Dynamite Specialty Products 15S User Manual

®

Dynamite .15S Water-Cooled

Engine

Instruction Manual

Thank you for purchasing the Dynamite .15S marine engine. We are
confident that you will enjoy many hours of exciting R/C boating
action with this engine as your power plant. Please read the
instructions carefully in order to get the most out of your
Dynamite Engine.

Water-Cooled

Because your Dynamite .15S engine is water-cooled, make sure
that you do not run the engine for an extended period of time out­side of the water. Also, continually monitor the water-outlet while
operating to make sure that the water continues to circulate
through the cylinder head. If the tubing gets clogged or for some
other reason prohibits the water from circulating through the
cylinder head, the engine will overheat and fail. This could cause
permanent damage to the engine. It is very important that you

properly hookup the water pickup line to the engine to provide
the necessary cooling.

Double Taper Piston/Sleeve

Your Dynamite .15S Engine features a double-taper piston and
sleeve. Each piston and sleeve is hand matched. Replacement
piston and sleeves are sold as a set since you never want to
replace just the piston or the sleeve individually.

Crankcase Porting

Your Dynamite .15 Engine has a third port that is machined into
the crankcase to significantly enhance the intake flow, resulting in
more horsepower.

Crankshaft Balancing

The .15S provides a well-balanced crankshaft, which offers a
smoother running and more efficient engine and will help create
more horsepower and reliability.

Section 1: Using the Proper Fuel and Glow Plug

To achieve reliability and proper tuning of any 2-cycle model
engine, it is highly recommended that you use fuel and glow
plugs that are specially designed for these types of engines.
Do not use any type of airplane glow fuel. We recommend using

Blue Thunder

TM

First Run Break-In Fuel for the first six tanks of
running. This fuel will ensure maximum life of your new and/or
rebuilt engine. After proper break-in, switch to Blue Thunder
regular fuel or Blue Thunder Race Formula blend. These fuels are
vigorously researched and specifically formulated for excellent
power and engine protection. Blue Thunder—the #1 car fuel
in America!

The Dynamite MC-59 McCoy Power Plugs (DYN2508) will provide
the best performance and longevity for your engine.

Section 2: Pro Mix Carburetor

Your .15S comes equipped
with the Dynamite Pro Mix
Carburetor. Each Pro Mix
Carburetor is preadjusted
to make starting easier.
This setting should give
you a "rich" mixture of
fuel to your engine. This
setting is approximately
2 turns open for the high­speed and 7 turns open
for the low-speed needle.

If you have difficulty
starting your engine,
check the factory setting. When checking the number of turns the
high-speed needle is open, screw the needle clockwise (leans out
the fuel mixture) using a straight tip Tuning Screwdriver
(DYN2775) and count the number of complete revolutions of the
needle until it stops turning. (Do not tighten down on the needle
valve.) Then unscrew the needle valve (counterclockwise, giving
more fuel to the engine) 2 turns before attempting to start the
engine again.

When checking the low-speed needle, it is critical that the
throttle barrel is closed when screwing in the low-speed needle
and that you don’t over-tighten the needle. Use the same proce-

dure above for checking the low-speed needle.

Section 3: Breaking in Your Engine

The first start-up of your engine is the most critical moment of
your engine’s life, dictating how it will perform from that time
forward. Turn on the radio system and attach a glow driver
(DYN1925-DYN1950) to the glow plug. Start the engine with the
pull starter that is included on your engine.

Note: When using the pull-start of your engine, never pull the
rope out to its full length, as doing so may cause damage and
the rope may not retract. Quick, short pulls of the starter rope
are the best technique to use with the pull starter.

If the pull starter is very hard to pull (i.e., it will not extend out of
the pull starter assembly), the engine may be hydro-locked.
Excessive fuel between the head and piston will not let the piston
travel to TDC (Top Dead Center). Loosen the plug one turn and try
to start the engine. If the engine starts, retighten the plug with
the attached glow driver while the engine is running. If the engine

does not start, refer to the Troubleshooting Guide in the manual.
You may have to "blip" the throttle on the transmitter (applying
throttle on/off) while trying to start the engine. New engines are
harder to start because of the tight piston/sleeve fit. Never start

an engine to full throttle. Over-revving an engine will cause pre­mature wear and breakage.

