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(71641300)

P3

(71641400)

P4

(71641500)

P5

(72101272)

(72106137)

(22826140)

(72106042)

(72413000)

(72413200)

(71812000)

(71813000)

(72415000)

(72415200)

(72106192)

(72106190)

(22826140)

(72106042)

(72106480)

CARBURETOR ADJUSTMENT

Open

Close

Close

Open

Needle Valve

Metering Needle

More fuel

Less fuel

More fuel

Less fuel

Run the vehicle (with throttle fully open) over the 

longest available straight course a few times to 

observe the model’s speed. Return the vehicle to the 

starting point and close the Needle-valve 15°and 

repeat the run, taking note of the improvement in 

performance.

Continue with further runs, gradually reduce the 

Needle-valve setting aiming to achieve the highest 

straight-line speed (optimum position).

Remember, however, if the Needle-valve is closed too 

far, the engine will overheat, accompanied by visibly 

diminished exhaust smoke and the model will lose 

speed. At this point, throttle down immediately, stop 

the vehicle and reopen the Needle-valve 30~45°.

Carburetor adjustment should be carried out only after 

the running-in has been completed.

After setting the Needle-valve at optimum position, 

run the vehicle a few times at the straight line. 

With the engine running, close the throttle and 

allow it idle for about five seconds, then reopen the 

throttle fully. 

If, at this point, the engine puffs out an excessive 

amount of smoke and the vehicle does not 

accelerate smoothly and rapidly or even stops, it is 

probable that the idle mixture is too rich. In this 

case, turn the Metering needle clockwise 15~30°.

If, on the other hand, the engine tends to speed up 

momentarily and then cut out abruptly when the 

throttle is opened, the idle mixture is too lean. In 

this case, turn the Metering needle counter-clockwise 

15~30°.

CARE AND MAINTENANCE

1.

2.

3.

The minute particles of foreign matter, that are present in 

any fuel may, by accumulating and partially obstructing 

fuel flow, cause engine performance to become erratic 

and unreliable. O.S. 'Super-Filters' (large and small) are 

available, as optional extras, to deal with this problem. 

One of these filters installed to the pickup tube inside 

your refueling container, will prevent the entry of foreign 

material into the fuel tank. It is also recommended that a 

good in-line filter be installed between the tank and 

carburetor.

Do not forget to clean the filters regularly to remove 

dirt and lint that accumulate on the filter screens. 

Also, clean the carburetor itself occasionally.

At the end of each operating session, drain out any fuel 

that may remain in the fuel tank. Afterwards,energize 

the glow-plug and try to restart the engine, to burn off 

any fuel that may remain inside the engine. Repeat this 

procedure until the engine fails to fire. Do this while the 

engine is still warm. 

4. Then, inject some after-run oil into the engine, and 

rotate the engine with an electric starter for 4 to 5 

seconds to distribute the oil to all the working parts.

Note:

Do not inject after-run oil into the carburetor as 

this may cause the O-rings inside the carburetor to 

deteriorate. These procedures will reduce the risks 

of starting difficulties or corrosion after a period of 

storage. 

Dirt and dust may lodge in        marked places.

5. Finally, when cleaning the exterior of the engine, use 

methanol or a household cleaning agent. Do not use 

gasoline, kerosene, or any petroleum based chemical 

which can damage silicone fuel tubing.

CHECKING THE ENGINE

If the engine will not develop normal performance after 

long time running due to wearing of parts.  It is suggested 

to replace necessary parts when the following symptoms 

are detected.

Engine sound changes and easily overheats.
Power has dropped extremely.

Idle is unstable and/or engine tends to stop at idle.

In most cases, ball bearings, cylinder & piston assembly, 

connecting rod and/or crankcase have become worn.  

Check the parts carefully and replace them if necessary.

