Honda 99 Outboard Owners Manual

TAKING CARE OF UNEXPECTED PROBLEMS 
HARD STARTING OR STALLS 
AFI-ER STARTING Possible Cause Correction 
1. Check control positions. Choke OPEN (tiller-handle type). Pull choke knob to CLOSED position, 
unless engine is warm (p. 14). 
Throttle grip not in START position 
(tiller-handle type). Turn throttle grip to START (p.36). 
Fast idle lever raised (side-mount type). Leave fast idle lever OFF, unless engine 
is warm (p.39). 
2. Check fuel. 1 Fuel vent closed (portable fuel tank). 1 Open fuel tank vent...

TAKING CARE OF UNEXPECTED PROBLEMS 
HARD STARTING OR STALLS 
AFTER STARTING Possible Cause 
3. Remove and inspect spark plugs. 
Spark plugs faulty, fouled or improperly Clean, gap or replace spark plugs (p. 
gapped. 62). 
4. Take outboard motor to an authorized 
Honda Marine dealer, or refer to the 
shop manual. Carburetor malfunction, fuel pump 
failure, ignition malfunction, etc. 
Correction 
Replace or repair faulty components as 
necessary. 
ENGINE OVERHEATS Possible Cause Correction 
I. Check water...

TAKING CARE OF UNEXPECTED PROBLEMS 
BATTERY WILL NOT 
CHARGE AND 
ELECTRIC STARTER WILL 
NOT OPERATE 
The battery-charging circuit and the 
electric starter relay circuit are protected 
by the 20-ampere fuse. If the fuse bums 
out, the engine will not charge the battery, 
and the electric starter will not operate. 
The engine can be started using the recoil 
starter or the emergency starter repe. 
The ignition switch is protected by the 20- 
ampere fuse. If the fuse bums out, the 
engine will not start...

TAKING CARE OF UNEXPECTED PROBLEMS 
OIL PRESSURE INDICATOR 
LIGHT GOES OFF AND 
ENGINE SPEED IS LIMITED 
OIL PRESSURE 
(tiller handle type) (remote control type) 
If oil pressure becomes low, the green 
indicator light will go off, and the engine 
protection system will limit engine speed. 
If you arc at cruising speed, engine speed 
will decrease gradually. 
Remote-control types are equipped with a 
buzzer hat sounds when the green 
indicator light goes off. Low oil pressure may be the result of low...

TAKING CARE OF UNEXPECTED PROBLEMS 
OVERHEATING INDICATOR 
LIGHT COMES ON AND 
ENGINE SPEED IS LIMITED 
If the engine overheats, the red indicator 
light will come on, and the engine 
protection system will limit engine speed. 
If you are at cruising speed, engine speed 
will decrease gradually. 
Remote-control types are equipped with 
a buzzer that sounds when the red indicator 
light comes on. Engine overheating may be the result of 
clogged water intake screens, or there 
may be a problem with the...

TAKING CARE OF UNEXPECTED PROBLEMS 
SUBMERGED MOTOR 
A submerged outboard motor must be 
serviced immediately after it is recovered 
from the water in order to minimize 
corrosion. 
If there is a Honda marine dearship 
nearby, take the motor to the dealer 
immediately. If you are far from a 
dealership, proceed as follows: 
I. Remove the engine cover, and rinse 
the outboard motor with fresh water 
to remove salt water, sand, mud, etc. 
2. Drain the carburetors as described on 
p.72. 
3. Change the...

TAKING CARE OF UNEXPECTED PROBLEMS 
5. Pour a teaspoon of engine oil into 
each spark plug hole, then pull the 
recoil starter grip several times to 
lubricate the inside of the cylinders. 
6. Reinstall the spark plugs, and put the 
emergency stop switch clip into the 
switch. 
7. Attempt to start the engine. 8. If the engine fails to start, remove the 
spark plugs, clean and dry them, 
then 
reinstall the spark plugs and attempt 
to start the engine again. 
If the engine starts, and no 
mechanical...

TECHNICAL AND CONSUMER INFORMATION 
TECHNICAL INFORMATION 
Serial Number Locations 
Record the product identification number 
and engine serial numbers in the space 
provided on this page. You will need 
these numbers when ordering parts, and 
when making technical or warranty 
inquiries (p. 95). 
ENGINE SERIAL NUMBER 
The product identification number is 
stamped on a plate attached on top of the 
stem bracket. 
Product identification number: The engine serial number is stamped on 
the left front of the...

TECHNICAL AND CONSUMER INFORMATION 
Carburetor Modification for 
High Altitude Operation 
At high altitude, the standard carburetor 
air-fuel mixture will be too rich. 
Performance will decrease, and fuel 
consumption will increase. A very rich 
mixture will also foul the spark plugs and 
cause hard starting. 
High altitude performance can be 
improved by specific modifications to the 
carburetors. If you always operate your 
outboard motor at altitudes above 5,000 
feet (I ,500 meters), have an...

TECHNICAL AND CONSUMER INFORMATION 
Oxygenated Fuels 
Some conventional gasolines are being 
blended with alcohol or an ether 
compound. These gasolines arc 
collectively referred to as oxygenated 
fuels. To meet clean air standards, some 
areas of the United States and Canada USC 
oxygenated fuels to help reduce 
emissions. 
If you use an oxygenated fuel, bc sure it is 
unleaded and meets the minimum octane 
rating requirement. 
Before using an oxygenated fuel, try to 
confirm the fuel’s contents. Some...