.18 Marine Owners Manual
Congratulations on your purchase of a
Pro Boat™ .18 Marine engine! Precision
manufactured and assembled, your
Pro Boat .18 Marine engine will provide
you with trouble-free performance if you
read and follow these instructions.
Using the Proper Fuel and Glow Plug
Using the proper fuel and glow plug is
critical in order to achieve maximum
performance and reliability. You must use
fuel and glow plugs that are specifically
designed for model car/boat applications.
Never use any type of model airplane glow
fuel! Use of model airplane fuel will damage
your engine and immediately void any
warranty.
We recommend using Blue Thunder™
or Blue Thunder Race Formula blend
fuels with 20% nitro, providing the best
combination of power and fuel economy.
Pro Boat Blue Thunder fuels are vigorously
tested, researched and formulated to deliver
excellent power as well as engine protection.
A glow plug has been included and is
ideal for breaking in your new engine. In
fact during the break-in procedure, it is
not uncommon to go through one or two
glow plugs, as microscopic bits of metal
(from the cylinder/piston wearing in) bond
themselves to the plug element causing glow
plug failure. We recommend a sport glow
plug (DYN2500) or an O’Donnell 1/10 racing
glow plug (DYN2521) as the absolute best
glow plug for this engine, delivering an ideal
balance of performance and longevity.
Carburetor Adjustments
Your Pro Boat .18 Marine engine comes
equipped with a precision rotary carburetor.
Take a moment to review the pictures below
to familiarize yourself with the various
functions of the carburetor. Loosening the
nut located on the side of the crankcase
under the carburetor body will allow you to
rotate the carburetor. Make certain to mount
the throttle arm to the side required by
your particular boat. Although preset at the
factory, some changes in the needle setting
can occur during shipping and handling. We
suggest the following settings for breaking in
your engine:
High-Speed Needle: 21/2 turns out
(counterclockwise) from closed.
Low-Speed Needle: 21/2 turns out
(counterclockwise) from closed.
When checking the adjustment of the lowspeed needle, it is crucial that the throttle
barrel is closed completely when turning
the needle and that you do not overtighten
the needle.
High-Speed
Needle Valve
Idle Adjustment
Screw
Higher Idle
Use the included screwdriver to make
this job easier. When you feel resistance
in the needle, immediately stop
turning and begin turning the needles
counterclockwise, counting the number of
turns from “closed.”
Richer
Low-Speed
Needle Valve
Leaner
Water-Cooled Engine
Because the Pro Boat .18 Marine engine
is watercooled and not air-cooled, make
sure that you do not run the engine for an
extended amount of time outside of the
water. Continuously monitor the water outlet
when the boat is running to make sure that
the water is reaching the engine head. If the
water does not reach the head to cool it, the
engine will overheat and fail. This will cause
permanent damage to the engine.
Starting Your Engine for the First Time
The Pro Boat .18 Marine engine comes
equipped with the Pro Boat Pro Mix
Carburetor. Each Pro Mix Carburetor is
pre-adjusted at the factory. This setting
should be approximately 21/2 turns open for
the high-speed and 21/2 turns open for the
low-speed needle. This should give you a
slightly “rich” mixture of fuel to the engine.
This setting is the safest way to break in
your engine.
The first start of your engine is the most
critical time of the engine’s life, dictating
how well it will perform. After installing the
engine in your model and inserting the glow
plug, turn on your radio system and attach a
glow igniter to the glow plug.
When using a recoil starter, never pull the
rope out to its full length, as doing so may
cause damage and recoil starter failure.
Quick, short pulls of the recoil starter are
the best technique to use. Never extend the
starter rope more than 12 inches.
Should the pull starter be extremely difficult
to pull (will not extend out of the assembly),
the engine may be flooded (hydro-locked).
Excess fuel between the cylinder head and
piston will not allow the piston to travel
through its full range of compression,
effectively “locking up” the engine. Should
this occur, immediately remove the glow
igniter from the plug. Using a glow plug
wrench (DYN2510), remove the glow
plug and turn the model upside down.
Give the recoil starter a few short pulls to
clear out the fuel, re-install the glow plug
and start again.
You may need to “blip” the throttle on the
transmitter (applying throttle on/off) while
trying to start the engine, as new engines are
more difficult to start due to the tight piston/
cylinder fit. Never start an engine above 1⁄4
throttle. Immediate damage to your engine
can occur!