O.S. GENUINE PARTS & ACCESSORIES

71410150

71410200

71410250

71410300

71411200

71411250

71412300

71413550

71413600

71413700

O.S. SPEED HEX WRENCH DRIVER 1.5
O.S. SPEED HEX WRENCH DRIVER 2.0
O.S. SPEED HEX WRENCH DRIVER 2.5
O.S. SPEED HEX WRENCH DRIVER 3.0
O.S. SPEED HEX BALL WRENCH DRIVER 2.0
O.S. SPEED HEX BALL WRENCH DRIVER 2.5
O.S. SPEED FLAT HEAD SCREWDRIVER 3.0
O.S. SPEED NUT DRIVER 5.5
O.S. SPEED NUT DRIVER 6.0
O.S. SPEED NUT DRIVER 7.0

O.S. SPEED DRIVER TOOLS

Code No.

Description

71414015

71414020

71414025

71414030

71414120

71414125

71414230

71414355

71414360

71414370

O.S. SPEED HEX WRENCH TIP ONLY 1.5
O.S. SPEED HEX WRENCH TIP ONLY 2.0
O.S. SPEED HEX WRENCH TIP ONLY 2.5
O.S. SPEED HEX WRENCH TIP ONLY 3.0
O.S. SPEED HEX BALL WRENCH TIP ONLY 2.0
O.S. SPEED HEX BALL WRENCH TIP ONLY 2.5
O.S. SPEED FLAT HEAD SCREWDRIVER TIP 3.0
O.S. SPEED NUT DRIVER TIP ONLY 5.5
O.S. SPEED NUT DRIVER TIP ONLY 6.0
O.S. SPEED NUT DRIVER TIP ONLY 7.0

Code No.

Description

O.S. GLOW PLUG

(71520100)

(71415100)

(71415200)

(71415300)

O.S. SPEED CLUTCH WRENCH & ADJUSTER

O.S. SPEED FLYWHEEL KEY

O.S. SPEED FLYWHEEL PULLER

O.S. SPEED PLUG WRENCH

T-2060SC WNI TUNED SILENCER COMPLETE SET

Exhaust Seal Ring (2pcs.)

Joint Spring (3pcs.)

Header Pipe Spring (2pcs.)

T-2090SC TUNED SILENCER COMPLETE SET

(71812100)

(71801100)

(71813100)

(71801100)

SUPER AIR CLEANER 203

203 Filter Element (4pcs.)

(For MUGEN)

(For KYOSHO)

28XZ Hyper Flywheel MUGEN

Collet

28XZ Hyper Flywheel KYOSHO

Collet

T-2090SC Tuned Silencer Assembly

Exhaust Seal Ring (2pcs.)

Joint Spring (3pcs.)

(72101272)

(22826140)

(72106440)

M2000SC Exhaust Header Pipe Assembly

Header Pipe Spring (2pcs.)

Exhaust Seal Ring (2pcs.)

(72101272)

(22826140)

Header Pipe Spring (2pcs.)

Exhaust Seal Ring (2pcs.)

28XZ HYPER FLYWHEEL SET

SUPER AIR CLEANER 204

204 Filter Element (4pcs.)

Warning!

Do not touch rotating parts, engine and silencer 

when stopping the engine as they become very hot, 

and contact with them may result in a serious burn.

To stop the engine, close the 

throttle to idle speed and shut it off 

completely with the trim lever on the 

transmitter then cut off the fuel 

supply by pinching the fuel delivery 

tube to the carburetor.

Fuel

How to stop the engine

(71533255)

5.5

(71533280)

8

(71533085)

8.5

(71533290)

9

CARBURETOR REDUCER

M2002SC EXHAUST HEADER PIPE ASSEMBLY

1.

2.

3.

NEEDLE VALVE ADJUSTMENT

METERING NEEDLE ADJUSTMENT

THROTTLE STOP SCREW ADJUSTMENT

If the engine runs too fast with the throttle closed, the 

throttle stop screw should be turned counter-clockwise 

to allow the throttle opening to be reduced.

OPTIMUM MIXTURE CONTROL POSITION

With the optimum mixture control position, light smoke 

is visible during high speed running and the engine rpm 

increase smoothly during acceleration. Carry out 

adjustment 1.~3. patiently until the engine responds 

quickly and positively to the throttle control. 

