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Global Services  18480 Bandilier Circle  Fountain Valley, CA  92708  Phone: (714) 963-0329  Fax: (714) 964-6236  Email:  [email protected]

The diameter and pitch of the propeller needed for your XL RFS series
engine will vary greatly depending on the application the engine is used in.
The weight, drag and the type of model and how you intend to fly it are all
factors in determining the correct size propeller to use.  Experimentation
will be necessary to find the optimal size propeller for your particular
application.  Ideally you want a propeller that will allow the engine to turn in
the 8,000 - 10,000 rpm range on the ground, yet power the airplane
sufficiently.  Using a propeller that is too small will cause the engine to run at
too high an rpm.  Using a propeller that is too large will cause the engine to
run at too low an rpm and cause it to lug down too much.  In both instances
this can lead to premature engine wear and eventual failure.

PROPELLER SIZE RECOMMENDATIONS FOR XL 1.80RFS

Propeller Recommendation

Use for

Break-In

16 x 8

16 x 6

16 x 10

18 x 4-5

PROPELLER, GLOW PLUG & FUEL

Glow Plug Recommendation

We recommend using a hot heat-range glow plug intended specifically for
four-stroke engines.  Do not use a cold heat-range plug or a plug designed
for two-stroke engines.  This can lead to erratic engine runs and eventual
engine wear and failure.  

Thunderbolt 4-Stroke, O.S. Type-F and Fox

Miracle Plugs are good choices.

Fuel Recommendation

Fuel can make a big difference in the way your engine performs.  We
recommend using two types of fuel with your XL RFS series engine.  For the
break-in period you should use a fuel containing no more than 10% nitro
methane and no less than 18% Castor/synthetic blend lubricant.  Use of fuel
containing more than the recommended percentage of nitro methane or only
synthetic lubricants will cause the engine to run too hot and result in excessive
wear and engine failure in a very short period of time.  Once the engine has been
adequately broken in (about 1/2 gallon of the recommended break-in fuel),
a fuel containing 5% - 30% nitro methane and 16% -22% Castor or synthetic
blend lubricant fuel can be used.

WARNING

  

For the break-in period, we do not recommend using fuel

that contains only synthetic lubricants.  Synthetic lubricants have a much
lower flash point than Castor Oil lubricants.  Flash point is the point at
which the lubricant begins to actually burn and lose its lubricating qualities.
Using fuel containing a blend of Castor Oil and synthetic lubricants results
in an engine that runs cooler and lasts longer.  One lean run using a fuel
containing only synthetic lubricants can cause engine failure.  Using fuels
with a Castor Oil and synthetic blend of lubricants greatly reduces this chance.

High Speed Needle Valve

The high speed needle valve is used to meter the air/fuel mixture at full
throttle.  Turn the needle valve clockwise to lean the mixture or turn the needle
valve counterclockwise to richen the mixture.  When you start the engine for
the very first time the needle valve should be turned in completely, then backed
out 2-1/2 turns.  When you start the engine after that, leave the needle valve
in the same position it was in when you shut down the engine.

HIGH & LOW SPEED NEEDLE VALVES

Low Speed Needle Valve

The low speed needle valve is preset from the factory for initial starting and
break-in.  Do not adjust it until after the engine is broken in.  The low speed
needle valve regulates the air/fuel mixture at idle and during transition from
idle to full throttle.  Turn the needle valve screw clockwise to lean the
mixture.  Turn it counterclockwise to richen the mixture.  The low speed
needle valve screw is preset from the factory, but minor adjustments may
need to be made after the engine is broken in.  

To reset the low speed

needle valve screw to the factory setting, follow these procedures:

Open the carburetor barrel completely.

While holding the barrel open, turn the needle valve screw IN

(clockwise) GENTLY until it stops.  From this point, while still holding
the barrel open, turn the needle valve screw OUT (counter-clockwise)
2 full turns.  This is the factory setting.

WARNING

  It is possible to turn the low speed needle valve screw so

lean that the engine will not draw fuel.  The low speed needle valve screw
should not need to be adjusted more than one full turn in either direction
from the factory setting.  If the engine does not idle or transition, reset the
low speed needle valve screw to the factory setting.

Your XL RFS series engine can be started using an electric starter or it can
be started by hand.  For safety and ease of starting, especially when the
engine is new, we recommend using an electric starter.  The following two
procedures should be done with the power to the glow plug off.

Starting Using an Electric Starter

When using an electric starter it is not necessary to choke and prime the
engine.  The starter turns the engine over fast enough that the engine draws
fuel on its own.  Priming the engine prior to using an electric starter can
cause the engine to "hydro-lock" or flood.  This is a result of too much fuel in
the engine before it actually fires.  

