FX G501 User manual
Your FX Engine is a high-precision, high-performance model engine intended for
use in model cars. All of the nest engineering and craftsmanship has gone into
the concept, design, creation, and nishing of your very own FX Engine.
This engine and all of its parts were designed and manufactured by FX in-house
in Slovakia, Europe from all the nest European materials and using the most
advanced Swiss and German technologies. Even the crankcase was die cast in
house using our own fully robotic die casting technology. All the products are
individually measured and inspected and all of the important dimensions of every
part are recorded so there is a full record of every single part being manufactured
and assembled. Your engine birth certicate shows all the important serial numbers
and measurements so that, at anytime, all details of the production including the
batch of material, machine programs, responsible craft persons and production
dates can be traced back to its roots.
Enjoy your royal FX Engine.
It is extremely important - before attempting to operate your new FX engine
– to read this Instruction Manual, and strictly adhere to the advice contained
therein.
This engine is not a toy but a highly efcient internal-combustion engine with
power which is capable of harming you or others.
This engine is intended for persons aged 16 years and older with previous
experience building and operating RC model racing cars and with previous
experience operating combustion nitro engines.
This product is not intended for use by beginners, inexperienced customers, or
by children without direct supervision of a responsible, knowledgeable adult.
Before installing and operating your engine, YOU MUST read through all of the
operating instructions and Instruction Manual and fully understand them to get
the maximum enjoyment and prevent unnecessary damage.
Keep this Instruction Manual in a safe, easily-accessible location so you can
quickly & easily refer to it whenever necessary.
Content of the box may differ from pictures shown in any promotional materials
such as catalogs, leaets, internet web site, instruction manual, etc.
Use only genuine and original authentic FX parts for maximum performance.
Using any third-party parts on this engine may negatively inuence the
performance and reliability of the engine and moreover using any third-party
parts on this engine will void the warranty.
Use only genuine FX glow plugs to ensure highest performance and long life time.
In line with our policy of continuous product development, the exact
specications of the product may vary without prior notice.
FX reserves all rights to change any specication without prior notice. All rights
reserved.
2. Before You Start
3. Limitations of Liability
3. Safety Precautions
4. Warnings
6. Very Important Warnings
7. Warranty
8. Included
8. Equipment Required
10. Basic Information
13. Engine Parts
23. Installation
29. Break-in Procedure
30. Break-in Procedure with Break-in Bench
36. Break-in Procedure in the Car
38. Maintenance
42. Replacing Parts
43. Bearing Change
46. Troubleshooting
When using and/or operating this engine always wear protective glasses,
gloves, ear protection and protective shield.
Take appropriate safety precautions prior to operating this product. You are
responsible for this engine installation and safe operation!
Please read the Instruction Manual before building and operating this model and
follow all safety precautions.
Improper operation may cause personal and/or property damage.
FX has no control over damage resulting from shipping, improper installation, or
improper usage.
FX assumes and accepts no responsibility for personal and/or property
damages resulting from the use of improper building materials, equipment and
operations.
By purchasing any item produced by FX, the buyer expressly warrants that
he/she is in compliance with all applicable federal, state and local laws and
regulation regarding the purchase, ownership and use of the product.
The buyer expressly agrees to indemnify and hold harmless FX for all claims
resulting directly or indirectly from the purchase, ownership or use of the
product.
By the act of assembling or operating this product, the user accepts all resulting
liability. If the buyer is not prepared to accept this liability, then he/she should
return this product in new, uninstalled, and unused condition to the place of
purchase.
FX makes no other warranties expressed or implied.
FX shall not be liable for any loss, injury or damages, whether direct, indirect,
special, incidental, or consequential, arising from the use, misuse, or abuse of
this product and/or any product or accessory required to operate this product.
In no case shall FX‘s liability exceed the monetary value of this product.
Be sure that your operating frequency is clear before turning on or running your
model, and never share the same frequency with somebody else at the same
time. Ensure that others are aware of the operating frequency you are using and
when you are using it.
