BASIC ENGINE PARTS The Metering Needle: STARTING THE ENGINE & RUNNING-IN ('Breaking-in) For adjusting idle and acceleration feeling. Running- in is a procedure for an engine to come Outer Head close to actual running conditions (fuel, r.p.m., O.S. SPEED R2101 Ball Link engine temperature, etc.). [Standard Position] It is of vital importance, before attempting to operate your Install an effective silencer (). Frequent close Excessively rich running and prolonged low speed Type 21M2(B) Flush with the ball link body. running should be avoided. Prolonged low speed engine, to read the general 'SAFETY INSTRUCTIONS WARNINGS exposure to a noisy exhaust (especially in the case Exhaust running and low temperature running may result AND WARNINGS' in the following section and to strictly fuel is poisonous. Do not of the more powerful highspeed engines) may eventually impair your hearing and such noise is in the oil in the fuel becoming gelled and the adhere to the advice contained therein. allow it to come into contact with the eyes Metering Needle /liner becoming stuck together. or mouth. Always store it in a clearly marked also likely to cause annoyance to others over a wide Also, please study the entire contents of this Slide Valve container and out of the reach of children. area. PRESSURIZED FUEL SYSTEM instruction manual, so as to familiarize yourself with Cover Plate Carburetor Body the controls and other features of the engine. Model engine fuel is also highly flammable. The wearing of safety glasses is also strongly It is recommended that a muffler pressurized fuel recommended. feed system be used so that the fuel may be stably Keep it away from open flame, excessive The Stop Screw: SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE heat, sources of sparks, or anything else Take care that the glowplug clip or battery leads do fed to the carburetor. For setting the minimum idle speed: Remember that your engine is not a " toy ", but a which might ignite it. Do not smoke or allow not come into contact with rotating parts. Also check The following procedure is suitable when a fuel highly efficient internal- machine whose anyone else to smoke, near to it. that the linkage to the throttle arm is secure. Mounting Lugs [Standard Position] containing 25% nitro-methane is used. power is capable of harming you, or others, if it is Model engines generate considerable For their safety, keep all onlookers (especially small Approx 0.5mm 1. Set the carburetor controls at the standard positions misused or abused. As owner, you, alone, are children) well back (at least 20 feet or 6 meters) heat. Do not touch any part of your engine Crankshaft Bearing (Front) (positions when the engine leaves the factory.) responsible for the safe operation of your engine, so when preparing your model for running. act with discretion and care at all times. If at some until it has cooled. Contact with the 2. Switch the transmitter and make sure that each INSTALLATION OF THE STANDARD ACCESSORIES future date, your O.S. engine is acquired by another muffler (silencer), head or Before starting the engine, always check the linkage moves correctly. person, we would respectfully request that these exhaust header pipe, in particular, may tightness of all the screws and nuts especially those INSTALLATION OF THE TAPER COLLET instructions are also passed on to its new owner. result in a serious burn. of joint and movable parts such as throttle arm. Insert the taper collet on the crankshaft, taking care Carburetor Body Slide Valve 3. Make sure rotating direction of the box is Missing retightening the loose screws and nuts Note: correct (counter-clockwise seen from the front edge The advice which follows is grouped under two Never operate your engine in an enclosed space. not to push the crankshaft back so that it contacts the often causes the parts breakage that is capable of Sketch shows the carburetor reducer removed. of the crankshaft), and turn the engine with the headings according to the degree of damage or