132
FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
REPEATED SPARK PLUG
FOULING
Wrong spark plug type Replace with correct spark plug
Wrong spark plug gap Check and adjust if required
Faulty magneto Check and replace if required
Excessive ring blow by Check/replace rings
Poor quality gasoline Use correct fuel, check bulk storage tank
for proper storage and handling
Air leak allowing dirt to enter system Repair
Choke sticking closed Repair
Wrong main jet for conditions (high altitude
operations)
Replace with correct altitude jet for
conditions
CARBURETOR FLOODS ENGINE
Inlet valve/seat dirty Clean or replace
Fuel contamination Clean fuel system/carburetor
Incorrect float level Adjust
Clogged air filter element Clean or replace
EXCESSIVE SMOKING
Wrong oil weight Replace with recommended oil
Dirty oil Change
Crankcase overfilled with oil Drain and fill to recommended level
Clogged PCV valve Replace
Piston rings worn or broken Replace
Valves worn Replace
Valve seals or valve guides worn Replace
BACKFIRING
Accelerator limit switch out of adjustment Adjust
Loose muffler or leaking gasket Repair
Carburetor throttle lever motion restricted Repair
Carburetor throttle lever not closing fully Adjust
Throttle stop preventing throttle from clos-
ing fully
Adjust
Incorrect adjustment of accelerator,
governor and carburetor linkages
Adjust
Carburetor throttle lever shaft bent Replace or rebuild carburetor
Faulty plug wire Replace
Faulty magneto Replace
Condition Possible Cause Correction
To Next Page
Loading...
Need help?
General