Use a transmitter designed for ground use with RC cars. Make sure that no one
else is using the same frequency as yours in your operating area. Using the
same frequency at the same time, whether it is driving, ying or sailing, can
cause loss of control of the RC model, resulting in a serious accident.
Always turn on your transmitter before you turn on the receiver in the car. Always
turn off the receiver before turning your transmitter off.
Keep the wheels of the model off the ground when checking the operation of the
radio equipment and working on your engine.
Disconnect the battery pack before storing your model.
Exercise care when using tools and sharp instruments.
Take care when building and operating, as some parts may have sharp edges.
When learning to operate your model and working on your engine, go to an
area that has no obstacles that can damage your model if your model suffers a
collision.
If the model behaves strangely, immediately stop the model, check and resolve
the problem.
Remove any sand, mud, dirt, grass or water before putting your model away.
This product is not suitable for children under 16 years of age without the direct
supervision of a responsible and knowledgeable adult.
This model engine is designed exclusively for installation into model cars.
Never use it for any other purpose as it may cause personal injury or mechanical
failure.
Mount the engine in your model securely, following the manufacturer‘s
recommendations, using appropriate fasteners.
Assembly and operate this product only in places away from the reach of
children.
When you operate an engine, keep children and others away from you and the
engine. Anyone who is not operating the engine should remain at least 6 meters
away from the engine.
Keep small parts out of reach of small children. Children must not be allowed to
put any parts in their mouth, or pull vinyl bag over their head.
Immediately after using your model, do NOT touch equipment on the model such
as the engine, mufer or manifold because they generate high temperatures.
You may seriously burn yourself by touching them.
Do not put ngers or any objects inside or near rotating and moving parts, as
this may cause damage or serious injury as your nger, hair, clothes, etc. may
get caught.
Follow the operating instructions for the radio equipment at all times.
To prevent any serious personal injury and/or damage to property, be responsible
when operating all remote controlled models.
The model car is not intended for use on public places and roads or areas where
its operation can conict with or disrupt pedestrian or vehicular trafc.
Because the model car is controlled by radio, it is subject to radio interference
from many sources that are beyond your control. Since radio interference can
cause momentary loss of control, always allow a safety margin in all directions
around the model in order to prevent collisions.
Never operate the engine-equipped model alone. Remember that operating any
model with engine requires skills and continuous safety precautions. When you
operate a model, you should ask for the assistance of an experienced person
who can accompany you, recognize emergency situations nearby, and has
enough experience avoiding possible dangers.
Always test the brakes and the throttle before starting your engine to avoid
losing control of the model.
Check the throttle linkage connections before starting and running the model
car. If any connections fail, it may cause personal injury.
Before starting the engine, always check the tightness of all fasteners especially
those on joints and moving parts such as the throttle arm. Failure to re-tighten
loose fasteners often causes part breakages that are capable of harming you.
Keep your face, hands, and body away from the spinning ywheel, gears and
other objects on the model or engine to prevent injury. If the tires, ywheel or
gears break, ying pieces may result in personal injury.
In order to avoid ear damage, use an effective silencer (mufer) for sound
reduction. Always wear ear protection.
Keep loose objects such as shirt sleeves, neckties, and scarves away from the
spinning tires, ywheel, and gears.
Be careful not to drop any objects such as screwdrivers, pencils, utensils, etc
into the spinning tires, ywheel, and gears. If these objects contact moving
engine or transmission parts, it may cause mechanical breakage and personal
injury.
Near real cars, animals, or people that are unaware that an RC car is being
driven.
In places where children and people gather.
In residential districts and parks.
In limited indoor spaces.
In wet conditions.
In the street.
In areas where loud noises can disturb others, such as hospitals and
residential areas.
At night or anytime your line of sight to the model may be obstructed or
impaired in any way.
Do not use your model:
Store fuel in a cool, dry, dark, well-ventilated place, away from heating devices,
open ames, direct sunlight, or batteries. Keep nitro fuel away from children.
Do not leave the fuel in the carburetor or fuel tank when the model is not in use.
There is danger that the fuel may leak out.
Wipe up any spilled fuel with a cloth.
Be aware of spilled or leaking fuel. Fuel leaks can cause res or explosions.