Model engines, like automobile engines, exhaust coverplate face. harming you. NOTE: While the Mixture Control Valve and the starter box to draw fuel into the engine. danger which might arise through misuse or neglect. deadly carbon-monoxide. Run your engine only in Cover Plate an open area. To stop the engine, fully retard the throttle stick and Metering Valve are set at the standard position 4. Connect glowplug battery lead to heat the plug and WARNINGS trim lever on the trans-mitter, or, in an emergency, when the engine leaves the factory, readjustment start the engine with the starter box. cut off the fuel supply by pinching the fuel delivery may be necessary, occasionally to allow for When the engine does not start or stops right after These cover events which might involve serious NOTES line from the tank. changes in fuel formula and climatic conditions being started, try the followings. (in extreme circumstances, even fatal) injury. This engine is intended for model . Do not Readjust the controls only when satisfactory Warning! Immediately after a glowplug-ignition engine attempt to use it for any other purpose. results cannot be obtained with the standard Close the needle-valve has been run and is still warm, conditions sometimes approx 1mm NOTES positions following the instructions mentioned in approx. 90° from the Mount the engine in your model securely, following exist whereby it is just possible for the engine to abruptly Taper Collet the “CARBURETOR ADJUSTMENT” section. standard position. These cover the many other possibilities, generally less the manufacturers' recommendations, using restart if it is rotated over compression WITHOUT the obvious sources of danger, but which, under certain Set the throttle opening a appropriate screws and locknuts. glowplug battery being reconnected. INSTALLATION OF THE CARBURETOR circumstances, may also cause damage or injury. little wider (approx. 1mm) ABOUT THE HEAD As delivered, the engine has its carburetor lightly installed than the standard setting NOTES ON OPERATION TOOLS, ACCESSORIES, etc. The engine is installed with a 0.1mm thick and a in the boss. Secure it as follows. by adjusting the Throttle 0.15mm thick gasket for 25% nitro fuel when it leaves Stop Screw. ENGINE CONSTRUCTION The following items are necessary for operating the engine. Rotate the retainer screw the factory. Adjust the total thickness according to ABOUT THE WARRANTY gently until it stops. 5. When the engine starts, warm it up by repeatedly With this engine, the piston will feel tight at the Items necessary for starting atmospheric temperature, humidity and glowplug Since this is a special SPEED version, individual increasing the rpm to medium speed and back top of its (TDC) when the engine is cold. FUEL used. This is normal. The cylinder has a slight special parts are available only for limited period again to a fast idle with the mixture set very rich, Generally, it is suggested that the user selects a fuel that is taper. The piston and cylinder are designed to (one year after finishing the production). Tighten a further glowplug connected, and the driving wheels clear of commercially available for model two-stroke engines When achieve a perfect running clearance when they Also, the engine is free of warranty due to damage CARBURETOR CONTROLS STANDARD POSITIONS 120-180 the ground. The rich mixture will provide adequate the brand of fuel is changed, or the nitro content increased, it reach operating temperature. and/or wear occurred during running. (POSITIONS WHEN THE ENGINE LEAVES THE FACTORY) lubrication and cooling, indicated by profuse is advisable to repeat the running-in procedure referred to in exhaust smoke. the RUNNING-IN paragraphs. Please note Four adjustable controls are provided on this Near TDC While Operating that with high-nitro fuels, although power carburetor. Attention: may be increased for competition purposes, Please do not run on a public street, this could Ball Link It is vitally important to set the cause serious