When the engine starts, the muffler should emit excessive
white/blue smoke, and the engine should be rich to such an extent
that it is not providing horsepower or idling smoothly.

During the first tank of fuel, advance the idle via the idle adjust­ment screw more than normal to prevent stalling at idle due to the
rich fuel mixture for break-in.

For the break-in period, we recommend a slightly rich low-speed
needle setting and a very rich high-speed needle setting for the
first few tanks. Again, if the engine does not start after several
tries, refer to the Troubleshooting Guide or call the Horizon
Service Center at [phone].

After you get the engine started, drive your boat around varying
the throttle of your transmitter on and off through one tank of
fuel, making sure that the engine is rich. Make sure that you do

not travel too far from shore at this time, as it may be neces­sary to retrieve it if the engine dies.

After two or three tanks of fuel, start leaning out the high-speed
needle 1/16" at a time. It generally takes about five to six tanks
before you want to lean out the engine until it supplies good
power. Do not skip this process of breaking in the engine.

If you do not follow this procedure, you could cause damage to
your engine.

Remember, be patient during your first start-ups and runs. With a
high-performance engine like the .15S, first run attempts can take
some time. Once you are through the break-in process, your
patience will be rewarded. You will have an engine that is easier to
start, tunes more consistently, and has more power.

Note: It is common for an ABC engine to go through a glow plug
or two during break-in. To test the plug, let the engine idle at a
properly adjusted low-speed needle setting with the glow driver
on. Then remove the glow driver. If the plug is good, you will not
hear a rpm change in the engine. If the engine loads up and the
rpm falls off, the glow plug will need to be replaced.

Section 4: Setting the Needle Valves

When adjusting the needle valves for maximum performance,
adjust the needles in small increments, just 1/8 of a full turn at
a time.

The worst thing you can do is to run the engine too lean—doing so
shortens the reliability of the engine. When the engine is set too
lean, it will run strong at first but will then sag, hesitate, or stall
when accelerating.

Tuning the High-Speed Needle

To check the high-speed needle, start the engine and run the boat
in the water for 1-2 minutes. Then bring the boat back in shore.

Place a few drops of water on the head. If the water immediately
evaporates, the setting is too lean. If it takes about 3-5 seconds
before the water evaporates, the settings are correct. If the water
stays on the head longer than 5 seconds without evaporating, set
the boat back in the water and run it for an additional 1-2 minutes.
If you repeat this procedure and the water is still not evaporating
within 3-5 seconds, the setting is too rich. To lean out the engine,
simply turn the high-speed needle clockwise 1/8 of a turn and run
the engine again. Continue doing this until the high-speed needle is
set correctly.

Tuning the Low-Speed Needle

It is best to tune the low-speed needle after setting the high-speed
needle. When you have achieved the proper operating temperature,
idle the engine and pinch the fuel line with you fingers at the fuel
inlet nipple of the carburetor. If the engine dies immediately, the
low end is set too lean. When you pinch the fuel line, the rpm
should increase for about 4 seconds, and then the engine should
die. To achieve the correct setting, always adjust the needle only
1/16 of a full turn, then test it before continuing.

After you have attained the correct needle settings, the engine will
have a strong sounding, high-pitched whine at full speed. A thin
trail of whitish smoke will be seen coming from the exhaust.

Idle Adjustment

The last setting on your engine is the idle screw. To obtain a higher
idle, turn the idle screw clockwise; for lower idle, turn the idle screw
counterclockwise.

Section 5: Engine Maintenance

To ensure that your engine maintains its high performance and reli­ability, periodic maintenance must be performed. After each day’s
use of the engine, it is important to use a high-quality "after run"
oil or fuel in the engine.

The methanol used in the fuel draws moisture that can cause
corrosion inside the engine. We highly recommend Blue Thunder

TM

Final Run (DYN2255) as it is formulated specifically for protecting
your engine when it is not in use.

Follow these steps after each day’s use of the engine.

