTENANCEITUNE UP Troubleshooting
Rich Fuel Mixture
Symptoms: Fouled spark plugs; black sooty exhaust; rough idle, idle unstable; poor fuel economy; rough running ("four cycling"); misses; poor performance; bogs; loads up; backfires (plug fouling) Thermostatpopoff leak, dirty or damaged Carburetor mixture needles damaged or adjusted incorrectly Needle and seat damaged Misuse of choke Fouled spark plugs Fuel pump diaphragm damaged (ruptured) Carburetor synchronization incorrect Needle and seat control arm too high or sticking Collapsed exhaust hose or pipe (restricted) Air intake restricted Broken, cracked or poorly sealing reed valve Low compression Ignition problem Anti-siphon valve worn or broken Weak spark from fouled, defective, worn or wrong spark plugs Broken reed petals Lean fuel mixture Poor quality, low octane gasoline Incorrect ignition timing Spark plug heat range too high Weak spark Incorrect fuel or fuel mixture Water in fuel system or oil tank Fuel filter restricted Jet intake clogged Cooling system clogged