accidents, personal injuries glowplug elements do not last as long and Retaining Pull out throttle at the correct position and/or propetry damage. engine life will be shortened. Carburetor Reducer Mixture Control Valve Screw before starting the engine. If "O" Ring Please do not run near pedestrians or small "O" Ring the engine is allowed to run Piston with the throttle too far open Cylinder children. To installed in the fuel line between fuel under ''no load'' conditions Liner Please do not run in small or confined areas. tank and carburetor to prevent foreign matter from entering the carburetor. (i.e. with the driving wheels not in contact with the Please do not run where loud noises can disturb ground) it will rapidly over-heat and may be Crankshaft others, such as hospitals and residential areas. GLOWPLUG IGNITER seriously damaged. Commercialy available handy glowplug 6. When the engine is warmed up, disconnect the Slight taper heater in which the glowplug battery and Dust Cover Throttle Stop Needle Valve 1. Loosen the retainer screw, rotate the carburetor to its NOTE glowplug battery and try running the on the battery leads are integrated. Metering Needle Screw correct position and make sure that it is pressed well track. If the engine stops soon after running at As delivered, the engine has the carburetor down into the intake boss, compressing the rubber around mid speed, the mixture is too rich. Close the lightly fit into its intake. Secure it changing its STARTER BOX The Needle-Valve: gasket, before retightening screw. angle according to the car chassis. For starting the engine. For adjusting air/fuel ratio (air-fuel mixture) at maximum needle-valve 30°. rpm (fully opened throttle). 2. Rotate the retaining screw gently until it stops, then If the engine still stalls, close the metering needle tighten a further 120-180 , and no more. 30°. Run the car on the track until one tank of fuel ABOUT THE ENGINE For filling the , a simple, polyethylene Close(Clockwise) Needle Valve Do not overtighten the screw as this will damage the has been consumed, then close the needle-valve When the engine is cold. When the engine is hot. The O.S. SPEED R2101 is a high performance "squeeze" bottle, with a suitable spout, is carburetor body. very little (within 10°). engine designed expressly for 1/8 On-Road Racing. required. Note 7. Repeat this procedure (close needle-valve very little The major parts have been refined to have a powerful O.S. SPEED SILICONE FUEL LINE (optional extra) Be careful not to damage the O rings when after one tank of fuel has been consumed) until approx. potential equal to more expensive specially tuned or removing the carburetor retainer from the engine. The connection between the fuel tank and the engine. Open 2 liters of fuel have been consumed, extending gradually NOTES WHEN APPLYING AN ELECTRIC STARTER First, remove the Retaining screw, then pull out modified engines. 2.5mm ID (Counter-clockwise) the full throttle running time at the straight. Carefully Do not over-prime. This could cause a each retainer. Do not push the retainers in or the O observe the exhaust smoke. hydraulic lock and damage the engine on rings will get damage. Be sure to run the engine with visible white smoke at [Standard Position] application of the electric starter. all times. If the smoke is not visible, the needle-valve Standard accessories TOOLS (optional extra) ENGINE INSTALLATION If over-primed, remove glowplug, close O.S. SPEED DRIVER TOOLS 3 turns opened from the fully closed position. is closed too far. needle-valve and apply starter to pump out Make sure that the vehicle's engine mounting surfaces [Fully closed position] Now the RUNNING-IN (Breaking-in) is completed. surplus fuel. Cover the head with a rag to Glow Plug RP7 are level and in the same plane. Poor installation may prevent any pumped out fuel from getting into T-type head (Turbo head) 1piece Turn the needle-valve clockwise until it stops. cause distortion of the crankcase, bearings, etc., Note: your eyes. This is the