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. Keep these instructions in a safe place so that you may readily refer to them whenever necessary.
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.
ABOUT THE WARRANTY NOTE As delivered, the engine has the carburetor lightly fit into its intake. Secure it changing its angle according to the car chassis. Since this is a special factory tuned engine, special parts are available for only limited time, say, one year after discontinuing the production. Also, the engine is free of warranty due to damage and/or wear occurred during running. 8 ABOUT THE ENGINE The O.S. SPEED 12XZspec is a high performance engine meeting IFMAR specification produced by O.S.
TOOLS, ACCESSORIES, etc. The following items are necessary for operating the engine. Items necessary for starting FUEL Generally, it is suggested that the user selects a fuel that is commercially available for model two-stroke engines and contains 10-30% nitromethane. As a starting point, we recommend a fuel containing 20% nitromethane, changing to a fuel containing more nitro if necessary.
BASIC ENGINE PARTS Outer Head Exhaust Cover Plate Carburetor Type 12F(B) Mounting Lugs Crankshaft Crankcase Crankshaft Ball Bearing (Front) 12 INSTALLATION OF THE STANDARD ACCESSORIES INSTALLATION OF THE DUST CAP SET Installing the glow plug. Insert RP6 plug supplied into heatsink-head carefully, making sure that it is not cross-threaded before tightening firmly. Glowplug (All the O.S. T-Type plugs including the RP6 are not supplied with a washer.
GLOWPLUG Glowplug life Since the compatibility of the glowplug and fuel may have a marked effect on performance and reliability, it is suggested to use the O.S. RP6 plug when it is necessary to replace. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. Particularly in the case of very high performance engines, glowplugs must be regarded as expendable items. However, plug life can be extended and engine performance maintained by careful use, i.e.
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.
STARTING THE ENGINE & RUNNING-IN ('Breaking-in) RUNNING-IN ('Breaking-in) While Operating Running- in is a procedure for an engine to come close to actual running conditions (fuel, r.p.m., engine temperature, etc.). Please do not run on a public street, this could cause serious accidents, personal injuries and/or propetry damage. Excessively rich running and prolonged low speed running should be avoided.
Set the throttle opening a little wider that the factory setting by adjusting the Throttle Stop Screw. Switch on the transmitter and make sure that each linkage moves correctly. Turn the engine with starter box to draw fuel into the engine. approx 1mm Deliver fuel into the carburetor. Fuel Fuel tank side Now connect glowplug battery lead to heat the plug filament and start the engine.
How to stop the engine 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. The position of the needle-valve when starting the engine. Needle Close the needle-valve approx. 15˚ after running the vehicle for 3 to 5 full tanks of fuel. Repeat this procedure until approx. 2 liters of fuel have been consumed. Note: In the event of any major working parts (e.g.
Warning! With the engine running, close the throttle and allow it to 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, it is probable that the idle mixture is too rich.
CARE AND MAINTENANCE 1. 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.
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.
No. Code No. 33 Description Outer Head Inner Head Head Gasket Set (2pcs.) Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.) Connecting Rod Built-Up Parts Set (No.4.5.6.7) Carburetor Complete (Type 12F(B)) Carburetor Retainer Assembly Crankshaft Ball Bearing (Front) Crankcase Crankshaft Ball Bearing (Rear) Crankshaft Cover Gasket Cover Plate Glow Plug RP6 Exhaust Seal Ring (2pcs.) Dust Cap Set ( 3mm 1pc,16mm 2pcs.
CARBURETOR EXPLODED VIEW 2-1 3-1 2 3 3-1 2-2 4-1 1-1 1-2 1 4 7 6 7-1 5 8 9 10 11 9-1 Type of screw S.M3x3 S...Set Screw 34 CARBURETOR PARTS LIST No. Code No. 1 1-1 1-2 2 2-1 2-2 3 3-1 4 4-1 5 6 7 7-1 8 9 9-1 10 11 21982700 27881820 22781800 21681900 27881820 21881950 71533255 22615000 21982620 22781800 21682100 21682200 21682500 22781800 21982520 23818430 26381501 21982900 22615000 Description Mixture Control Valve Assembly "O" Ring (L) (2pcs.) "O" Ring (S) (2pcs.
O.S. GENUINE PARTS & ACCESSORIES O.S. Glow Plug Silencer Complete Set T-1060 Description Code No. RP6 (71642060) 72107400 Silencer Complete Set T-1060 L52 T-1060 L52 Tuned Silencer Assembly 72107410 Silencer Ring (12) Set 72107420 (W/Ring 2pcs./Silencer C Spring 1pc.) Silencer C Spring (12) (3pcs.) 72107430 Adapter Seal Ring (2pcs.) 22826140 Exhaust Manifold Assembly M1004 72107460 Exhaust Manifold Spring (2pcs.) 72106172 Adapter Seal Ring (2pcs.
THREE VIEW DRAWING Dimensions (mm) SPECIFICATIONS 2.1 cc (0.128 cu.in.) 13.8 mm (0.543 in.) 14.0 mm (0.551 in.) 5,000-44,000 r.p.m. 1.75 ps / 35,000 r.p.m. 220g (7.76 oz.) 31.4 ■ Displacement ■ Bore ■ Stroke ■ Practical R.P.M. ■ Power output ■ Weight 4- 3.3 70.6 11 1 UNF1/4-28 25.4 39 29.5 34.9 15.1 38 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., Ltd. All rights reserved. Printed in Japan.