Do not dispose of fuel or empty fuel containers in a re. There is danger of
explosion.
If someone’s skin or face has been splashed with fuel, rst wash it away with
soap and water, then immediately consult a physician. If you swallow fuel, it
is imperative to seek immediate medical treatment. Failure to undergo such
treatment may endanger your life.
Never run your engine without an air lter. Your engine can be seriously
damaged if dirt and debris get inside the engine.
Immediately after the engine has been run there exist conditions when the
engine may restart if it is rotated over compression without the glow plug battery
being reconnected.
When checking the electric conduction to the glow plug, use a tool or clamp
to handle. Never touch the wire plug or cable directly by hand. In this situation
keep your face away from heated portion. Seething fuel may spout out and
cause a skin burn.
Make sure the air lter is clean and oiled.
Excessively rich running and prolonged low speed running should be avoided.
Prolonged low speed running and low temperature running may result in the oil
in the fuel becoming gelled and the piston/liner becoming stuck together.
Handle fuel only outdoors. Never handle nitro fuel indoors, or mix nitro fuel in a
place where ventilation is not appropriate.
Only use nitro fuel for RC models. Do not use gasoline or kerosene in RC models
as it may cause a re or explosion, and ruin your engine.
Nitro fuel is highly inammable, explosive, and poisonous. Never use fuel
indoors or in places with open res and sources of heat.
Always keep the fuel container cap tightly shut.
Always read the warning label on the fuel container for safety information.
Nitro-powered model engines emit poisonous vapors and gasses. These vapors
irritate eyes and can be highly dangerous to your health. We recommend
wearing rubber or vinyl gloves to avoid direct contact with nitro fuel.
Do not operate near open ames or smoke while running your model or while
handling fuel.
Nitro fuel for RC model cars is made of the combination of the methyl alcohol,
castor or synthetic oil, nitro methane, etc. The ammability and volatility of
these elements is very high, so be very careful during handling and storage of
nitro fuel.
Pour all the remaining fuel out of the fuel tank after every use. Never pour
fuel back into the original fuel bottle after use; once the fuel is out of the
original container and exposed to air, the quality of the fuel is affected and it
deteriorates.
Some parts will be hot after operation. Do not touch the exhaust or the engine
until they have cooled. These parts may reach 135°C (275°F) during operation!
Keep nitro fuel away from open ame, sources of heat, direct sunlight, high
temperatures, or batteries.
FX guarantees that all parts of a newly-purchased engine are manufactured with
the highest regard to quality. However, due to the many factors inherent in model
racecar competition, FX cannot guarantee any parts once you start the engine.
FX guarantees this product to be free from defects in both material and
workmanship within 30 days of purchase.
The total monetary value under warranty will in no case exceed the cost of the
original product purchased.
FX has no control over usage of this product once it leaves the shop, therefore
FX can only offer warranty against all manufacturer‘s defects in materials,
workmanship, and assembly at point of sale and before use.
Any and all warranty coverage will not cover replacement of any part or component
damaged by neglect, abuse, or improper or unreasonable use or as a result of
wear. This includes but is not limited to damage from crashing, chemical and/
or water damage, excessive moisture, improper or inadequate maintenance, or
user modications which compromise the integrity of components or using
non-original parts and equipment such as glow plugs, mufers, etc.
Any parts missing from this product must be reported within 30 days of
purchase.
No part or parts will be sent under warranty without proof of purchase.
Should you nd a defective or missing part, contact the local distributor.
Service and customer support will be provided through the local hobby store
where you have purchased the product, therefore make sure to purchase any FX
products at your local hobby store.
This product is considered to be a high-performance racing engine. As such this
product will be used in an extreme range of conditions and situations, all which
may cause premature wear or failure of any component at any time.
No warranties are expressed or implied that cover damage caused by what is
considered normal use, or cover or imply how long any components or parts
will last before requiring replacement.
Due to the high performance level of this product you will need to periodically
maintain and replace consumable components.
Do not modify the engine or any parts of it in any way. Any modications will
void the warranty immediately.
FX does not pay nor refund shipping on any component sent to FX or its
distributors for warranty.
