Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
MMR2000_116_03_02A.FM 03-02-3
SYMPTOM ENGINE TURNS OVER BUT FAILS TO START.
CONDITION NORMAL USE.
Test/Inspection 1. Check switches.
a. Ignition switch, emergency cut-out switch or tether switch is in the OFF position.
Place all switches in the RUN or ON position.
2. Check fuel level.
a. Mixture not rich enough to start cold engine.
Check fuel tank level and use choke.
3. Check spark plug.
a. Defective spark plug (no spark).
Replace spark plug.
4. Check amount of fuel on spark plug.
a. Spark plug wet (flooded engine).
Clean and dry spark plug. Reinstall spark plug and start engine taking care not to
use choke. If flooding is severe, check carburetor float valve, then change engine
oil.
b. Spark plug dry (no fuel to the engine).
Check fuel tank level; check if fuel valve is opened: check fuel strainer, clean if
clogged ; check condition of fuel lines and their connections.
Check carburetor main jet and nozzle.
5. Check the ignition system.
a. No spark or weak spark.
Replace parts as indicated in section electrical system.
6. Check engine compression.
a. Insufficient engine compression.
Check valve clearance; carbon accumulation; defective cylinder head gasket,
valves or valve seats; Check for worn piston rings, piston or cylinder. Replace
defective part(s) (ex. : piston(s), ring(s), etc.).
7. Verify check valve on top of fuel tank.
a. Improperly installed or obstructed.
Install with vented side toward atmosphere or replace.
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