2001 Polaris SLX, PRO 1200, Virage TX, Genesis, Virage TXi, Genesis i Personal Watercraft Service Manual, Page 72Get this manual
lVIaintenance General TroubleshootingContinued
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 Symptoms: Engine backfires Weak spark from fouled, defective, worn or wrong spark plugs Broken reed petals Symptoms: Engine "pinging" or "knocking" Lean fuel mixture Poor quality, low octane gasoline Incorrect ignition timing Spark plug heat range too high Symptoms: Engine power loss Weak spark Incorrect fuel or fuel mixture Water in fuel system or oil tank Fuel filter restricted Jet intake clogged Cooling system clogged Symptoms: Engine noise Detonation (see causes for holed or eroded pistons, this section) Excessive piston clearance Exhaust leak, loose exhaust pipe or muffler (water box) Engine mounts or mount plate loose or rubber mounts broken Drive coupler splines dry Driveshaft runout excessive Driveshaft end play incorrect; rubber dampers worn or missing Broken ring or ring land Oil pump bushing end play excessive Ignition timing incorrect Piston pin damaged or bent Connecting rod bearing failure (small end or big end) Crankshaft main bearing failure or wear Flywheel loose