Yamaha EF2200iS, Service Manual

Page: 120 / 162

ENGINE DOES NOT START
6-4
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TR
OUBLESHOO
TING
ENGINE DOES NOT START
IGNITION SYSTEM
The ignition system fails to operate (no spark or intermittent spark).
OTHER TROUBLES
ENGINE STARTS BUT STALLS
No. Checking steps Possible remedy
1
Check the spark plug.
(Refer to “SPARK PLUG” on page 2-14)
Re-gap or replace the spark plug.
2
Check the ignition spark gap.
(Refer to “CHECKING THE IGNITION SPARK GAP” on
page 5-8)
If the ignition spark gap is OK, the igni-
tion system is OK.
3
Check the spark plug cap resistance.
(Refer to “CHECKING THE SPARK PLUG CAP RESIS-
TANCE” on page 5-9)
Replace the spark plug cap.
4
Check the CDI magneto.
(Refer to “CHECKING THE CDI MAGNETO RESISTANCE”
on page 5-10)
Replace the CDI magneto.
5
Check the entire ignition system’s wiring.
(Refer to “CIRCUIT DIAGRAM” on page 5-1) Properly connect or repair the ignition
system’s wiring.
No. Checking steps Possible remedy
1 Check the fuel level. Add the fuel if it is insufficient.
2 Check if the fuel tank strainer is clogged. Clean or replace.
3 Check if the fuel hoses are clogged. Clean.
4
Check if there is air suction from the carburetor assembly
joint, gasket, or throttle shaft.
• Tighten the carburetor assembly nuts
securely.
• Replace the carburetor assembly joint
or gasket with a new one.
5
Measure the valve clearance.
(Refer to “ADJUSTING THE VALVE CLEARANCE” on
page 2-21)
Adjust the valve clearance.
6
Check the compression pressure.
(Refer to “MEASURING THE COMPRESSION PRES-
SURE” on page 2-23)
Too high:
Decarbonize the combustion chamber if
there is carbon deposits.
Too low:
Next checking steps.
7
Check if there is seizure, wear, or damage on the piston,
piston ring, or cylinder.
(Refer to “PISTON, CONNECTING ROD, CRANKSHAFT
AND CRANKCASE” on page 3-33)
Rebore or replace.
8
Check the throttle control motor.
(Refer to “CHECKING THE THROTTLE CONTROL
SYSTEM” on page 5-15)
Replace the throttle control motor.