Table 4-2. Organizational Troubleshooting
TEST OR INSPECTION
ENGINE WILL NOT START.
Check for defective manual recoil starter.
If starter is defective, replace starter.
If starter is not defective, proceed
Check for fouled spark plug.
to step 2.
If spark plug is fouled, replace spark plug.
Be sure plug has gap of 0.030 inch (.75mm). Before installing,
check for adequacy of spark by attaching spark plug lead and laying
plug on cylinder head.
Pull recoil starter and observe spark at
If no spark or weak spark is observed, refer to direct
If spark is seen, proceed to step 3.
Check for clogged needle jet.
Remove jet nut at base of carburetor bowl and inspect for deposits
of gum and varnish. Soak jet in solvent.
A varnish brush (item 1,
Appendix E) may be helpful in removing deposits. Clean jet and
Check for stuck carburetor float and/ or needle.
Remove carburetor bowl.
Inspect float and needle for excessive
wear or fuel deposits.
If float is worn at hinge pin, notify direct
support maintenance (refer to page 4-22).
If water is
If water is
for water or ice in carburetor bowl.
present, clean bowl, check jet is not clogged.
not present, refer to direct support maintenance.
for defective/clogged fuel pump.
Prime carburetor and disconnect fuel line at
fuel line into a container.
Start engine and
If fuel flow is not steady, use the following
isolate fuel system problem.
observe fuel flow.