9.TROUBLESHOOTING
9-14
use new recommended oil.
Oil contamination due to clogged oil filter/oil strainer. Replace oil and oil
filter at the same time, replace defective part(s).
9. Check valve springs exhaust/intake.
Broken valve spring damages the cylinder head, valve(s), rocker arm(s),
piston, piston rings and connecting rod. Replace defective part(s).
10. Check if fuel supply is sufficient.
Low fuel level.
Clogged fuel filter or fuel injector filter.
Fuel line is contaminated and/or bent. Clean and/or replace defective
part(s).
Symptom: ENGINE BACKFIRES
1. Check spark plugs.
Carbon accumulation caused by defective spark plugs. Replace spark
plugs.
2. Check leakage on intake manifold.
Air leak on intake system. Retighten screws and/or replace intake
manifold gasket.
3. Check exhaust air leaking.
Exhaust gasket is leaking. Retighten screws and/or replace exhaust
gasket.
4. Check intake valve(s) for leaking.
Intake valve(s) is (are) leaking. Repair or replace valve(s).
5. Check if fuel supply is sufficient.
Fuel line is contaminated and/or bent (engine gets lean). Clean and/or
replace defective part(s).
6. Check engine ground.
Poor engine ground. Clean.
Symptom: ENGINE DOES NOT OFFER MAXIMUM POWER AND/OR DOES NOT REACH
MAXIMUM OPERATING RPM
1. Check spark plugs condition and/or gap.
Fouled spark plugs or wrong spark plug gap. Readjust gap and clean
spark plugs or replace.
2. Check spark plugs type.
Improper spark plugs heat range. Install recommended spark plugs (refer
to TECHNICAL SPECIFICATIONS).
3. Perform engine leak test.
Damaged head gasket and/or seal and/or leaking intake/exhaust valve(s).
To Next Page