FX reserves the right to make the nal determination of the warranty status of any
component or part.
Some small scratches may be visible on some of the components and is not
considered a manufacturing defect.
Special silicone fuel tube is required to connect the fuel
tank to the engine.
#154065 HUDY Slotted Screwdriver for Engine #4.0mm - Long
#111545 HUDY Allen Wrench #1.5mm
#112045 HUDY Allen Wrench #2.0mm
#112545 HUDY Allen Wrench #2.5mm
#107612 HUDY Exhaust Spring / Caster Clip Remover
To start the engine use professional starter box with a high
torque motor.
#104400 HUDY Star-Box On-Road 1/10 & 1/8
#104500 HUDY Star-Box Off-Road 1/8
A glow plug starter is required to ignite the glow plug for
starting. Use a high-quality battery-operated glow plug
starter.
A glow plug wrench is required for removing/installing the
engine glow plug.
#107581 HUDY Glowplug Wrench # 8mm / Clutchnut #
10mm Long
A temperature gauge is useful to check the engine
temperature during the break-in period as well during
every run on the track to verify your engine works within the
standard heat limits.
Please refer to the exploded view sheet to see what all parts are included with your
engine. Typically an FX engine includes:
(1 piece)
(1 piece)
(1 piece)
(1 piece)
(1 piece each)
We recommend using after run oil to extend the lifetime of
your engine.
#106250 HUDY Engine After Run Oil
A two-stage foam air lter must be used at all times.
To install the engine in the car you need rst to install the
complete clutch system on the engine. The clutch system &
ywheel collar should be included with your car kit.
High quality air lter oil is required to prevent debris to get
into the engine.
#106240 HUDY Air Filter Oil
To break-in the engine we recommend using an RC car
engine break-in bench.
#104140 HUDY Engine Break-In Bench
Recommended for servicing and replacing the ball-bearings
in the engine.
#107050 HUDY Ultimate Engine Tool Kit for .12 Engines
#107051 HUDY Ultimate Engine Tool Kit for .21 Engines
Use pliers to install ball linkages and to check glow plug.
#189020 HUDY Micro Pliers - Combination
#189030 HUDY Micro Pliers - Long Nose
It is suggested to use high-quality RC car fuel with 16~30%
nitro methane.
A fuel lter is recommended to prevent debris from getting
into the engine.
For lling the fuel tank, a fuel bottle with a suitable spout
is required.
#104200 HUDY Fuel Bottle with Aluminum Neck
A motor spray is required for cleaning the engine after each
run.
Special ywheel tool will be required to install the clutch
system on your engine.
#182010 HUDY Flywheel / Clutch Multi-Too
#182015 HUDY Flywheel / Wheel Nut Multi-Tool 1/8 Off-Road
To get maximum performance and life time from your engine you need to work
and approach the engine with very specic and detailed care and attention. Every
small detail matters and has a signicant inuence on the performance, reliability
and life time.
To make the engine leaner Means to tighten (close) the main (high-speed)
needle CW (to the right).
To make the engine richer Means to loosen (open) the main (high-speed)
needle CCW (to the left).
The engine temperature should not fall below at any point while
it is being operated.
In cases where your engine reaches temperatures higher than ,
immediately stop the engine as you risk serious damage to the engine.
To adjust a needle or screw on the carburetor we refer to a fraction of a turn, for
example 1/12, 1/4, 1/2, etc. Sometimes the fraction of the turns are also called
“hours“, for example 1/12 of a turn equals to 1 hour.
During all the operations with your engine you need to regularly check for the
temperature of the engine. To measure the temperature use a high-quality
temperature infrared gauge and measure the temperature inside the engine head in
the area of glow plug and from the side of the engine head.
The working temperature of the engine should be in between range 100~130°C
(212~266°F). The working temperature range always depends on the weather
temperature, humidity, altitude and the track conditions.
The optimum working temperature should be 100~125°C (212~257°F) when the
air temperature is in the range of 5~30°C (41~86°F).
The lower air temperature, the lower temperature of the engine will be.
The higher air temperature, the higher temperature of the engine will be.
