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Exhaust Fumes!
Hull exhaust from your boat can cause exces-
sive accumulation of poisonous carbon mon-
oxide gas within cockpit areas when using pro-
tective weather coverings (while underway or
while stationary). Provide adequate ventilation
when the canvas top, side curtains and/or back
(aft) curtains are in their closed protective po-
sitions. (See Preface for actual warning label
regarding carbon monoxide and weathering
cover/canvas.)
4. Opening and closing ports, hatches, doors, and win-
dows may raise or lower CO levels on board a boat.
See Figures B12 and B13.
Figure B12: Desired air flow through the boat.
Figure B13: The effect of canvas configurations.
K. Cabin Appliances
Boats having fuel burning appliances in accommodation
areas should be provided with adequate ventilation and
maintained to function properly.
L. Air Conditioning
It may be possible for carbon monoxide to be brought
into the air conditioned space by the air conditioner. If
installed, please refer to the air conditioner
manufacturer's literature for additional information.
Vista 248/268 Owner's Manual
03/00
M. Ventilation of Accommodation Spaces
Accommodation spaces need to be ventilated to intro-
duce fresh air into the spaces. Ventilation method; e.g.
windows, hatches, doors, and blowers; used to accom-
plish this may, under certain conditions, bring hazard-
ous levels of CO into the accommodation spaces. Care
should be taken to be aware of all prevailing conditions
when using these ventilating methods.
N. Altitude and Sea Conditions
Changes in altitude greater than 5,000 feet contribute to
inefficient engine performance and may require adjust-
ments to the ignition systems, fuel systems, or changing
the propeller's size.
1. Failure to make adjustments to ignition systems, fuel
systems, and propeller size may cause an increase
in CO production.
2. Heavy sea conditions tend to load engines resulting
in reduced performance and thereby increasing their
CO production.
O. Portable Generator Sets
Gasoline powered portable generators are available in
the marine market place and are not an option available
through Four Winns®. Portable generators will produce
CO. These sets discharge their exhaust products in lo-
cations which can lead to an increase in the accumula-
tion of carbon monoxide in the accommodation space.
This equipment is not recommended for use on Four
Winns® boats.
P. Maintenance - Engine Performance
Efficient engine performance is vital to minimizing CO
production. The following items are those considered to
have the greatest effect on increased CO production:
1. Fuel Systems - Fuel that is contaminated, stale or
incorrect octane number.
2. Carburetors/Injectors
a. Dirty or clogged flame arrester.
b. Malfunctioning automatic choke plate or faulty
adjustment of manual choke plate.
c. Worn float needle valve and seat.
Section B
Page 8
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