2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 37Get this manual
MAINTENANCE Spark Plug InspectionInstallation 1Inspect electrodes for wear and carbon buildupLook for sharp outer edge with no rounding or erosion of the electrodesClean with electrical contact cleaner or glass bead spark plug cleaner onlyCAUTION: wire brush or coated abrasive should not be usedMeasure gap with wire gaugeRefer to specifications in the following illustration for proper spark plug type and gapAdjust gap if necessary by carefully bending the side electrodeSpark Plug Gap
EngineChassis Ground
Periodically inspect the electrical ground cable attachmentsCables and connections should be tight and corrosion-freeInspect the battery-to-chassis connection underneath the seatThis connection allows the chassis to provide ground path3