Checking Fuel System - Yamaha 40V Owner's Manual

Maintenance
place the spark plug with another of the cor-
rect type.
Standard spark plug:
40VEO B7HS-10
40VETO B7HS-10
40VMHO B7HS-10
40YETO BR8HS-10
40YMHO BR8HS-10
50HEDO B8HS-10
50HETO B8HS-10
50HMHO B8HS-10
40VEO BR7HS-10
40VETO BR7HS-10
40VMHO BR7HS-10
40YETO BR8HS-10
40YMHO BR8HS-10
50HEDO BR8HS-10
50HETO BR8HS-10
50HMHO BR8HS-10
Before fitting the spark plug, measure the
electrode gap with a wire thickness gauge;
adjust the gap to specification if necessary.
1. Spark plug gap
2. Spark plug I.D. mark (NGK)
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
When fitting the plug, always clean the gas-
ket surface and use a new gasket. Wipe off
58
any dirt from the threads and screw in the
spark plug to the correct torque.
Spark plug torque:
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)
NOTE:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past fin-
ger-tight. Have the spark plug adjusted to the
correct torque as soon as possible with a
torque-wrench.
EMU28962

Checking fuel system

EWM00060
WARNING
Gasoline and its vapors are highly flam-
mable and explosive. Keep away from
sparks, cigarettes, flames, or other
sources of ignition.
EWM00910
WARNING
Leaking fuel can result in fire or explo-
sion.
Check for fuel leakage regularly.
G
If any fuel leakage is found, the fuel
G
system must be repaired by a qualified
mechanic. Improper repairs can make
the outboard unsafe to operate.
Check the fuel lines for leaks, crack, or mal-
function. If a problem is found, your Yamaha
dealer or other qualified mechanic should re-
pair it immediately.