2009-2010 Polaris RZR Factory Service Manual, Page 34Get this manual
MAINTENANCE Engine Breather Hose Inspection
The engine is equipped with breather hoseInspect the breather hose for possible kinks or wearThe hose is form fitted for proper fitFollow the breather hose from the side of the airbox to the engine valve coverA smooth idle generally indicates good compressionLow engine compression is rarely factor in running condition problems above idle speedA cylinder leakdown test is the best indication of engine conditionFollow manufacturer's instructions to perform cylinder leakage test (never use high pressure leakage testers, as crankshaft seals may dislodge and leak)Cylinder Compression 800: 150-170 PSI 800 HO: 165-185 PSI Cylinder Leakdown Service Limit 15 (Inspect for cause if test exceeds 15)