1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 337Get this manual
ENGINES Stroke Engine Troubleshooting Condition Engine turns over but does not start Possible Cause -No fuel -Dirt in fuel line or filter -Fuel will not pass through on-off valve (petcock) -Tank vent plugged -Carb starter circuit -Engine flooded Action -Add fuel as required -Clean line, replace filter -Clean or replace valve as necessary -Repair vent system -Clean or replace as needed -Turn off fuel and drain crankcase aInspect carb venting system for obstructions bInspect carb needle and seat aInspect head gasket bInspect piston and cylinder (repair as required) -Repair ignition system (refer to ignition troubleshooting -Charge or replace battery (refer to battery testing) -Repair starter (refer to starter testing) -Repair engine as required -Clean or replace pilot jet -Adjust as per specification -Adjust choke as per specification -Repair engine as required -Repair crankcase as required -Replace cable -Clean or repair air intake -Jet as per jetting chart -Repair ETC (refer to ETC troubleshooting) -Repair reverse speed limiter (refer to reverse speed limiter troubleshooting chart) -Check and adjust ignition timing -Repair or replace exhaust system -Repair cylinder and piston as needed -Clean, repair or replace as required -Repair or replace exhaust system -Fill oil tank and bleed pump -Check pump for proper operation -Repair engine, install fan if necessary -Clean carb and jet as per chart -Repair as needed -Use 87 octane minimum -Adjusttiming as per specifications -Install recommended spark plug -Repair cylinder (Check air filter and air box) -Synchronize pump to carb (refer to oil pump bleeding and adjustment) -Lubricate or replace cable -Retorque cylinder head -Inspectreplace head gasket -Inspect cylinder -Inspectreplace gasket -Replace