The leaner the engine setting, the higher working temperature will be.
The more rich the engine setting, the lower working temperature will be.
1/12 = 1/12 = 1 hour
2/12 = 1/6 = 2 hours
3/12 = 1/4 = 3 hours
4/12 = 1/3 = 4 hours
5/12 = 5/12 = 5 hours
6/12 = 1/2 = 6 hours
7/12 = 7/12 = 7 hours
8/12 = 2/3 = 8 hours
9/12 = 3/4 = 9 hours
10/12 = 5/6 = 10 hours
11/12 = 11/12 = 11 hours
12/12 = 1 = 12 hours
The performance will change during the life time of the engine. This high-
performance engine is designed for high-level racing and as such its life time
is limited. The life time of the engine is very individual and depends on various
factors and conditions. The typical life time of the engine is in the range of 0 up
to 20-30 hours.
The life of the engine very radically decreases when you run in:
Extremely dusty conditions without a new lter for every run
In rain (water and mud)
In many cases after a race in such extreme conditions the engine may be damaged
regardless of the amount of prior use, therefore for these extreme conditions we
suggest using an older engine if available.
Take the time and break-in the engine properly following the instructions in the
Break-in Procedure part, this will signicantly increase life time.
Always using a clean air lter will greatly increase the life expectancy of the
engine.
Always use the proper air lter oil.
After every race apply the after run oil.
Always use high-quality branded fuel.
Always use only the original FX glow plug, mufer, manifold and replacement
ball-bearings.
Always clean the engine.
Always store the engine in dry area. Humidity will destroy parts of the engine.
Avoid excessively dusty or wet conditions.
Always after every run check if the wire of the glow plug is clean and has a
smooth surface. If this is not the case, replace the glow plug immediately. A
broken glow plug may destroy your engine.
Always after every race check if the ball-bearings have free and smooth
movement. As soon you feel some ‘gritty’ movement immediately exchange
the ball-bearings for new ones.
During the 20-30 hours of the life time of the engine there is no need to
change crankshaft, piston, sleeve or any other part. The only parts that must be
regularly changed are the ball bearings, glow plug and air lter.
0-2 hours The engine will break-in and all parts will properly seat.
2+ hours
After 2 hours of rst run the performance should be very
good. The temperature of the engine should not be more than
120°C (248°F).
5-15 hours The maximum performance of the engine should usually last
between the 5th-15th hours of run time.
15~30 hours The high performance of the engine is up to 20-30 hours
depending on the various factors.
The fuel consumption depends on mix of various factors such as life time of the
engine, carburetor setting, venturi size used, working temperature, air temperature,
humidity, track conditions, altitude, fuel, air lter, mufer, manifold, weight of the
car, traction of the car, free work of drive train, driving style, etc. To nd the correct
and optimum fuel consumption setting of your engine is complex and requires
testing and experience.
Generally the more running hours your engine has, the longer run time it should
have. The run time is greatly inuenced by various factors such as:
Life of your engine
Type of the track
Traction
Venturi used
This is an average table showing the run time depending on life of your engine
under optimum circumstances:
The smaller venturi you use, for example 6.0 or 6.5mm the lower fuel consumption
will be. This means longer run times can be achieved, but it will be more difcult
to set the carburetor.
When the engine is cold, and especially when it is new before proper break-in, the
piston will feel very tight at the top of the stroke at the top of the cylinder. This is
when the piston is at a point called – Top Dead Center.
The cylinder has a slight taper to the cylinder bore; the parts are designed to
achieve a perfect running clearance when the piston and cylinder reach the proper
operating temperature.
