Suzuki RA410 Manual page 258

6-14 ENGINE
Condition
Excessive engine oil
consumption
Low oil pressure
Engine noise
Note: Before check-
ing the mechanical
noise, make sure
that:
Ignition timing is
properly adjusted.
Specified spark
plug is used.
Specified fuel is
used.
Possible Cause
Oil entering combustion chamber
Sticky piston ring
Worn piston and cylinder
Worn piston ring groove and ring
Improper location of piston ring gap
Worn or damaged valve stem seal
Worn valve stem
Improper oil viscosity
Malfunctioning oil pressure switch
Clogged oil strainer
Functional deterioration of oil pump
Worn oil pump relief valve
Excessive clearance in various sliding parts
Valve noise
Improper valve lash
Worn valve stem and guide
Weak or broken valve spring
Warped or bent valve
Loose camshaft housing bolts
Piston, ring and cylinder noise
Worn piston, ring and cylinder bore
Connecting rod noise
Worn crankpin bearing
Worn crankpin
Loose connecting rod nuts
Low oil pressure
Crankshaft noise
Low oil pressure
Worn crankshaft journal bearing
Worn crankshaft journal
Loose lower crankcase
(bearing cap) bolts
Excessive crankshaft thrust play
Reference Item
Piston cleaning in SECTION 6A4.
Cylinders, pistons and piston
ring inspection in SECTION 6A4.
Piston and piston ring inspection in
SECTION 6A4.
Piston installation in SECTION 6A4.
Valve and cylinder head in SECTION
6A4.
Valve inspection in SECTION 6A4.
Engine oil and oil filter change in
SECTION 0B.
Oil pressure switch inspection in
SECTION 8.
Oil pan and oil pump strainer
cleaning in SECTION 6A4.
Oil pump in SECTION 6A4.
Oil pump in SECTION 6A4.
Valve lash in SECTION 6A4.
Valve inspection in SECTION 6A4.
Valve spring inspection in SECTION
6A4.
Valve inspection in SECTION 6A4.
Camshaft in SECTION 6A4.
Piston and cylinder inspection in
SECTION 6A4.
Crankpin and connecting rod
bearing inspection in SECTION 6A4.
Crankpin and connecting rod
bearing inspection in SECTION 6A4.
Connecting rod installation in
SECTION 6A4.
Previously outlined.
Previously outlined.
Crankshaft and bearing inspection
in SECTION 6A4.
Crankshaft and bearing inspection
in SECTION 6A4.
Crankshaft installation in SECTION
6A4.
Crankshaft inspection in SECTION
6A4.