FS-B400AC
OPERATING MANUAL
>Also,Please study the entire contents of this instruction manual,so as to familiarize yourself with
engine controls and other functions.
>Furthermore,Keep these instructions in a safe place so that you may readily refer to them
whenever Necessary
Thank you for Choosing our products,Model FS-B400AC is one accessories kit with
Precise
Inline Twin Cylinder Four-stroke model engine,Before assemblying and operating your engine,please
read the"safety instructions and warnings" section on pages 2-3 of this booklet and contents of
accessories assemblyl,to strictly adhere to the advice contained therein
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Safety Introduction and Warnings
CATALOGUE
Product Introduction
Product Assembly Steps
Wiring Diagram
Precautions for Startup
Stable Operation and Adjustment
Regular Cleaning and Maintenance
Replacement of Operating Components
Troubleshooting Methods for Engine Failure to Start Normally
Three Views
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Multi-view
Exploded View
Commitment
Part List
SAFETY INSTRUCTIONS AND WARNING
2
S
Remember that your engine is not a "toy", but a high-efficiency internal combustion engine, the
output power may cause you harm, or other effects, do not change or disassemble
The advice which follows for all production engines ,Incorrect operation or Ignore safety can
lead to engine damage or dange
As a professional user, please make sure the engine runs safely and carefully.
If at some future date, your
FS-B400AC
is acquired by another person, we would respectfully request
that these instructions are also passed on to its new owner.
r
Warning: These cover events which might involve serious (in extreme circumstances, even fatal )injury.
Model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth.
Always store it in a clearly marked container and out of the reach of children.
Model engine fuel is also highly flammable. Keep it away from an open flame, excessive heat, sources
of sparks, or anything else which might ignite it. Do not smoke or allow anyone else to smoke, nearto it.
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust
deadly carbon-monoxide. Run your engine only in an open area.
Model engines generate considerable heat. Do not touch any part of your engine until it has cooled.
Contact with the muffler,cylinder head or exhaust header pipe, in particular, may result in a serious burn.
3
This engine was designed for science experiments, model demonstrations, model car drives. Do not
attempt to use it for any other purpose.
Mount the engine in your model securely, following the manufacturers' recommendations, using
appropriate screws and locknuts.
Noise will happen when starts, please buy our matching muffler exhaust pipe or run away from the
living environment, because the noise of the operation may irritate others.
Safety glasses are strongly recommended.
Please note that the electric plug or battery wire should not touch the rotating parts. Also check
whether the connection of the throttle rocker arm is firm.
Tobe safe, keep all spectators (especially children) at least 3 meters away from engine when start the
engine.
If you want to stop engin, shut off the throttle completely. In an emergency, clamp the fuel line in front
of the carburetor to cut off the fuel supply
Do not attempt to remove the flywheel and start the synchronous pulley
Do not extend the starting battery wire by more than 20cm. Otherwise, the starting current will be
insufficient due to the resistance voltage drop inside the battery line
When starting the engine, please do not press the start button for a long time. The maximum starting
time is 5 seconds. If it does not start, please stop for 15 seconds and press the button to start again,
so as not to burn the starting motor and ignition circuit due to the long starting
Heat dissipation impeller cover
Heat dissipation impeller
Drive belt
Large pulley
Intake duct
Air intake installation seat
Carburetor mounting base
Cylinder head cover
Timing wheel set housing
Hot head installation port
Right exhaust pipe
Bracket base
Carburetor
Silencer
Timing wheel set housing cover plate
4
INTRODUCTION
engine structure and components
Rocker arm linkage
Cylinder head
Starting pulley
Air deflector
Oil inlet nozzle
Cylinder block
Left exhaust pipe
Oil discharge nozzle
Flywheel
Starting belt
Starting wheel
5
INTRODUCTION
engine structure and components
TOYAN
拓陽精密科技
6
Φ2×12 Φ2×3
M3
M2
M2×8
M2.5×4
M2.5×5
M2.5×6
M3×6
M3×12
M3×8
M3×10
M3×14
M3×16
M3×25
M3×4
M3×8
M4×14
M4×16
M2.5×5
M2.5×8
M3×6
M2.5×8
M2.5×16
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Distribution diagram of parts packaging
TOYAN
拓陽精密科技
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Distribution diagram of parts packaging
TOYAN
拓陽精密科技
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Distribution diagram of parts packaging
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拓陽精密科技
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Distribution diagram of parts packaging
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拓陽精密科技
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Distribution diagram of parts packaging
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拓陽精密科技
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Distribution diagram of parts packaging
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M2×12
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Product assembly steps
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40
Product assembly steps
The piston ring and cylinder liner shall be
matched one by one, and
the corresponding cylinder liner
4
37
Product assembly steps
When disassembling, it is necessary to
maintain the original pairing and not
confuse it. During installation, the concave
points at the arrow should also be kept
corresponding.
