Section 03
ENGINE
Subsection 02
(TROUBLESHOOTING)
03-02-18
VMR2004_125_03_02A.FM
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. Check engine compression and 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.
b. Worn piston and/or piston ring(s).
Replace (refer to CYLINDER AND HEAD).
6. Check for water in fuel (wrong fuel).
a. There is water in fuel or wrong fuel.
Drain fuel system, search for leakage and refill it with appropriate fuel.
7. Check drive belt/CVT condition.
a. Worn belt.
Replace belt if width is less than specified (refer to CVT).
SYMPTOM
HIGH ENGINE OPERATING TEMPERATURE.
CONDITION
NORMAL USE.
Test/Inspection
1. Check if cooling system shows any failure (see COOLING SYSTEM).
a. System is leaking.
Repair and/or replace damaged part(s).
2. Check condition and heat range of spark plug.
a. Melted spark plug tip or inadequate heat range.
Install recommended spark plug (refer to TECHNICAL DATA).
3. Check air inlet and outlet of the CVT cover.
a. Air circulation is clogged (overheating).
Clean air circulation from contamination.
b. Drive belt worn and/or damaged.
Replace belt with an appropriate drive belt (refer to TECHNICAL DATA).