• Empty all excess fuel from the fuel tank

• Use Final Run Fuel following the Final Run instructions

• Clean and inspect the outside of the engine

Changing the Rod

With the rod having most of the stress of any other part of a
2-cycle engine, it is important to replace the rod after every
2 gallons of fuel that has been run through the engine. This is a
safe time frame for replacing the rod as it is less expensive to
install a new rod than taking the chance of having it break and
damage the engine. To replace the rod, refer to the line drawing
on the back of the manual. Study the drawing carefully and pay
close attention when removing the piston , sleeve, and rod. They
must be installed exactly in their original position in order to avoid
damaging your engine. If you have any questions about this proce­dure, please see your local hobby retailer or contact the Horizon
Service Center.

High-Speed
Needle
Valve

Higher
Idle

Idle
Adjustment
Screw

Leaner

Low-Speed
Needle
Valve

Richer

15

High-Speed
Needle
Valve

Higher
Idle

Ldle
Adjustment
Screw

Leaner

Low-Speed
Needle
Valve

Richer

Section 6: Troubleshooting Guide

PROBLEM POSSIBLE SOLUTION

Engine won’t start Reset needles to the factory setting

Improper needle setting
Out of fuel
Improper fuel
Improper glow plug
Glow starter not charged
Dead glow plug
Engine flooded

Engine starts, Pressure line blocked or unhooked
then dies Reset needles to baseline setting

Improper needle settings

Engine runs Bad glow plug
for partial tank, Idle speed set too low
then dies Improper needle settings

Overheated engine
Glow plug failed due to lean engine

setting

Section 7: Replacing the Pull Starter

If you need to replace the pull starter of your .15S, remove the
three screws from the pull starter case. Be very careful when

taking the pull starter case off of the engine and make sure the
recoil spring does not dislodge from the unit. The recoil spring is

very difficult to wind back onto the rope pulley and install back
into the pull starter case. In most cases, it is easier to have a
replacement Recoil Spring in your pit box (DYN6542) or Pull
Starter unit (DYN6535), which includes the recoil spring, rope/pul­ley, and pull starter housing. For other replacement parts for the
pull starter and disassembling guidance, refer to the line drawing in
the manual. When reassembling the pull starter, be absolutely sure
that each part is oriented in the correct manner.

Section 8: Warranty

Dynamite’s engines are guaranteed against workmanship and
manufacturing defects for period of 2 years from the original date
of purchase. This engine is of excellent design and materials and
will provide many hours of modeling enjoyment If properly cared
for, this engine is extremely durable. However, if normal common
sense care is not given to your engine, it will not function properly
for as long as intended. The following items can shorten its life and
will not be covered under warranty:

• Damage due to insufficient maintenance

• Damage related to over-revving the engine

• Rusted bearings

• Crash related damage

• Damage due to use of improper fuel and/or glow plug

• Damage due to lean runs

• Damage caused by foreign objects such as dirt or broken glow
plug elements

• Damage caused by unreasonable mounting or running conditions

• Damage due to improper disassembly or re-assembly

• Modification of any kind

• Normal engine wear

If your engine is in need of repair, please follow these steps:

1. Ship your engine in its original box (packaged in a sturdy box)
freight prepaid to:

HHoorriizzoonn SSeerrvviiccee CCeenntteerr
AATTTTNN:: DDyynnaammiittee SSeerrvviiccee
44110055 FFiieellddssttoonnee RRdd..
CChhaammppaaiiggnn,, IILL 6611882222
((221177)) 335555--99551111

2. Include a note containing a brief summary of the difficulty you

are experiencing and include the following information:

• Nitro content and brand of fuel

• Type of glow plug used

• Type of air filter used

• Approximately how much running time the engine had before
experiencing difficulty

Please date your correspondence and be sure your name and
address appear on this enclosure. Also include a daytime phone
number.

3. Warranty Repair: To receive warranty service, you must include
your original dated sales receipt to verify proof-of-purchase
date. Providing warranty conditions have been met, your engine
will be repaired free of charge.

4. Non-Warranty Repairs: Should your repair cost exceed $50.00,
you will be provided with an estimate advising you of your
options. Any return freight for non-warranty repairs will be billed
to you.