Attention!
5
Product assembly steps
Install the marked point on one side facing outward
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94
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Product assembly steps
Completion
diagram
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Product assembly steps
Completion
diagram
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Product assembly steps
Completion
diagram
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Product assembly steps
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Product assembly steps
Completion
diagram
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Product assembly steps
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Product assembly steps
Completion
diagram
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
Completion
diagram
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Product assembly steps
When installing the belt, ensure
that these three points are located
as shown in the figure
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Product assembly steps
Completion
diagram
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Product assembly steps
Completion
diagram
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Product assembly steps
Completion
diagram
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*Screw alignment positions that are not clearly shown
refer to the corresponding letters
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Product assembly steps
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Product assembly steps
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Product assembly steps
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Product assembly steps
Wiring diagram
41
Ignition
Module
GAS
Li
7.4V-2S
Grounding
INSTALL THE BASE
Make sure the surface of engine mounting is flush and in the same flat. Improper
installation may lead to deformation of crankcase, bearing, etc. Unstable operation and
performance degradation will happen. The 3.0mm hexagon socket screws are recom-
mended when fixed engine. If installed on other engine platforms, please purchase
adjustment pads to fit between the engine bracket and the engine.
ATTENTION ABOUT STARTING
42
For the sake of safety, it is strongly recommended not to disassemble the engine and start the
mechanism. If any starting problems, please contact your local dealer or
TOYAN
TOYAN
technician to solve
them. If return to the factory for testing, will provide you with high-quality after-sales service.
If any problem caused by unauthorized disassembly, you will bear the corresponding responsibilities
and expenses
1 Glow plug
Model FS-B400AC requires 2 special glow plug for a four-stroke methanol engine , which is
started
by using 1.5 volt power supply. When the battery is disconnected, the heat retained in the chamber is
still enough to heat the filament to keep the engine running. When top center compression position is
reached, an "automatic" ignition burst is achieved, while the spark plug remains at high temperature,
allowing for higher rotational speeds while the load is reduced. In contrast, if the RPM is low, the spark
plug will cool, and if the RPM is too low, the ignition will stop, and then the engine will stop. Therefore,
you can control the engine speed by adjusting the damper to achieve the best effect you want.
2.Fuel
Please use quality guaranteed methanol model engine fuel. Self - dispensing or counterfeit fuel will
greatly reduce the performance and life span of the engine. Since it is a four-stroke engine, in order to
ensure the normal operation of the engine, we require the only 20-25% nitro methane fuel can be
used. If high nitro fuel is used, the ignition time and cylinder pressure of the engine will be greatly
affected, and the normal and stable operation cannot be maintained.
Remind!
3.Fuel tank
When the nitro content of the fuel increases or the brand of fuel change , it is recommended to
use oil-rich needle adjustments to run the engine so that the optimal setting for the new fuel can
be rechecked, (please adjust the ratio of gasoline fuel to 1:25 to 1:30, and use 2T engine oil).
If the engine is running at very high speeds and on high nitro fuel,The life of the spark plug
does not last long. Please note that engine fuel is toxic. Keep it out of contact with eyes or
mouth and always store it in a clearly marked container and place, and keep out of reach of
children. It is highly flammable. Keep away from open fires, overheating or any source of
ignition
It is recommended to use a 100cc tank. The tank should be installed on the same flat as the engine.
The gap between the fuel inlet & outlet of the fuel tank and carburetor should be kept within 1 cm
(the carburetor must be higher than the fuel inlet & outlet of the fuel tank). If the gap is too high,
the carburetor's working efficiency will be reduced and the engine will be started adversely. To
ensure clean fuel supply, pls use standard 5mm silicone tubing and properly install oil filters. Since
the engine itself relies on negative pressure to absorb oil, it is recommended the muffling exhaust
pipe can be used to pressurize the fuel tank
43
4.Start power supply
5.Environment for starting
The series FS-B400AC has been installed with a start motor, which can be started with one button.