fully closed position. resulting in erratic running and loss of performance. In the event of any major working parts (e.g. Do not force it to turn further. The recommended screws for securing the engine are piston/cylinder liner assembly) being replaced or 3mm or 4-40 steel Allen hexagon socket type. If existing the fuel being changed, especially to high nitro Exhaust Seal Ring 1piece The Mixture Control Valve: holes in the engine mount do not align perfectly with fuel, the complete running-in should be repeated. engine mounting lugs, enlarge them slightly with a For adjusting acceleration feeling. How to stop the engine (Adjusting range should be within ±1 turn.) needle-file so that screws are in alignment with the mounting holes. To stop the engine, close the O.S. SPEED Collet 1piece throttle to idle speed and shut it off O.S. SPEED FLYWHEEL KEY [Standard Position] completely with the trim lever on the Flush with the carburetor body. transmitter then cut off the fuel supply by pinching the fuel delivery O.S. SPEED Dust Cap Set For 12-30 Class Do not allow bottom O.S. SPEED tube to the carburetor. 3mm,16mm,18mm 1piece each CLUTCH WRENCH & ADJUSTER of crankcase to touch chassis. Warning! Mixture Control Valve O.S. SPEED FLYWHEEL PULLER Do not touch rotating parts, engine Carburetor Body and silencer when stopping the Fuel O.S. SPEED PLUG WRENCH engine as they become very hot, Chamfer inside edges of bearers. and contact with them may result in a serious burn. FINAL ADJUSTMENT 3. At the end of each operating session, drain out any fuel O.S. SPEED CARBURETOR REPAIR KIT 21 ENGINE EXPLODED VIEW ENGINE PARTS LIST Final adjustment should be carried out only after the that may remain in the fuel tank. Afterwards,energize (71490000) Type of screw No. Code No. Description running-in has been completed. the glow-plug and try to restart the engine, to burn off O.S. SPEED Carburetor Repair Parts 21 C.M3x18 any fuel that may remain inside the engine. Repeat this (71491000) C...Cap Screw 1 2A004000 Outer Head procedure until the engine fails to fire. Do this while the O.S. SPEED CARBURETOR REPAIR PARTS 21 2 2A004100 Inner Head engine is still warm. Needle Valve Metering Needle (71491000) 3 2A004160 Set (0.1mm/0.2mm) 4. Then, inject some after-run oil into the engine, and 1 4 2A003010 Built-Up Parts Set rotate the engine with an electric starter for 4 to 5 O.S. SPEED CLUTCH BEARING (1050ZZ 4pcs.) Open Close Open Close 4-1 Cylinder & Piston Assembly seconds to distribute the oil to all the working parts. (71550001) 2A003000 4-2 22016000 Piston Pin Note: O.S. SPEED CLUTCH BEARING (1050ZZ 10pcs.) 4-3 21817010 O.S. SPEED Piston Pin Retainer 4mm (6pcs.) Do not inject after-run oil into the carburetor as (71550002) 2 4-4 23755020 this may cause the O-rings inside the carburetor to O.S. SPEED CILICONE TUBE More fuel Less fuel More fuel Less fuel Carburetor Complete (Type 21M2(B)) deteriorate. These procedures will reduce the risks (72506100) 2.5mm x 1000mm 5 2A081001 of starting difficulties or corrosion after a period of 3 6 23981740 Carburetor Retainer Assembly storage. O.S. SPEED EXHAUST SEAL RING 21(10pcs.) 6-1 24881824 "O" Ring (2pcs.) 1. NEEDLE VALVE ADJUSTMENT (22826145) 5. Finally, when cleaning the exterior of the engine, use 7 23731000 Crankshaft Ball Bearing (Front) Run the vehicle (with throttle fully open) over the methanol or a household cleaning agent. Do not use O.S. SPEED PISTON PIN RETAINER 4mm (6pcs.) 4 8 2A001000 Crankcase longest available straight course a few times to gasoline, kerosene, or any petroleum based C.M2.6x7 observe the model’s speed. Return the vehicle to the (21817010) 9 23730020 Crankshaft Ball Bearing (Rear) chemical which can damage silicone fuel tubing. 4-1 starting point and close the Needle-valve 10~15°and O.S. SPEED FLYWHEEL COLETTE (2pcs.) 10 2A002000 Crankshaft repeat the run, taking note of the improvement in Dirt and dust may lodge in marked places. (71801110) 4-3 11 23107100 Cover Gasket performance. O.S. SPEED DUST CAP SET FOR 12-30 CLASS Continue with further runs, gradually reduce the 12 2A007000 Cover Plate 3mm(2pcs.) / 16mm(2pcs.) / 18mm(1pc.) 4-2 Needle-valve setting aiming to achieve the highest 71642070 Glow Plug RP7 (22884254) 4-4 straight-line speed (optimum position). 