– Top Dead Center
Cold engine
0~5 hours 6.5~8.5 min
5~10 hours 7.0~9.0 min
10~15 hours 8.0~10.0 min
15~30 hours 8.5~11.0 min
Hot engine
Weather
Mufer and manifold
Glow plug
Shims under the head
Main high-speed needle (upper)
Main high-speed needle body
Venturi
Carburetor fuel inlet nipple
Idle adjustment screw
Carburetor slide
Carburetor slide boot
Venturi O-ring
Mixture control needle (rear)
Carburetor body
Isolator
Carburetor O-ring
Low-end needle (front)
Glow plug
Engine head
Combustion chamber
Engine head shim
Sleeve
Piston clip
Exhaust seal ring
Back plate
Rear bearing
Crankshaft
Back plate O-ring
Carburetor retainer clamp
Piston
Piston pin
Carburetor retainer clamp
Front bearing
Crankase
Conrod
Carburetor ball linkage
There are four adjustable controls on the carburetor. There are 3 needles and 1
screw.
2 Low-End Needle (Front)
3 Mixture Control
Needle (Rear)
4 Idle Screw
1
The Main High-Speed Needle (Upper) controls the overall fuel ow to the
carburetor.
When the Main High-Speed Needle is properly adjusted, the engine
immediately responds to the throttle operation with clean, hard acceleration
without hesitation.
The main purpose of the Main High-Speed Needle adjustment:
Controls the overall fuel ow to the carburetor.
Controls the maximum RPM together with power of engine when carburetor
is fully open.
1 Main High-Speed Needle (Upper)
The carburetor is preset at the factory and the engine should be started with these
controls set as-is. Anytime you get lost we strongly suggest returning back to the
factory basic setting. The factory basic carburetor setting may be different for the
different types and versions of engine. For the particular basic carburetor settings
please refer to the Parts List included with your engine.
Every type of the engine may have a different basic set-up of the carburetor after
break-in. For the suggested basic set-up of your particular engine please check the
Parts List inlcuded with your engine.
2
The Low-End Needle (Front) controls the amount of fuel at idle and low-to-
middle RPM. The most difcult setting is the proper low-speed adjustment.
Follow these principles:
Use the Idle Adjustment Screw to adjust the idle RPM immediately after
closing the carburetor.
Use the Low-End Needle to adjust the fuel mixture 2-5 seconds after closing
the carburetor. It is recommended to make ne adjustments in 1/12 turn
increments.
The Low-End Needle adjusts the performance of the engine between idle up to
approximately 1/4 throttle which means middle RPM. The Low-End Needle of
each individual engine is precisely adjusted at the factory.
3
The Mixture Control Needle (Rear) is
used for changing the mixture strength
at middle speed and acceleration. (This
adjustment is typically reserved for only
experienced engine tuners.)
4
The Idle Adjustment Screw is
used for setting minimum idle
RPM.
The mufer is sometimes also called the pipe, silencer or exhaust system. For
maximum performance and reliability we recommend using only the original FX
mufer. All FX mufers are specially designed and tuned to work with FX engines.
All FX mufers are EFRA approved and as such have the EFRA number engraved.
Please refer to exploded Parts List of your engine where you will nd the suggested
part number of the mufer to use for your particular FX engine. In case this engine
was supplied as a combo with a mufer use only this mufer unless suggested
by FX otherwise. FX continues the development and improvement of all the
products and therefore it may happen that a new version of mufer with improved
performance or reliability characteristics will be available later on as an optional
part or for some particular track conditions some specic mufer should be used.
All this information you will nd at the FX web site www.FX-engines.com
For maximum performance and reliability use only the original FX manifold. There
are different types of the FX manifolds each designed for the particular track
conditions and for the particular engine. Please refer to the exploded Parts List
of your engine for the list of suggested manifolds. If your engine was supplied as
a combo use the manifold supplied. Typically there are three different lengths of
a manifold:
= Short Suggested to be used for tracks with long main straights and to
achieve the highest RPM but lower performance from bottom.
= Medium Suggested to be used for medium or standard tracks.
= Long Suggested to be used for short tracks where the performance
from bottom is required but the RPM will be lower.
The venturi, sometimes called a carburetor reducer or restrictor is an insert in the
carburetor which controls the amount of air that will go into the carburetor.
The smaller diameter of the venturi used, the higher run time you will achieve
however the carburetor will be more difcult to tune.
The larger diameter of venturi used, the larger the amount of air ow into the engine
for cooling.
The colder the air temperature, the smaller diameter of the venturi must be used.
The hotter the air temperature, the larger diameter of the venturi must be used.
