Magnum XL .52RFS Operating Instructions Manual Download

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Engine Starting

1) Carefully turn the high speed needle valve in completely until it stops,

then turn the needle valve out 2-1/2 turns. This is the mixture setting for
initial starting.

IMPORTANT

Do not adjust the low speed needle valve at this time.

It’s factory-adjusted for the break-in process.

2) If hand starting, prime the engine by opening the throttle barrel

completely, placing your finger over the muffler opening and flipping the
propeller through compression 2~3 times. If you will be using an electric

starter,

do not

prime the engine. The starter will turn the engine over fast

enough to draw fuel on its own.

3) Connect the glow starter to the glow plug. Open the throttle barrel

to about 1/4 throttle and start the engine. If you are starting the engine by

hand, you will need to vigorously flip the propeller several times before

the engine will start. Once the engine begins running, immediately turn
the high speed needle valve in about 1/4 turn to keep the engine running.

4) Advance the throttle to full while turning the high speed needle

valve in to keep the engine running. The engine should be producing a

very noticeable white exhaust from the muffler and sound like it is running
rough. Allow the engine to run only for about 5 minutes, then shut the

engine off.

5) Now that you have started your engine, it must be properly broken

in. Proper break-in will seat all of the moving parts, particularly the piston
ring and cylinder. This procedure takes about 45 minutes of run-time and

is highly recommended. An engine that is properly broken in will produce

more power, be more user-friendly and last much longer than an engine
that does not receive a break-in period. For this reason we highly
recommend following the break-in procedure detailed in the Operating
Instructions before running the engine further.

OUR RECOMMENDATIONS

The following items are recommended for use with your Magnum XL RFS
series aircraft engine. These items are recommended for initial start-up and
running. Please read through the Operating Instructions for further details.

Fuel:

Power Master 15% Premium Sport Fuel Blend for Break-In and

for Normal Use

We suggest using Power Master brand fuels. Power Master fuel comes in
many different nitromethane contents that can be used in your XL RFS

series engine. Power Master fuels are blended using only high-quality

nitromethane, methanol, castor oil and synthetic lubricants to provide
high power output, along with easy starting and unmatched lubricating

and heat dissipation qualities.

Fuel Tank:

Dubro 10oz. Fuel Tank (Product Number 410)

Dubro fuel tanks are a perfect match for your XL RFS series engine. This
size recommendation will give you about 15 minutes of run-time at full
throttle. Dubro fuel tanks are possibly the easiest fuel tanks to assemble
and maintain, and feature a chin at the base of the fuel tank that prevents
the fuel tubing from kinking when installed in your aircraft.

Glow Plug:

Thunderbolt HP Glow Plug (Product Number 115480)

The Thunderbolt HP glow plug is designed specifically for four-stroke

engines and produces low idle speeds, smooth transition, and cooler
running temperatures. The glow plug is also very durable and able to
withstand repeated use, day after day.

Propeller:

APC 12 x 6 Propeller (Product Number LP12060)

We have found that XL RFS series engines run best using APC brand
props. They are designed to be very efficient and run quiet at high rpm’s,

and they are also durable. Use this size propeller to break in your engine,
then change to the propeller that best suits your application. Use the

guide in the Operating Instructions to help you find the right size propeller.

Glow Starter:

Magnum Glow Starter w/Meter (Product Number 237438)

The Magnum glow starter is an excellent choice for heating the glow plug.

It uses a Sub-C NiCD, includes a meter to determine the quality of your

glow plug, and it also includes a charger to recharge the battery. It’s a
very economical product to purchase and can be used with any engine
that uses a glow plug.

Engine Mount:

Dave Brown Engine Mount (Product Number 4045L)

The Dave Brown engine mount is a glass-filled reinforced nylon mount
that mounts to a plywood firewall in the model. It is lightweight, strong

and easy to install. The 'L' type mount features longer mounting beams
to allow for the rear-mounted carburetor found on four-stroke engines.

XL .52RFS AIRCRAFT ENGINE QUICK-START GUIDE

The following information is provided to get your new Magnum XL RFS series engine running right away with minimal effort. We have listed our

recommendations for fuel, propeller, glow plug, starting procedures and other recommended accessories. Also included is general information
about the accessories needed for the engine that we hope you will find helpful.

This Quick-Start Guide should not be used as a replacement for the Operating Instructions included, rather, it should be used along with the
Operating Instructions. We highly recommend reading through the
Operating Instructions to familiarize yourself with each part of the engine,
along with the proper procedures for engine break-in and tuning.

Engine Preparation

1) Mount the engine to the recommended engine mount. A wood beam

mount built into the airframe would also be sufficient.

2) Install the muffler and exhaust pipe onto the engine using the

cinch nuts provided. The exhaust pipe can be rotated to better suit

the installation in your model. Be sure to tighten the cinch nuts firmly to
prevent the muffler and exhaust pipe from loosening.

3) Install a glow plug into the cylinder head, making sure to use the

copper gasket provided with the glow plug.

4) Install the propeller using the propeller nut, safety nut, and washer

provided. Tighten the nuts securely using an adjustable wrench.

5) Connect the fuel lines from the fuel tank to the engine. The fuel

pick-up line should be connected to the fuel nipple on the carburetor
and the pressure line should be connected to the pressure nipple on the