Turning the engine over with an

electric starter while the engine is flooded can cause extreme damage
to the engine and/or cause the propeller  assembly to come loose.  Turn
the propeller through the compression stroke one time by hand to check
for a hydro-locked state before applying the starter.

STARTING PROCEDURE

Starting by Hand

When starting the engine by hand always use a chicken stick or a heavy
leather glove.  Never just use your bare hand or serious injury could result.
To make the engine easier to start by hand it should first be primed.  This is
done by opening the carburetor barrel completely and covering the tip of the
exhaust pipe with your finger.  Fuel can then be drawn into the engine by
"pulling" the propeller through the compression stroke 2 - 3 times.  This will
draw fuel into the engine.  After fuel begins to enter the carburetor, remove
your finger from the exhaust pipe and pull the propeller through the
compression stroke once to check for a hydro-locked condition.

WARNING ABOUT ENGINE HYDRO-LOCKING

If the engine becomes hydro-locked, do not force the propeller through
the compression stroke.  The excess fuel should be expelled from the
engine before attempting to start it.

Completely close the high speed needle valve until it bottoms out, then

remove the glow plug from the cylinder head.

With a rag over the top of the engine, turn the crankshaft several times,

using your electric starter or flipping the propeller by hand.  The excess
fuel will be expelled out of the engine and into the rag.

Check to make sure that the glow plug has not been fouled, then reinstall it.

Reset the high speed needle valve.

18 x 6

Содержание XL 1.80RFS

Страница 1: ...an also pinch the fuel line to stop the engine but only if it is accessible Do not throw anything into the spinning propeller or attempt to use your hands to stop the engine While the engine is running stand behind the engine to make any adjustments to the needle valves Do not reach over or around the propeller Do not lean toward the engine Do not wear loose clothing or allow anything to be drawn ...

Страница 2: ...an remove the carburetor and reinstall it in the opposite direction with no effect on performance To remove the carburetor loosen the two screws holding the intake manifold in place Next remove the two screwsholdingthecarburetor to the engine and remove it by gently pulling it down off the intake pipe Installation is the reverse of disassembly Be careful not to damage the O ring when reinstalling ...

Страница 3: ...le valve is preset from the factory for initial starting and break in Do not adjust it until after the engine is broken in The low speed needle valve regulates the air fuel mixture at idle and during transition from idle to full throttle Turn the needle valve screw clockwise to lean the mixture Turn it counterclockwise to richen the mixture The low speed needle valve screw is preset from the facto...

Страница 4: ...g on the high speed needle valve and you can begin to fine tune the needle valve settings to increase performance BREAK IN PROCEDURE Now that your engine is broken in you can set the high and low speed needle valves for optimum performance Please jump to the top of the next column OPTIMIZING THE MIXTURE SETTINGS WARNING Be careful never to lean the engine out too much Remember that the lubricants ...

Страница 5: ...Tappet Screw 284300 Crankcase 284301 Backplate 284302 Connecting Rod 284303 Crankshaft 284304 Wrist Pin Retainer 284305 Propeller Washer 284306 Piston 284307 Cylinder Sleeve 284308 Piston Ring 284309 Propeller Nut Safety Nut 284310 Muffler Assembly 284311 Muffler Only w Nipple 284312 Rocker Cover 284313 Rocker Arm 284314 Cam Gear 284315 Carburetor Assembly 284316 Throttle Barrel 284317 Intake Pipe...

Страница 6: ...re tight including the muffler and exhaust pipe cinch nuts Periodically check your fuel system including the plumbing inside the fuel tank for leaks or cracks We recommend changing the silicone fuel tubing inside and outside the fuel tank at the start of every flying season or about once a year Long Term Storage If you will not be using your engine for a long period of time such as during the wint...

Страница 7: ...el Be sure to tighten the cinch nuts securely to prevent the muffler and exhaust pipe from loosening 3 Install the propeller to the engine using the propeller washer propeller nut and the safety nut provided Tighten the nuts securely using an adjustable wrench 4 Connect the fuel lines to the carburetor and to the muffler Make sure that the silicone crankcase return tube is connected between the cr...

Страница 8: ... close completely completely 6 Engine overheats A Engine running too lean A Richen high speed needle valve B Cowl too restrictive B Open larger vents in cowling to allow air to exit C Wrong type of fuel used C Use fuel with recommended oil content D Engine not fully broken in D Allow engine further break in time 7 Engine stops abruptly A Engine running too lean A Richen high speed needle valve B P...

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