Expressly for 1/8 off-road buggy racing competitions It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-5 of this booklet and to strictly adhere to the advice contained therein. Also, please study the entire contents of this instruction manual, so as to familiarize yourself with the controls and other features of the engine.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE Remember that your engine is not a "toy", but a highly efficient internalcombustion machine whose power is capable of harming you, or others, if it is misused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. If at some future date, your O.S. engine is acquired by another person, we would respectfully request that these instructions are also passed on to its new owner.
! NOTES • This engine is intended for model cars. Do not attempt to use it for any other purpose. • The wearing of safety glasses is also strongly recommended. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. • Take care that the glowplug clip or battery leads do not come into contact with rotating parts. Also check that the linkage to the throttle arm is secure. • Install an effective silencer (muffler).
Near TDC ENGINE CONSTRUCTION With this engine, the piston will feel tight at the top of its stroke Piston (TDC) when the engine is cold. Cylinder Liner This is normal. The cylinder bore has a slight taper. The piston and cylinder are designed to achieve clearance a perfect when Crankshaft running they Slight taper reach operating temperature. When the engine is cold. 6 NOTES WHEN APPLYING AN ELECTRIC STARTER Do not over-prime.
NOTES ON OPERATION While Operating GUARANTEE Please do not run on a public street, this could cause serious accidents, personal injuries and/or propetry damage. This engine is constructed from the very best materials available and to the very highest engineering standards, using the most advanced precision machinery.
BEFORE STARTING Tools, accessories, etc.The following items are necessary for operating the engine. Optional Extras T-2060SC WN TUNED SILENCER COMPLETE SET This is a set of T-2060SC Tuned Silencer and M2000SC Exhaust Header Pipe Assembly. GLOW PLUG T-Type (Turbo Plug) P3 is supplied with the engine. As replacement, suggested O.S. plugs are P3, P4 and P5. SUPER JOINT TUBE 21 This is to use with joint tube connection type silencer.
! Model engine fuel is also highly flammable. Keep it away from open flame, excessive heat, sources of sparks, or anything else which might ignite it. Do not smoke or allow anyone else to smoke, near to it. FUEL PUMP For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout, is required. FUEL FILTER To installed in the fuel line between fuel tank and carburetor to prevent foreign matter from entering the carburetor. SILICONE FUEL LINE Heatproof silicone tubing of approx.
CARBURETOR CONTROLS 21J2 Four adjustable controls are provided on this carburetor. The Needle-Valve(Adjusted at the factory): For adjusting the mixture strength when the throttle is fully open. Carburetor Reducer Needle Valve The Mixture Control Valve: For changing the mixture strength at mid speed and acceleration. (Do not rotate the screw more chan one turn.
INSTALLATION OF THE STANDARD ACCESSORIES Installing the glow plug. Insert P3 plug supplied into heatsink-head carefully, making sure that it is not cross-threaded before tightening firmly. (All the O.S. T-Type plugs including the P3 are not supplied with a washer.) Install the exhaust seal ring supplied.
ENGINE INSTALLATION Make sure that the vehicle's engine mounting surfaces are level and in the same plane. Poor installation may cause distortion of the crankcase, bearings, etc., resulting in erratic running and loss of performance. The recommended screws for securing the engine are 3mm or 4-40 steel Allen hexagon socket type.
The carburetor is set as shown below at the factory. Start the engine as it is. The needle-valve is set approx. 3 and 1/4 turns opened from the fully closed position. The following procedure is suitable for this engine when the O.S. T-2060WN tuned silencer and a fuel containing 30% nitromethane are used. Turn the needle-valve clockwise until it stops. This is the fully closed position. Do not force it to turn further. Close Fill the tank completely with fuel.
When the engine starts, warm it up by repeatedly increasing the rpm to medium speed and back again to a fast idle with the mixture set very rich, the glowplug connected, and the driving wheels clear of the ground. The rich mixture will provide adequate lubrrication and cooling indicated by profuse exhaust smoke. If the engine is allowed to run with the throttle too far open under ''no load'' conditions (i.e.
