Suzuki RA410 Manual page 246

6-2 ENGINE
Throughout this manual, the four cylinders of the engine are
identified by numbers: No.1 (1), No.2 (2), No.3 (3) and No.4 (4)
as counted from the crankshaft pulley side to the flywheel side.
GENERAL INFORMATION ON ENGINE
SERVICE
THE FOLLOWING INFORMATION ON ENGINE SERVICE
SHOULD BE NOTED CAREFULLY, AS IT IS IMPORTANT IN
PREVENTING DAMAGE, AND IN CONTRIBUTING TO RELI-
ABLE ENGINE PERFORMANCE.
When raising or supporting engine for any reason, do not use a
jack under oil pan. Due to small clearance between oil pan and
oil pump strainer, jacking against oil pan may cause it to be bent
against strainer resulting in damaged oil pick-up unit.
It should be kept in mind, while working on engine, that 12-volt
electrical system is capable of violent and damaging short cir-
cuits.
When performing any work where electrical terminals could
possibly be grounded, ground cable of the battery should be dis-
connected at battery.
Any time air cleaner, air intake hose, throttle body or intake man-
ifold is removed, the intake opening should be covered. This will
protect against accidental entrance of foreign material which
could follow intake passage into cylinder and cause extensive
damage when engine is started.
When disconnecting couplers, don't pull wire harness but make
sure to hold coupler itself. With lock type coupler, be sure to un-
lock before disconnection. Attempt to disconnect coupler with-
out unlocking may result in damage to coupler. When
connecting lock type coupler, insert it till clicking sound is heard
and connect it securely.