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Section 03
ENGINE
Subsection 02
(TROUBLESHOOTING)
VMR2004_006_03_02A.FM
03-02-11
SYMPTOM
ENGINE DOES NOT OFFER MAXIMUM POWER AND/OR DOES NOT REACH
MAXIMUM OPERATING RPM.
CONDITION
NORMAL USE.
Test/Inspection
1. Check items of ENGINE SUDDENLY TURNS OFF.
2. Check air intake system.
a. Air filter is clogged due to contamination.
Replace air filter.
3. Check spark plug condition and/or gap.
a. Fouled spark plug or wrong spark plug gap.
Readjust gap and clean spark plug or replace.
4. Check spark plug type.
a. Improper spark plug heat range.
Install recommended spark plug (refer to TECHNICAL DATA).
5. Perform engine leak test. Refer to ENGINE LEAK TEST procedure. Check for
possible piston seizure.
a. Damaged head gasket and/or seal and/or leaking inlet/exhaust valve(s).
Replace and/or repair defective parts.
6. Check for water in fuel or contaminated fuel by other products (kerosene,
diesel, etc.).
a. There is water in fuel or contaminated fuel.
Drain fuel system, search for leakage and refill it with appropriate fuel.
7. Check engine compression.
a. Worn piston(s) and/or piston ring(s).
Replace (refer to CYLINDER AND HEAD).
SYMPTOM
ENGINE TURNS OVER BUT FAILS TO START.
CONDITION
NORMAL USE.
Test/Inspection
1. Check if single-spark ignition coil fits on spark plug (refer to ENGINE DOES NOT
START-NO SPARK AT SPARK PLUG).
2. Check spark plug.
a. Define spark plug (no spark) or wrong spark plug gap.
Readjust gap and clean spark plug or replace.
3. Check for fuel on spark plug.
a. Flooded engine (spark plug wet when removed).
Do not overchoke. Remove wet spark plug, turn ignition switch to OFF and crank
engine several times. Install clean dry spark plug. Start engine following usual
starting procedure.
4. Check engine compression.
a. Insufficient engine compression.
Replace defective part(s) (ex.:piston, ring(s), etc.).
5. During cold weather check engine decompressor (located on camshaft).
a. Centrifugal weight spring is not engaged and/or damaged.
Readjust spring or replace centrifugal weight if damaged.
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