1975 Evinrude 2HP Model 2502 Full Factory Service Manual, Page 16Get this manual
TROUBLE CHECK CHART
TROUBLE
lMOTOR WILL NOT -START
POSSmLE CAUSE AFUEL SYSTEMSee Section Fuel shut- off valve not opened Fuel vent cap not open Speed control not advanced (throttle closed) Engine flooded Old fuel Clogged fuel filter Choke not closing completely Fuel system faulty BIGNITION SYSTEMSee Section Cam or linkage improperly adjusted Inverted breaker cam Sheared flywheel key Ignition system faulty APOWER HEADSee Section Carburetor and magneto not synchronized Air leak at manifold gasketswarped manifold (backfires) Broken leaf valves (backfires) Excessive carbon on pistons and cylinder head Stuck piston rings, or scored cylinder, or piston BCARBURETORSee Section Poor fuel mixtoo much lubricant (oil) Carburetor adjustment(too leanbackfires) (too richexcessive fuel) Choke not operating properly Air leaks at packing nuts or core plugs Inlet needle and eat worn or sticky Boss gasket damaged Incorrect carburetor float setting Altitude horsepower loss CFUEL TANKSee Section Faulty fuel line Fuel tank or filter plugged Fuel line restricted Fuel vent not open Fuel shut-off valve restricted DEXHAUST GAS ENTERING CARBURETORSee Section Exhaust cover screws leaking Cover plate gasket damaged Exhaust relief obstructed Lowe bearing housing gasket leaking