5 22826140 Exhaust Seal Ring (2pcs.) 12 Remember, however, if the Needle-valve is closed too DUST CAP SET 3mm (5pcs.) 71801110 O.S. SPEED Flywheel Collet (2pcs.) far, the engine will overheat, accompanied by visibly (73300305) 11 O.S. SPEED Dust Cap Set For 12-30 Class diminished exhaust smoke and the model will lose 22884254 (3pcs.) 10 3mm (2pcs.)/16mm (2pcs.)/18mm (1pc) speed. At this point, throttle down immediately, stop DUST CAP SET 16mm C.M2.6x18 the vehicle and reopen the Needle-valve 30°. (73301612) * marked parts are available only for limited period (one year after finishing the production). DUST CAP SET 18mm (3pcs.) 2. METERING NEEDLE ADJUSTMENT 9 ( ) (73301812) 6 CAP SCREW SETS 10pcs./set The specifications are subject to alteration for improvement without notice. After setting the Needle-valve at optimum position, Code No. Size Pcs. used in an engine run the vehicle a few times at the straightway, and 79871020 M2.6x7 Cover Plate Retaining Screw (4pcs.) REMOVING DIRT/STAIN O.S. SPEED CLUTCH WRENCH & ADJUSTER stop the vehicle. With the engine still running, close (71415300) 8 6-1 79871055 M2.6x18 Carburetor Retainer Retaining Screw (1pc.) Dirt and stain stuck on the engine and silencer/manifold the throttle and allow it idle for about five seconds, 7 79871180 M3x18 Retaining Screw (4pcs.) then reopen the throttle fully. cause lowering heat dissipation effect. When dirt and O.S. SPEED FLYWHEEL KEY stain are detected, remove the engine from the chassis If, at this point, the engine puffs out an excessive (71415200) CARBURETOR EXPLODED VIEW CARBURETOR PARTS LIST amount of smoke and the vehicle does not and clean it with alcohol. accelerate smoothly and rapidly or even stops, it is O.S. SPEED FLYWHEEL PULLER No. Code No. Description INATALLING DUST CAPS probable that the idle mixture is too rich. In this (71415100) Type of screw 1 22082600 Mixture Control Valve Assembly case, turn the Metering needle clockwise 30~45°. When storing the engine, install the cap on the exhaust C...Cap Screw S...Set Screw O.S. SPEED PLUG WRENCH 2 1-1 46066319 "O" Ring (L) (2pcs.) If, on the other hand, the engine tends to speed up port, carburetor, etc. to prevent dust from entering the (71520100) 5 2-1 22781800 "O" Ring (S) (2pcs.) momentarily with little smoke and then cut out engine. 5-1 1-2 O.S. SPEED DRIVER TOOLS 22082970 Needle Assembly abruptly when the throttle is opened, the idle 5-1 2 mixture is too lean. In this case, turn the Metering CHECKING THE ENGINE Code No. Description 2-1 46066319 "O" Ring (2pcs.) needle counter-clockwise 30~45°. If the engine will not develop normal performance after 71410150 O.S. SPEED HEX WRENCH DRIVER 1.5 3 3 22082940 Needle Holder Assembly long time running due to wearing of parts. It is suggested 3. THROTTLE STOP SCREW ADJUSTMENT 71410200 O.S. SPEED HEX WRENCH DRIVER 2.0 4 No.15 Universal Nipple Assembly to replace necessary parts when the following symptoms 3-1 3-1 22082950 If the engine runs too fast with the throttle closed, the 71410250 O.S. SPEED HEX WRENCH DRIVER 2.5 are detected. 4 22848160 Throttle Stop Screw throttle stop screw should be turned counter-clockwise O.S. SPEED HEX WRENCH DRIVER 3.0 4-1 71410300 4-1 27881820 "O" Ring (S) (2pcs.) to allow the throttle opening to be reduced. Engine sound changes and easily overheats. 71411200 O.S. SPEED HEX BALL WRENCH DRIVER 2.0 5 71533085 Carburetor Reducer (8.5mm Red) Power has dropped extremely. 71411250 O.S. SPEED HEX BALL WRENCH DRIVER 2.5 1-1 OPTIMUM MIXTURE CONTROL POSITION 1-2 7 "O" Ring (1pc.) 71412300 O.S. SPEED FLAT HEAD SCREWDRIVER 3.0 8 5-1 22615000 With the optimum mixture control position, light smoke Idle is unstable and/or engine tends to stop at idle. 71413550 O.S. SPEED NUT DRIVER 5.5 6 22082110 Carburetor Body is visible during high speed running and the engine rpm In most cases, ball bearings, cylinder & piston assembly, 6 8-1 71413600 O.S. SPEED NUT DRIVER 6.0 1 7 22082200 Slide Valve increase smoothly during acceleration. Carry out connecting rod and/or crankcase have become worn. adjustment 1.