2011 Polaris Ranger RZR ATV Service Manual, Page 111Get this manual
ENGINE TROUBLESHOOTING
Engine Spark Plug Fouling
Spark plug cap loose or faulty Incorrect spark plug heat range or gap PVT system calibrated incorr ctly components worn or mis-adjusted Fuel quality poor (old) or octane too high Low compression Restricted exhaust Weak ignition (loose coil ground, faulty coil, or stator) Restricted air filter (mainor pre-cleaner) or breather system Improperly assembled air intake system Restricted engine breather system Oil contaminat with fuel e
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 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
Piston FailureScoring
Lack of lubrication Dirt entering engine through cr cks in air filter or ducts Engine oil dirty or contaminated