You only need to purchase standard 7.4v 25C lithium battery to realize quick start. Too low or
too high voltage of starting battery will not guarantee the service life of the starting motor, do
not use incorrect voltage starting battery
Please start the engine in an open, airy environment to avoid discomfort from burning gases
6.Platform for Starting
Since the engine will produce some vibration after starting, please place it on a stable and flat
platform
7.Heat dissipation
Since the engine has been cooled by a fan, high-speed rotating fan blades will be dangerous,
do not touch. If you find cracks in the blade during use, please replace in time
Remind!
Every time you start the engine, please carefully check whether there are cracks in the blades.
we must replace new if any cracks to avoid the danger of blade spread out during high-speed
operation
44
45
OPERATION AND ADJUSTMENT
Note
Four-stroke engines have stronger torque output than two-stroke engines, so the
corresponding measures should be taken during operation
1. Check the timing belt and CAM axle box
Please make sure that the marking points on the two pulley can be down at the same time,see P43.
Open the hood and add the grease. Since the mounted CAM is used, please add the solid grease to ensure
stable operation and avoid dry friction of the CAM.
In order to extend the service life and improve the performance, each engine has been tested at
the factory. You need to do proper running-in and cleaning after receiving the engine. After
continuous running in, the cylinder pressure will be gradually strengthened. Due to the high
simulation degree of this engine and the large number of various parts, we do not recommend
you to fully disassemble the engine, we will provide a variety of effective sales to help you
maintain and stable use
2. Check the power supply
Please confirm that the voltage of 7.4v universal ignition power supply is normal, and full
of electricity
3. Initial Oil Needle Setting
The prerequisite is adequate lubrication and cooling. The engine is run with very important oil
needle settings: The excess oil not only provides rich lubrication, but also conducts heat from
the surrounding metal and further assisted by the fuel nitro methane. the two-stroke model
46
engines in pre-heating into the cylinder through the crankcase on a longer trip. But The
four-stroke engine, with its intake pipe and carburetor mounted high on the cylinder cap, means
that the rich mixture of cooling fuel and air will flow directly into the cylinder directly.With the
help of fan cooling, it can provide excellent operation experience for every enthusiasts. You can
also buy the
OTTO series of water cooling accessories, so that your engine will be able to
maintain stable operation for a long time.
Remind!
When leaving the factory, each engine has completed the oil needle setting. If you have
misadjusted the oil needle during the use, it is recommended to adjust the main oil needle
to 2.0 laps and the auxiliary oil needle to 1.5 laps. Since the methanol engine needs to
maintain the temperature of the spark plug filament to achieve ignition, when the engine is
in the oil rich state for a long time at low speed, the temperature of the filament will
gradually reduce, resulting in ignition difficulty. Therefore, it is necessary to up the speed
for cleaning oil at intervals to avoid oil enrichment at low speed
1.5mm
Please keep the throttle
opening larger than 1.5mm
Loosen the throttle
screw and adjust the
size of the throttle
4
4. Start
Remind!
It is important to put the throttle in the right position before starting the engine. It is
recommended that the throttle be opened at 30% to start, the engine is not allowed to open
the throttle too far under "no load" conditions, which can quickly overheat and can seriously
damage the engine piston ring and cylinder sleeve.
Connect the spark plug battery and press the start button. Once the engine starts,
disconnect the spark plug battery and keep the engine running slowly under the oil-rich
needle setting. (If necessary, gently adjust the throttle lever to keep the engine idle steady.)
7
Since a four-stroke engine requires a lot of air intake, it is important to set throttle
screws , the minimum throttle opening (idling setting) is about 1.5mm.,For the use of
all kinds of engine enthusiasts. do not use a strong force to twist the throttle valve
screws to adjust the size of the throttle door opening, but using valve screws to loose
throttle, and then pull the throttle rocker arm to adjust. As shown in figure
48
Rich oil
Lean oil
Idling Stop
If the engine stops, cooling it for 15 seconds before restarting. Please hold down the start key
within 5 seconds for each start, so as to protect the start motor life. Allow the engine to warm
up for 30 seconds after starting so that the oil in the fuel can be fully lubricated to each working
part. When the engine rapidly drops from high speed to low speed, or when low speed rapidly
rises to high speed, the engine is unstable or the throttle control is slow or flashover, please
confirm the carburetor working status
When the engine has more fuel , smoke is emitted or accelerates slowly, indicating that the
engine has excessive oil, please turn the main oil needle clockwise, 15° as a unit, gradually
reduce the main oil needle, until the sound of engine exhaust is soft and strong, and the
exhaust pipe slightly smokes and the lubricates fuel spray out
If the sound of the engine is too sharp, like the sound of dry friction between metals, the
temperature rises rapidly, and the engine is stopped immediately after acceleration, indicating
that the engine has low oil, please turn the main oil needle counterclockwise, 15° as a unit,
gradually reduce the main oil needle, until the sound of engine exhaust is soft and strong, and
the exhaust pipe slightly smokes and the lubricates fuel spray out
When the engine speed changes rapidly, suddenly adjust from the high speed to the low
speed, the flameout occurs, please confirm whether the throttle is closed less than 1.5mm, or
gradually reduce the auxiliary oil needle, (clockwise rotation) gradually adjust the auxiliary oil
needle, 20°as units, until the engine maintains a steady idle speed. In the debugging process,
the auxiliary oil needle should not be excessively reduced, so as not to cause engine have lean
oil, we recommend that the minimum value of auxiliary oil needle should not be less than 1
turn.