When the engine starts, the exhaust should
emit blue/ white smoke, indicating that the
engine is excessively rich (a good thing
during break-in). During the first tank of
fuel, you may wish to set a higher than
normal idle speed and/or leave the glow plug
igniter attached in order to keep the engine
from stalling. Drive the boat around while
“blipping” the throttle and avoid operating
the engine at full throttle for more than 2–3
seconds at a time. Consume the entire first
two tanks of fuel in this manner.
After the first two tanks of fuel, begin leaning
out the high-speed needle valve 1/8 turn at
a time. It generally takes about 5 or 6 tanks
of fuel before you’d want to start tuning for
“maximum” power. Do not skip this process
of breaking in a new or rebuilt engine!
Should you choose not to follow these
procedures, you risk damaging your engine
during the first tank of fuel.
Your patience during these procedures will
be rewarded by an engine that performs
reliably and to its maximum power potential.
First run attempts can be more frustrating
than with other (less powerful) sport
engines, so take your time—it will be worth
the wait!
Glow plug failure is a common occurrence
when breaking in a new engine. To test
your plug, let the engine idle at a properly
adjusted low-speed needle setting with the
glow igniter attached. Then, remove the
igniter. If you hear no appreciable change in
engine rpm, then the plug is still good. If the
engine loads up and the rpm’s decrease, it’s
time to replace the glow plug.
Setting the Needle Valves
When adjusting the settings, always adjust
the needles in small increments, about
1/8 of a full turn at a time. Do not set
the engine too lean, as it shortens the
reliability of the engine.
After you have attained the correct needle
settings, the engine will have a strongsounding, high-pitched whine at full speed,
and a thin trail of blue/white smoke will
come from the exhaust.
An engine should not be run too lean; doing
so severely shortens the life of the engine.
When an engine is set too lean, it will run
very strong at first, but will soon begin to
sag and hesitate or stall when accelerating.
Tuning the Low-Speed Needle
The low-speed needle (also referred to as
the idle mixture or idle needle) should be
set after you’re satisfied with the high-speed
needle setting. After achieving the proper
operating temperature, reduce the engine
throttle to idle and pinch the fuel line with
your fingers close to the carb fuel inlet
nipple. If the engine dies immediately, the
lowspeed needle is set too lean. If the rpm’s
increase dramatically, the setting is too
rich. The ideal setting results in the rpm’s
increasing just a slight amount after pinching
the fuel line.
Idle Stop Adjustment
The last setting to be made is the idle
stop screw. Turning this screw clockwise
increases the idle speed; turning the screw
counterclockwise will make the engine idle at
a lower speed. Ideally, the engine should idle
just fast enough to be reliable in acceleration
and transition from idle to full speed.
Head Shims
Several head shims are added at the factory
to make the engine easier to start when
new. After break-in, you may remove all but
one of these shims to increase compression
and power.
Engine Maintenance
Periodic maintenance must be performed
in order to keep your engine in proper
operating condition. After each day of
running, it’s critical to use high quality
afterrun oil to protect the internals of the
engine and guard them against corrosion.
The methanol used in the fuel attracts
moisture that can cause corrosion
(particularly in the ball bearings). We
recommend Blue Thunder™ Final Run
(DYN2255) as it’s specifically formulated to
protect your engine between uses. Follow
these steps after running your engine:
1) Empty all fuel from the tank and fuel lines.
2) Use Final Run fuel following the
instructions on the container.
3) Clean and inspect the engine and
fuel system.
Troubleshooting Guide
Problem
Engine won’t start
Engine starts, then dies
Engine starts and runs
for 1⁄2 tank, then quits
Possible Cause/Solution
• Clogged fuel line
• Bad or improper glow
plug
• Glow igniter not
charged
• Engine flooded
• Pressure line blocked or
disconnected
• Bad glow plug
• High-speed needle too
lean
• Hole or tear in fuel line
• Bad glow plug or idle
speed set too low
• Overheated engine
(too lean)
• Improper needle
settings
Warranty
Warranty Period
Exclusive Warranty- Horizon Hobby, Inc.,
(Horizon) warranties that the Products
purchased (the “Product”) will be free from
defects in materials and workmanship at the
date of purchase by the Purchaser
Limited Warranty
(a) This warranty is limited to the original
Purchaser (“Purchaser”) and is not
transferable. REPAIR OR REPLACEMENT AS
PROVIDED UNDER THIS WARRANTY IS THE
EXCLUSIVE REMEDY OF THE PURCHASER.
