2009-2010 Polaris RZR Factory Service Manual, Page 79Get this manual
ENGINE Combustion Chamber
1Clean all accumulated carbon deposits from combustion chamber and valve seat area with carbon cleaner and soft plastic scraperNOTE: Valve seat width and point of contact on the valve face is very important for proper sealingThe valve must contact the valve seat over the entire circumference of the seat, and the seat must be the proper width all the way aroundIf the seat is uneven, compression leakage will resultIf the seat is too wide, seat pressure is reduced, causing carbon accumulation and possible compression lossIf the seat is too narrow, heat transfer from valve to seat is reducedThe valve may overheat and warp, resulting in burnt valves
IMPORTANT: Do not use wire brush, metal scraper, or abrasive cleaners to clean the bottom of the cylinder headExtensive damage to the cylinder head may resultWear safety glasses during cleaning