49
CARE AND MAINTENANCE
The series of FS-B400AC is a very precise machine that you need to clean timely. Due to the impact
of environment and the fuel when using, the engine parts have a certain amount of wear and
corrosion. So,
TOYAN will also provide you with long-term maintenance services. You can also
complete the basic cleaning and maintenance
Carefully clean the carburetor and remove dirt and grease from the inlet
If an air filter is used, make sure the filter is clean and free from blockage
Recommended that the air core used for more than one hour should be replaced in time.
Be careful to remove contaminated filter elements to ensure that dirt does not enter the
carburetor
Do not remove timing synchronous belt, you can use alcohol as a cleaning agent to wipe the belt. Do
not use corrosive detergent to clean synchronous belt, to avoid damage
Glow Plug must be treated as consumables. Long running glow plug will not ensure the normal operation
of the engine and you can extend its life maintain the performance of the engine if you use it carefully,
Use appropriate tools for disassembly
Use fuels containing a moderate percentage of nitromethane
Do not overtilt the engine and do not connect the battery while adjusting
The time to replace the glow plug. expect burned, It also need to be replaced on these situations because
it no longer provides optimal performance,
For example:
a.The surface of the filament becomes rough and white
b.Filament curl deformation
c.External material adhered to the filament or plug corrosion
d.The engine will power off when idling
e.The power went out after the engine started
Note!
These maintenance programs will be stored after a period of time, and there is a risk of
corrosion or startup difficulties, if you need someone to deal with, please contact us
Replacement of running parts
At the end of each operation, empty the fuel tank, energize the glow plug, and try to
restart the engine to burn the possible left fuel in the fuel tank. Repeat this process until
the fuel is cleared from the engine.
Inject some antiseptic oil and briefly start the motor to distribute the oil to the working
parts. Do not inject this oil into the lubricator nozzles, as this may cause the O ring of the
carburetor to deteriorate Add solid lubricant to camshaft and valve tappet to ensure that
the CAM axle box has enough lubricant for each operation
5
After long-term operation, the friction between the engine components will cause wear and
too large gap, the replacement of related parts will help you maintain your engine better.
When you are in the process of use, there is not flexible start, power reduction, idle speed
instability and so on, please feedback your usage process and poor performance of the
engine to the local dealer or , we will serve you wholeheartedly. Parts replacement, we
will provide professional equipment and experienced team. Please do not disassemble the
engine without professional tools to avoid the risk of uncontrollable damage to the engine
0
TOYAN
BUG CHECKING
If the engine fails to start, check the following carefully:
Whether the battery voltage is normal, whether the power is full
Whether the glow plug has failed
Whether the fuel can reach the carburetor smoothly
Do not start the engine when it is flooded. Remove the glow plug, close the oil needle and
press the start button to drain the excess fuel. (Cover the plug hole with a piece of woolen
cloth so that the fuel doesn't spill on you.) If forced to start without removing the excess
fuel, it may cause irreversible damage to the starting system, as well as the connecting
rod and crankshaft to strain and deformation
Timing belt adjustment
All OTTO Motor
have been tested for timing belt position before they leave the factory.