This warranty covers only those Products
purchased from an authorized Horizon
dealer. Third party transactions are not
covered by this warranty. Proof of purchase
is required for warranty claims. Further,
Horizon reserves the right to change or
modify this warranty without notice and
disclaims all other warranties, express or
implied.
(b) Limitations- HORIZON MAKES NO
WARRANTY OR REPRESENTATION,
EXPRESS OR IMPLIED, ABOUT NONINFRINGEMENT, MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE
OF THE PRODUCT. THE PURCHASER
ACKNOWLEDGES THAT THEY ALONE HAVE
DETERMINED THAT THE PRODUCT WILL
SUITABLY MEET THE REQUIREMENTS OF
THE PURCHASER’S INTENDED USE.
(c) Purchaser Remedy- Horizon’s sole
obligation hereunder shall be that Horizon
will, at its option, (i) repair or (ii) replace,
any Product determined by Horizon to be
defective. In the event of a defect, these are
the Purchaser’s exclusive remedies. Horizon
reserves the right to inspect any and all
equipment involved in a warranty claim.
Repair or replacement decisions are at the
sole discretion of Horizon. This warranty
does not cover cosmetic damage or damage
due to acts of God, accident, misuse,
abuse, negligence, commercial use, or
modification of or to any part of the Product.
This warranty does not cover damage
due to improper installation, operation,
maintenance, or attempted repair by anyone
other than Horizon. Return of any goods by
Purchaser must be approved in writing by
Horizon before shipment.
Damage Limits
HORIZON SHALL NOT BE LIABLE FOR
SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES, LOSS OF PROFITS OR
PRODUCTION OR COMMERCIAL LOSS
IN ANY WAY CONNECTED WITH THE
PRODUCT, WHETHER SUCH CLAIM
IS BASED IN CONTRACT, WARRANTY,
NEGLIGENCE, OR STRICT LIABILITY.
Further, in no event shall the liability of
Horizon exceed the individual price of the
Product on which liability is asserted. As
Horizon has no control over use, setup,
final assembly, modification or misuse, no
liability shall be assumed nor accepted for
any resulting damage or injury. By the act of
use, setup or assembly, the user accepts all
resulting liability.
If you as the Purchaser or user are not
prepared to accept the liability associated
with the use of this Product, you are advised
to return this Product immediately in
new and unused condition to the place of
purchase.
Law: These Terms are governed by Illinois
law (without regard to conflict of law
principals).
Safety Precautions
This is a sophisticated hobby Product and
not a toy. It must be operated with caution
and common sense and requires some basic
mechanical ability. Failure to operate this
Product in a safe and responsible manner
could result in injury or damage to the
Product or other property. This Product is
not intended for use by children without
direct adult supervision. The Product manual
contains instructions for safety, operation
and maintenance. It is essential to read and
follow all the instructions and warnings
in the manual, prior to assembly, setup or
use, in order to operate correctly and avoid
damage or injury.
Questions, Assistance, and Repairs
Your local hobby store and/or place of
purchase cannot provide warranty support
or repair. Once assembly, setup or use of
the Product has been started, you must
contact Horizon directly. This will enable
Horizon to better answer your questions and
service you in the event that you may need
any assistance. For questions or assistance,
please direct your email to productsupport@
horizonhobby.com, or call 877.504.0233 toll
free to speak to a service technician.
Inspection or Repairs
If this Product needs to be inspected
or repaired, please call for a Return
Merchandise Authorization (RMA). Pack the
Product securely using a shipping carton.
Please note that original boxes may be
included, but are not designed to withstand
the rigors of shipping without additional
protection. Ship via a carrier that provides
tracking and insurance for lost or damaged
parcels, as Horizon is not responsible
for merchandise until it arrives and is
accepted at our facility. A Service Repair
Request is available at www.horizonhobby.
com on the “Support” tab. If you do not have
internet access, please include a letter with
your complete name, street address, email
address and phone number where you can
be reached during business days, your RMA
number, a list of the included items, method
of payment for any non-warranty expenses
and a brief summary of the problem. Your
original sales receipt must also be included
for warranty consideration. Be sure your
name, address, and RMA number are clearly
written on the outside of the shipping carton.