Check for the Parts List included with this engine to determine which size of venturi
comes with this engine and use it for break-in procedure and as a standard basic
set-up. Anytime you get lost with the setting just return back to this basic venturi
size setting.
#658900 Composite Carburetor Venturi (Set)
The set includes venturi of size (mm): 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5
The thickness of the engine head shim installed inuences the volume of the
combustion chamber and compression which inuences the quality of fuel
combustion, performance and fuel consumption.
Check for the Parts List included with this engine to nd out which size of engine
head shim is installed and which size of engine shim is included in the packaging
for further tuning. Anytime you get lost with the setting just return back to the basic
engine head shim setting.
#655922 Heatsink Head Shim 16.4x22.8x0.2 (4)
#655923 Heatsink Head Shim 16.4x22.8x0.3 (4)
Use after the engine is run-in to increase power while
improving fuel consumption.
Use in altitudes higher than 300 meters.
Use for standard track conditions and for run-in.
With a glow plug engine, ignition is initiated by the application of a 1.5-volt power
source to pre-heat the glow-plug lament. When the battery is disconnected, the
heat retained within the combustion chamber remains sufcient to keep the plug
lament glowing, thereby continuing to keep the engine running. Ignition timing
is automatic which means under reduced load, allowing higher RPM, the plug
becomes hotter and, appropriately, res the fuel/air charge earlier; conversely, at
reduced RPM, the plug become cooler and ignition is delayed.
Your engine comes with a preinstalled glow plug and for break-in procedure and
for initial run use only this glow plug. The type and quality of glow plug used has
signicant inuence on performance and reliability of your engine. The FX glow
plugs are some of the highest quality glow plugs and are strongly recommended
for FX engines. Using any other glow plugs may have negative inuence on
performance and reliability of your engine.
Recommended for break-in procedure.
Recommended to use when racing in lower temperatures.
Recommended for shorter tracks.
Recommended for higher temperatures.
Recommended for longer tracks.
Recommended for nal runs.
Recommended for break-in procedure.
Recommended to use when racing in lower temperatures.
Recommended for shorter tracks.
Recommended for higher temperatures.
Recommended for longer tracks.
Recommended for nal runs.
Recommended for very high temperatures.
Recommended for very long tracks.
Recommended for long nals.
There are different types of glow plugs to be used for particular track conditions:
To check if the glow plug is still working, remove it from engine and insert into the
glow plug igniter to check that it glows bright red when energized. If the element
does not glow or is dull replace it with a new plug. The glow plug lament coil
(wire) must be shiny. It cannot be rough or detoriated.
Apart from when actually burned out, a plug may need to be replaced because it no
longer delivers its best performance, such as when:
Filament surface has roughened.
Filament coil has become distorted.
Foreign matter has adhered to lament; it will no longer have shiny
appearance.
When plug body has corroded.
Engine tends to cut out when idling.
Starting quality deteriorates.
When you have properly set carburetor while adding throttle the car
accelerates but then the engine suddenly stops.
The wire is shiny and without
any roughness.
The wire has rough and detoriated
surface.
Glow plug starter
Pliers
Particularly in the case of very high performance engines, glow plugs are considered
as a consumable part. The glow plug must be regularly replaced. You can extend
the life time of the glow plug and engine performance by careful use:
Install and use only original FX glow plugs.
Use fuel containing a moderate percentage of nitro methane unless more is
essential for racing events.
Do not run the engine too lean and do not leave the battery connected while
adjusting the needle.
Upper position TDC
2
2
3
3
11Upper position TDC
Remove Back plate
Install Back plate
Remove all screws Tighten all screws securely
After installation of the rear cover tighten the screws securely. When the screws
are not tightened securely, the pressure inside the engine can push against the
backplate, causing it to move, resulting in potential damage to the internal engine
components.
Anytime before you open or close the rear cover you need to turn the ywheel
assembly (clutch) on the crankshaft so you feel that the piston is in the upper part
of the sleeve, which means the piston is in upper position TDC (Top Dead Center).
Failure to do so and opening or installing the engine rear cover may damage the
piston.
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