5. Payment Method: Please advise the Horizon Service Center of
the payment method you prefer to use. Please specify Visa or
MasterCard, or you may mail in a money order with the correct
total when repairs are completed. If you prefer to use your cred­it card, please include your card number and expiration date.

DYN6523 (4)

DYN6522

DYN6576

DYN6572

DYN6520

DYN6550

DYN6565

DYN6574

DYN6529

DYN6530

DYN6531
DYN6561

DYN6532

DYN6524

DYN6565

DYN6541

DYN6540

DYN6535

DYN6542

DYN6543

DYN6539

DYN6538

DYN6540

DYN6536

DYN6565

DYN6537

DYN6535

DYN6502 .15S Water-Cooled, Universal 139.95
DYN6520 Connecting Rod: 12S, 12SPD, 15S 19.95
DYN6522 Head Shims, .01, .02: 12SPD, 15S 3.95
DYN6523

Screw Set: 12S, 12SPD, w/o PS (8)

, 15S 3.95
DYN6524 PS Uni-Crankshaft: 12S, SPD, 15S 19.95
DYN6529 Flywheel Hub: 12S, 12SPD, 15S 1.95
DYN6530 Crankshaft Nut: 12S, 12SPD, 15S 1.95
DYN6531 Front Sealed Bearing: 12S, 12SPD, 15S 6.95
DYN6532 Rear Bearing: 12S, 12SPD, 15S 8.95
DYN6535 Pull Starter: 12S, 12SPD, 15S 19.95
DYN6536 PS Backplate: 12S, 12SPD, 15S 6.95
DYN6537 PS One-Way Bearing, 15S 12.95
DYN6538 PS Shaft: 12S, 12SPD, 15S 2.95
DYN6539 PS Cushion Spring: 12S, 12SPD, 15S 1.95
DYN6540 PS Screw Set: 12S, 12SPD, 15S 2.95
DYN6541PS Handle w/Cotter & Extension: 12S, 12SPD, 15S 3.9 5
DYN6542 PS Recoil Spring: 12S, 12SPD, 15S 4.95
DYN6543 PS Rope/Pully: 12S, 12SPD, 15S 2.95
DYN6550 Carburetor: 12S, 12SPD, 15S 24.95
DYN6551Carburetor Body w/Spray Bar: 12S, 12SPD, 15S 12 .95
DYN6552 Throttle Barrel: 12S, 12SPD, 15S 5.95
DYN6553 Throttle Barrel Boot: 12S, 12SPD, 15S 2.95
DYN6554 Throttle Arm w/Nut: 12S, 12SPD, 15S 2.95
DYN6555 High Speed Needle Valve: 12S, 12SPD, 15S 4.95
DYN6556 High Speed Needle Holder: 12S, 12SPD, 15S 4.9 5
DYN6557 High Speed Assembly Washers: 12S, 12SPD, 15S 2.95
DYN6558 Fuel Inlet Nipple: 12S, 12SPD, 15S 2.95
DYN6559 Low Speed Needle Valve: 12S, 12SPD, 15S 4.95
DYN6560 Idle Screw w/Spring: 12S, 12SPD, 15S 2.95
DYN6561 Carburetor Cinch Bolt: 12S, 12SPD, 15S 3.95
DYN6562 Throttle Barrel Spring: 12S, 12SPD, 15S 1.95
DYN6565 O-Ring Set, Complete: 12S, 12SPD, 15S 2.95
DYN6571 Water-Cooled Head: 15S 15.95
DYN6572 Piston Pin w/2 Clips: 15S 2.95
DYN6573 Combustion Chamber: 15S 5.95
DYN6574 Crankcase: 15S 18.95
DYN6575 O Ring Set: Water-Cooled Head 3.95
DYN6576 Piston/Cylinder Set: 15S 34.95

DYN6555
DYN6565

DYN6556

DYN6557

DYN6558

DYN6560

DYN6551

DYN6565

DYN6562

DYN6552

DYN6553

DYN6565

DYN6559

DYN6554

Parts Listing:

DYN6571

DYN6575

DYN6573