Remember that, if the engine is operated with the fuel/air 

mixture slightly too lean, it will overheat and run 

unevenly. As with all engines, it is advisable to set both 

the needle-valve and metering needle slightly on the rich 

side of the best rpm setting, as a safety measure.

Finally, beyond the normal break-in period, a slight 

readjustment toward a leaner needle setting may be 

required to maintain maximum performance.

Note:

Please regard the standard positions in the 

instruction manual as just a guide. Positions will 

vary due to the fuel and silencer used.  In general, 

if a fuel containing less nitromenthane is used, the 

needlevalve will need to be closed further.  

Remember, closing the needlevalve too far can 

cause rusting and damage to the engine.

Dirt and stain stuck on the engine and silencer/manifold 

cause lowering heat dissipation effect.  When dirt and 

stain are detected, remove the engine from the chassis 

and clean it with alcohol.

REMOVING DIRT/STAIN

When storing the engine, install the cap on the exhaust 

port, carburetor, etc. to prevent dust from entering the 

engine.

INATALLING DUST CAPS

PRESSURE CHAMBER SET

(71550000)

(71490000)

(71491000)

O.S. SPEED CARBURETOR REPAIR KIT 21

O.S. SPEED CARBURETOR REPAIR PARTS 21

O.S. SPEED Carburetor Repair Parts 21

(71491000)

(72506100)

2.5mm x 1000mm

(22826145)

(21817010)

O.S. SPEED CILICONE TUBE

O.S. SPEED EXHAUST SEAL RING 21

(

10pcs.

)

O.S. SPEED PISTON PIN RETAINER 4mm (6pcs.)

(71550001)

(71550002)

O.S. SPEED CLUTCH BEARING (1050ZZ 4pcs.)

O.S. SPEED CLUTCH BEARING (1050ZZ 10pcs.)

(5pcs.)

(3pcs.)

(73301612)

(73301812)

(22884254)

(73300305)

O.S. SPEED DUST CAP SET FOR 12-30 CLASS

3mm(2pcs.) / 16mm(2pcs.) / 18mm(1pc.)

DUST CAP SET 3mm

DUST CAP SET 16mm

(3pcs.)

DUST CAP SET 18mm

Summary of Contents for 21XZ-B Spec II

Page 1: ... compression WITHOUT the glowplug battery being reconnected Before starting the engine always check the tightness of all the screws and nuts especially those of joint and movable parts such as throttle arm Missing retightening the loose screws and nuts often causes the parts breakage that is capable of harming you ENGINE CONSTRUCTION With this engine the piston will feel tight at the top of its st...

Page 2: ...o Insulator The Mixture Control Valve For adjusting acceleration feeling Adjusting range should be within 1 turn Loosen the retainer screw rotate the carburetor to its correct position and make sure that it is pressed well down into the intake boss compressing the rubber gasket before retightening screw 1 2 Rotate the retainer nut gently until it stops Tighten a further 120 180 Rotate the retainer...

Page 3: ...O S SPEED HEX WRENCH DRIVER 3 0 O S SPEED HEX BALL WRENCH DRIVER 2 0 O S SPEED HEX BALL WRENCH DRIVER 2 5 O S SPEED FLAT HEAD SCREWDRIVER 3 0 O S SPEED NUT DRIVER 5 5 O S SPEED NUT DRIVER 6 0 O S SPEED NUT DRIVER 7 0 O S SPEED DRIVER TOOLS Code No Description 71414015 71414020 71414025 71414030 71414120 71414125 71414230 71414355 71414360 71414370 O S SPEED HEX WRENCH TIP ONLY 1 5 O S SPEED HEX WR...

Page 4: ... O Ring Needle Assembly O Ring 2pcs Needle Holder Assembly Fuel Inlet No 15 Throttle Stop Screw O Ring 2pcs Mixture Control Valve Assembly O Ring L 2pcs O Ring S 2pcs Carburetor Body w Thermo Insulator Thermo Insulator Carburetor Rubber Gasket Carburetor Sealing Washer marked parts are available only for limited period one year after finishing the production Outer Head Inner Head Head Gasket 0 2mm...

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