FINAL ADJUSTMENT Final adjustment should be carried out only after the running-in has been completed. Run the vehicle (with throttle fully open) over the longest available straight course, in order to observe the model's speed. Next return the car to the starting point, close the NeedleValve 15˚ and repeat the run, taking note of the improvement in performance.
Finally, beyond the nominal break-in period, a slight readjustment toward a leaner needle setting may be required to maintain maximum performance. Carburetor Body Ball Link Rotate the Metering Needle until its slotted head is extruded by 2.5 turns the ball link body. This is the standard position. CARBURETOR CLEANLINESS The correct functioning of the carburetor depends on its small fuel orifices remaining clear.
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. Dirt and dust may lodge in marked places. 28 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.
TROUBLE SHOOTING Symptom Engine fails to fire. Corrective action Cause Fuel tank is empty. Fuel not reaching the engine. Fill the tank with fuel and repeat Priming procedure. Glowplug element is burnt out. Glowplug battery discharged Replace glowplug. Recharge or replace the battery. Clogged fuel filter Air cleaner and silencer inside is dirty. Clean or replace fuel filter. Replace cleaner element and clean inside silencer. Over priming Remove glowplug and pump out excess fuel.
Symptom Unstable idle Corrective action Cause Unsuitable glowplug Use suggested glowplug in the instructions. Unsuitable fuel Do not use extremely high nitro or low oil content fuel. Extremely light flywheel Add heavier flywheel. Silencer is disconnected or has play Install silencer securely. Symptom Not reaching expected peak r.p.m. Corrective action Cause Insufficient warming up or running-in. Set the needle only after warming up. Complete running-in.
35 1 2 3 4 5 6 7 8 9 10 10-1 11 12 13 14 15 16 Description Outer Head Inner Head Head Gasket (0.2mm) Head Gasket (0.1mm) Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.) Connecting Rod Carburetor Complete (Type 21J2) Carburetor Retainer Assembly "O" Ring (2pcs.
CARBURETOR EXPLODED VIEW 1 1-1 S.M3x3 6 6-1 2 5 7 5-1 7-1 3-1 8-1 4 3 10 10-1 11 Type of screw 8 9-2 9-1 9 12 S...Set Screw 36 CARBURETOR PARTS LIST No. 1 1-1 2 3 3-1 4 5 5-1 6 6-1 7 7-1 8 8-1 9 9-1 9-2 10 10-1 11 12 Code No. 23781400 26381501 23981520 22082340 27881820 22848210 71533272 22615000 23618197 46066319 22082940 22082950 22848160 27881820 22082600 46066319 22781800 22848130 23781110 29015019 23818190 Description Ball Link No.
O.S. GENUINE PARTS & ACCESSORIES GLOWPLUG P3 (71641300) P4 (71641400) P5 (71641500) M2000SC EXHAUST HEADER PIPE ASSEMBLY T-2060SC WN TUNED SILENCER ASSEMBLY (72106440) (72106130) Header Pipe Spring (2pcs.) Exhaust Seal Ring (2pcs.) (72101272) (22826140) Joint Spring (3pcs.) Exhaust Seal Ring (2pcs.
THREE VIEW DRAWING SPECIFICATIONS 3.49cc (0.21 cu.in.) 16.27mm (0.64 in.) 16.8mm (0.66 in.) 4,000-40,000 r.p.m. 2.55 ps / 2.59 hp / 33,000 r.p.m. 362 g (12.77 oz.) 37 ■ Displacement ■ Bore ■ Stroke ■ Practical R.P.M. ■ Power output ■ Weight 4- 3.3 86.3 21 15.6 28.5 UNF1/4-28 31.6 45 29.5 44 20.5 Dimensions (mm) 40 URL : http://www.os-engines.co.jp 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 C Copyright 2010 by O.S.Engines Mfg. Co.