Warranty Inspection and Repairs
To receive warranty service, you must
include your original sales receipt verifying
the proof-of-purchase date. Provided
warranty conditions have been met, your
Product will be repaired or replaced free of
charge. Repair or replacement decisions are
at the sole discretion of Horizon Hobby.
Non-Warranty Repairs
Should your repair not be covered by
warranty the repair will be completed
and payment will be required without
notification or estimate of the expense
unless the expense exceeds 50% of the
retail purchase cost. By submitting the item
for repair you are agreeing to payment of the
repair without notification. Repair estimates
are available upon request. You must include
this request with your repair. Non-warranty
repair estimates will be billed a minimum
of ½ hour of labor. In addition you will be
billed for return freight. Please advise us of
your preferred method of payment. Horizon
accepts money orders and cashiers checks,
as well as Visa, MasterCard, American
Express, and Discover cards. If you choose
to pay by credit card, please include your
credit card number and expiration date.
Any repair left unpaid or unclaimed after 90
days will be considered abandoned and will
be disposed of accordingly. Please note:
non-warranty repair is only available on
electronics and model engines.
Electronics and engines requiring inspection
or repair should be shipped to the following
address:
Horizon Service Center
4105 Fieldstone Road
Champaign, Illinois 61822
All other Products requiring warranty
inspection or repair should be shipped to the
following address:
Horizon Product Support
4105 Fieldstone Road
Champaign, Illinois 61822
Please call 877-504-0233 with any
questions or concerns regarding this
product or warranty.
.18 Marine w/Pull Start
DYN6559
DYN6560
DYN6560
DYN6523
PRB0201
DYN6565
DYN6565
PRB0202
DYN6575
PRB0203
PRB0204
PRB0205
PRB0206
PRB0207
PRB0208
PRB0209
PRB0210
DYN6561
PRB0211
PRB0212
DYN6537
DYN6565
PRB0216
PRB0215
DYN6558
DYN6556
DYN6565
DYN6565
DYN6565
PRB0217
DYN6540
DYN6538
PRB0213
DYN6554
DYN6554
DYN6554
DYN6565
PRB0214
DYN6562
DYN6541
DYN6535
DYN6541
DYN6535
DYN6540
DYN6542
DYN6543
DYN6539
ITEM NO. DESCRIPTION
PRB0200 .18 Water-cooled Engine; Universal
DYN6523 M2.6 Head Screw (4)
PRB0201 Heat Sink Head
DYN6565 O-Ring Set
PRB0202 Head Button
PRB0203 Head Gasket (0.1mm)
PRB0204 Head Gasket (0.2mm)
PRB0205 Cylinder Piston Set
PRB0206 Wrist Pin
PRB0207 Wrist Pin Clips(2)
PRB0208 .18 PRO Connection Rod
PRB0209 Rotor Carburetor/PRB
PRB0210 Front Bearing
DYN6561 Carb. Retaining Post
PRB0211 .18 Crankcase
PRB0212 Rear Bearing
PRB0213 .18 Crankshaft
DYN6554 Throttle Arm w/ Nut
DYN6559 Low Speed Needle Valve
PRB0214 Throttle Barrel
DYN6562 Throttle Barrel Spring
DYN6560 Throttle Adjustment Screw
DYN6555 High Speed Needle Valve
DYN6556 High Speed Needle Holder
DYN6558 Inlet Nipple
PRB0215 Carburetor Body
DYN6535 Pull Starter Front parts
DYN6541 PS Handle
DYN6535 Pull Starter Rear Cover
DYN6540 Pull Starter Screw Set
DYN65442 PS Recoil Spring
DYN6543 PS Rope/Pulley
DYN6539 PS Cushion Spring
PRB0216 Pull Starter Rear parts
DYN6537 One-Way Bearing
PRB0217 Backplate
DYN6538 PS Shaft
© 2007 Horizon Hobby, Inc.
Pro Boat engines are manufactured in
Taiwan and distributed worldwide by:
Horizon Hobby, Inc.
4105 Fieldstone Rd.
Champaign, IL 61822
www.horizonhobby.com
10442
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