After several hours of execution, the operating power loss or engine running instability is
found, the timing belt needs to be tested and adjusted to get the correct ignition information
for the engine. Please check against page 11 of "timing belt timing diagram"
When Turn off at low speed, do not keep it at too low speed a long time. Since the methanol
engine needs to maintain the temperature of the spark plug filament to achieve ignition,
when the engine is in a rich state for a long time at a low speed, the temperature of the
filament will gradually decrease, resulting shutdown. Therefore, it is necessary wait a while to
up the speed oil and clean the oil to keep the temperature of the filament
51
52
FS-B400 Specification
·Displacement:3.5cc×4
·Bore: 16.68mm
·Stroke: 15.40mm
·Practical rpm: 4000-16000rpm
·Output: 2.00ps(30%Nitro)
·Weight: 1850g
Three
Views
153.5
140.5
154.5
53
Multi-view
54
Exploded view
Our Commitmen
55
t
Please contact a TOYAN dealer in your country or location. If you buy through the Internet,
you can also get various parts and complete services through the Internet. Detailed information
about each part can be obtained from the dealer
In the process of use, we have a professional team to answer your technical or usage
questions online for free.
If your distributor is unable to perform its technical services, we will provide you with direct
technical support
56
Cylindrical pinΦ2×12
Name Name Name
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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29
30
31
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34
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41
42
43
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2
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1
1
4
1
4
2
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2
8
1
7
Cylindrical pinΦ2×3
PART LIST
Flat washer
5
Elastic washer
3
Hex nut
2
Self tightening nut
7
Open retaining ring3.5mm
Open retaining ring2.5mm
8
2
Hexagon socket head
cap screw M2×8
Hexagon socket head
cap screw M3×12
Glib
Flat gasket
Cylinder head gasket
Oil nozzle adapter
Flywheel
Motor
Cylinder liner
Carburetor mounting base
Valve cover
Shell mounting plate (short)
Housing mounting plate (long)
Tensioning the installation plate
Crankshaft assembly
Piston connecting rod assembly
Heat dissipation impeller cover
Hexagon socket head
cap screw M3×8
Hexagon socket head
cap screw M3×10
Hexagon socket head
cap screw M3×14
Hexagon socket head
cap screw M3×16
Hexagon socket head
cap screw M3×25
Hexagon socket head
cap screw M3×4
Hexagon socket head
cap screw M3×6
Hexagon socket head
cap screw M3×8
Hexagon socket head
cap screw M4×14
Hexagon socket head
cap screw M4×16
Hexagon socket head
cap screw M2.5×5
Hexagon socket head
cap screw M2.5×8
Outer diameter 8X1 wire
diameter, fluorine rubber O-ring
Inner diameter 5x1-O ring
Hexagon socket head
cap screw M2.5×4
Hexagon socket head
cap screw M2.5×5
Hexagon socket head
cap screw M2.5×6
Hexagon socket head
cap screw M2.5×8
Hexagon socket head
cap screw M2.5×16
Hexagon socket head
cap screw M3×6
0
18
5
8
2
5
1
4
14
8
2
2
1
1
2
1
1
4
8
3
37
Name Name Name
PART LIST
Tensioning pressure plate Timing wheel set housing Rocker arm
Retaining ring
Pressure roller
Starting wheel
Large pulley
Flange bearing 8 × 22 × 7
Idler pulley tensioning plate
Rocker arm bracket
O-ring connecting shaft
Small pulley
Large starting pulley
Cylinder head cover
Air deflector
Carburetor
Exhaust pipe (right)
Cylinder head (left)
Cylinder head (right)
Crankcase
Cylinder block
Rocker arm linkage
Motor mounting base
Bracket base
Support
Synchronous belt B111MXL
Synchronous belt B200MXL
O-ring drive belt
Timing pulley A
Heat dissipation impeller cover
Mini pressure roller
Air intake installation seat
Tensioning the idler shaft
Flange bearing 5
×
10
×
4
Impeller shaft
Intake pipe installation plate
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46
47
48
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50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
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67
68
69
70
71
72
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75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
1 1 8
1
2
1
1
1
1
4
1
1
1
2
1
2
1
1
1
2
2
1
1
1
4
1
1
1
2
1
1
2
2
1
1
4
1
Camshaft (left)
Camshaft (right)
Intake duct
Bearing 5 × 8 × 2.5
Flange bearing 5 × 8 × 2.5
Bearing 12 × 18 × 4
Bearing 12 × 18 × 4
1
4
2
2
2
2
Insulation pad
Timing wheel set housing cover plate
1
1
Name Name Name
PART LIST
Hexagon socket head
cap screw M2×12
Exhaust pipe (right)
Silencer
Crankcase gasket (lower)
Crankcase gasket (upper)
Cylinder block gasket
Cylinder head cover gasket
Oil seal
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91
92
93
94
95
1
1
1
1
2
96
2
97
2
98
99
1
Self-tapping screws M2×12
2
