Check Carburetion; Steering Tension - Briggs & Stratton 5 HP Troubleshooting & Repair Manual

8. Slowly open the valve and note the reading on the
gauge.
9. Listen for air leaking from cylinder head gasket,
carburetor, exhaust system and either crankcase
breather or high oil fill dipstick tube.
NOTE:
If a high flow of air is leaking from exhaust
and carburetor, make sure that piston is at TDC on
compression stroke.
Reading is Green
2
Reading is Yellow, small leak
at cylinder head gasket.
Reading is Yellow/Red, mini-
mal leakage from one
component.
Reading is Red, air is leaking
from several components.
• Air flowing between cylinder and cylinder head
indicates that cylinder head gasket is leaking.
•. Air flowing from carburetor indicates air is
leaking past intake valve and seat.
• Air flowing from exhaust system indicates air is
leaking past exhaust valve and seat.
• Air flowing from crankcase breather tube or high
oil fill dipstick tube indicates air is leaking past
piston rings.
10. When test is complete, close the valve. Push the
regulator lock nut
far as it will go to release pressure in combustion
chamber.
11. Disconnect outlet hose from tester before removing
from spark plug hole.
Good Condition
Replace gasket and retest.
Look for a problem with that
component.
Check that piston is at TDC
on compression stroke. If
reading does not change,
look for problems beginning
with component that
appeared to leak the most
air. Re-test after repair.
and turn counterclockwise as
IN
5 HP Outboard • Troubleshooting & Repair Manual

Check Carburetion

Before making a carburetion check, fill the fuel tank with
fresh, clean gasoline. Be sure that the shut-off valve is
. Check to see that the choke closes completely. If
OPEN
engine will not start, remove and inspect the spark plug.
If plug is wet, look for:
• Over choking
• Excessively rich fuel mixture
• Water in fuel
• Inlet needle stuck open
• Fouled spark plug
If plug is dry, look for:
• Leaking carburetor mounting gaskets
• Dirt or gum deposits in carburetor, fuel filter, fuel
lines, transport valve or fuel tank
• Inlet needle stuck shut
• Inoperative fuel pump
A simple check to determine if the fuel is getting to the
combustion chamber through the carburetor is to remove
the spark plug and pour a small quantity of gasoline through
the spark plug hole. Replace the plug. If the engine fires a
few times and then stops, look for the same conditions as
for a dry plug.

Steering Tension

1. Steering tension is adjusted with a set screw
on the left side of the mid-section that
(Figure 20) 1
applies pressure to a friction pad. Tighten the steering
(increase steering effort) by turning the set screw
clockwise; loosen (reduce steering effort) by turning
the screw counterclockwise.
18
Section 2 • Troubleshooting