~3. patiently until the engine responds 71413700 O.S. SPEED NUT DRIVER 7.0 8 2A081610 Metering Needle Assembly Check the parts carefully and replace them if necessary. 11 9 quickly and positively to the throttle control. 10 8-1 27881820 "O" Ring (S) (2pcs.) Remember that, if the engine is operated with the fuel/air O.S. GENUINE PARTS & ACCESSORIES Code No. Description 10-1 9 23981520 Dust Cover mixture slightly too lean, it will overheat and run O.S. GLOW PLUG 71414015 O.S. SPEED HEX WRENCH TIP ONLY 1.5 10 23781400 Ball Link No.3 unevenly. As with all engines, it is advisable to set both S.M3x3 (71642070) O.S. SPEED HEX WRENCH TIP ONLY 2.0 the needle-valve and metering needle slightly on the rich RP6 (71642060) RP7 71414020 10-1 26381501 Set Screw (1pc.) side of the best rpm setting, as a safety measure. RP8 (71642080) 71414025 O.S. SPEED HEX WRENCH TIP ONLY 2.5 11 29015019 Carburetor Rubber Gasket O.S. SPEED HEX WRENCH TIP ONLY 3.0 Finally, beyond the normal break-in period, a slight OUTER HEAD 8S O.S.SPEED R2101 71414030 * marked parts are available only for limited period readjustment toward a leaner needle setting may be (2A004001) 71414120 O.S. SPEED HEX BALL WRENCH TIP ONLY 2.0 (one year after finishing the production). required to maintain maximum performance. 71414125 O.S. SPEED HEX BALL WRENCH TIP ONLY 2.5 THREE VIEW DRAWING The specifications are subject to alteration for improvement without notice. T-2080SC TUNED SILENCER COMPLETE SET 71414230 O.S. SPEED FLAT HEAD SCREWDRIVER TIP 3.0 Dimensions (mm) Note: (72106850) 71414355 O.S. SPEED NUT DRIVER TIP ONLY 5.5 Please regard the standard positions in the T-2080SC Tuned Silencer Assembly 71414360 O.S. SPEED NUT DRIVER TIP ONLY 6.0 instruction manual as just a guide. Positions will (72106851) 71414370 O.S. SPEED NUT DRIVER TIP ONLY 7.0 vary due to the fuel and silencer used. In general, Joint Spring (3pcs.) if a fuel containing less nitromenthane is used, the (72106042) The specifications are subject to alteration for improvement needlevalve will need to be closed further. Exhaust Seal Ring (2pcs.) without notice. Remember, closing the needlevalve too far can (22826140) 78.6 cause rusting and damage to the engine. M2001SC Exhaust Header Pipe Assembly (72106870) Header Pipe Spring (2pcs.) UNF1/4-28 CARE AND MAINTENANCE 28 (72101272) 1. The minute particles of foreign matter, that are present in Exhaust Seal Ring (2pcs.) any fuel may, by accumulating and partially obstructing (22826140) fuel flow, cause engine performance to become erratic 15.6 and unreliable. SUPER AIR CLEANER 202 ASSEMBLY O.S. 'Super-Filters' (large and small) are available, as On-road Type (72412000) 31.6 29.5 44 20.5 optional extras, to deal with this problem. 202 Cleaner Body 45 One of these filters installed to the pickup tube inside (72412100) 4- 3.3 your refueling container, will prevent the entry of foreign material into the fuel tank. It is also recommended that a 202 Filter Element (4pcs.) Specifications (72412200) good in-line filter be installed between the tank and ■ Displacement 3.49 cc (0.213 cu.in.) carburetor. PRESSURE CHAMBER SET ■ Bore 16.08mm (0.633 in.) (71550000) ■ Stroke 17.20mm (0.677 in.) 37 2. Do not forget to clean the filters regularly to remove INDUCTION SILENCER ■ PracticalR.P.M. 4,000-45,000 r.p.m. dirt and lint that accumulate on the filter screens. (72414000) ■ Output 2.8 ps / 2.76 hp / 33,000 r.p.m. Also, clean the carburetor itself occasionally. ■ Induction Silencer Filter (3pcs.) Weight 340g (11.99 oz.) 6-15 3-Chome Imagawa Higashisumiyoshi-ku (72414100) Osaka 546-0003, Japan TEL. (06)6702-0225 http://www.os-engines.co.jp FAX. (06)6704-2722 ON-ROAD FILTER OIL (20ml) 21 (72414200) Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. 60092970 011402