AquaCraft Rio 51Z - Manual (Page 12)

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It is not necessary to change the needle settings if the engine
runs smoothly. Normally only the high-speed needle will need
adjustment from time to time and only by a small amount.
Factory carburetor settings are:
A. HSN 1-5/8 turns from the closed position (
± 1/4 turn)
B. LSN 1 turn from the closed position (
± 1/4 turn)
If you run into problems tuning your engine settings, it is best
to re-set the needles to the above settings and start over.
IDLE STOP ADJUSTMENT
The idle speed screw is used to adjust how fast the engine
runs at idle.
Once the high and low speed needles are properly adjusted
the idle speed can be set. To increase the idle speed turn the
screw in (clockwise), to slow the idle speed turn the screw out
(counter-clockwise).
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RACING
Although it is very enjoyable to run the Rio 51Z by yourself or with
a buddy, the real fun and excitement of R/C boating is experienced
when you get involved in racing. Racing against other boats is much
different than running your boat alone. The following suggestions
will hopefully provide helpful strategies when racing a model boat.
A good set-up for running alone may not be the best for racing. Race
water conditions create challenges different from running alone
and water conditions constantly change during a race. Five or six
boats racing against one another will create rough water on the race
course. To compete successfully, it may be necessary to “tighten”
the ride characteristics. This can be accomplished by adjusting the
angle of the strut or trim plates.
Wakes caused by other boats can upset the balance and ride
characteristics of even a well trimmed model boat. When running
down the straight-aways, don’t follow in another boat’s wake. Wakes
generated by other boats while entering and negotiating a corner are
especially dangerous. Cutting across a wake when entering a corner
can cause the boat to “hook” (spin out).
Racing other boats through a corner may be a competitor’s greatest
challenge, especially the fi rst corner after the start of a race. The
boat entering the corner fi rst has the task of holding its position
(often called “holding your lane”) through the corner. The trailing
boats must then attempt to hold their lanes, too.
NATIONAL MODEL BOATING ORGANIZATIONS
There are two national model boating organizations in the United
States and Canada:
IMPBA or International Model Power Boat Association
www.impba.net
NAMBA or North American Model Boat Association
www.namba.com
Each of these organizations has its own rules governing model boat
racing, sanctioned events and recognized records. Organized model
boat racing is offered at both regional and national levels. Location of
clubs, race dates and locations, membership applications, and other
information can be obtained through their respective web sites.
A good source of information regarding all aspects of model boat
operation is:
International Waters
www.intlwaters.com
MAINTENANCE
When you are through operating your boat for the day, be sure to
perform these basic maintenance procedures. This will prolong
the life of the Rio 51Z and help to ensure trouble-free running.
• Wipe down the entire boat, inside and out, with spray-on
cleaner and a paper towel. If water is left in the boat, it could
get into the engine, potentially causing the piston ring to rust.
• Leave the cowl off the boat overnight to let
any water evaporate from the hull.