2008 Polaris Sportsman 700/800/700 X2 EFI Service Manual, Page 109Get this manual
ENGINE TROUBLESHOOTING
Engine Spark Plug Fouling
Spark plug cap loose or faulty Incorrect spark plug heat range or gap PVT system calibrated incorrectly components worn or mis-adjusted Fuel quality poor (old) or octane too high Low compression Restricted exhaust Weak ignition (loose coil ground, faulty coil, stator, or ETC switch) ETC switch mis-adjusted Restricted air filter (main or pre-cleaner) or breather system Improperly assembled air intake system Restricted engine breather system Oil contaminated with fuel
Engine Idles But Will Not Accelerate
Spark plug fouledweak spark Broken throttle cable Obstruction in air intake Air box removed (reinstall all intake components) Incorrect or restricted carburetor jetting ETC switch limiting speed Reverse speed limiter limiting speed Incorrect ignition timing Restricted exhaust system Cam worn excessively
Engine Has Low Power
Spark plug fouled Cylinder, piston, ring, or valve wear or damage (check compression) PVT not operating properly Restricted exhaust muffler Cam worn excessively