O.S. Engine MAX-21VZ-R Owner's Instruction Manual

Manual is about: Engine MAX-21VZ-R

Summary of MAX-21VZ-R

  • Page 1

    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 familia...

  • Page 2: Warnings

    2 remember that your engine is not a "toy", but a highly efficient internal- combustion 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 fu...

  • Page 3: Warnings

    Warnings model engine fuel is poi- sonous. 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 a...

  • Page 4: Notes

    This engine is intended for model cars. 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. Install an effective silencer (muffler). Frequent close exposure to a noisy exhaust (e...

  • Page 5: Notes

    Notes to stop the engine, fully retard the throttle stick and trim lever on the trans-mitter, or, in an emergency, cut off the fuel supply by pinching the fuel delivery line from the tank. • warning! Immediately after a glowplug- ignition engine has been run and is still warm, conditions sometimes e...

  • Page 6: Basic Engine Parts

    Basic engine parts with this engine, the piston will feel tight at the top of its stroke when the engine is cold. This is normal. The piston and cylinder are designed to achieve a perfect running clearance when they reach their normal running temperatures. Heatsink head carburetor type 20k crankshaf...

  • Page 7: Engine Installation

    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 ste...

  • Page 8: Glowplug

    Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability, it may be worthwhile to choose the r/c type plug found most suitable after tests. Recommended o.S. Plugs are p7. Carefully install plug finger-tight, before final tightening with the correct size pl...

  • Page 9: Tools, Accessories, Etc.

    Tools, accessories, etc. 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 necess...

  • Page 10: Carburetor Controls

    Long socket wrench recommended for easy removal and replacement of the angled and recessed glowplug, the o.S.Long socket wrench incorporates a special grip. Silicone fuel line heatproof silicone tubing of approx. 5mm o.D. And 2mm i.D. Is required for the connection between the fuel tank and engine. ...

  • Page 11: •

    • • • 0.3 ~ 0.5mm use the same fuel as is to be employed for all initial running and containing not less than 18% lubricant. Starting the engine & running-in ('breaking-in') open close needle valve the following procedure is suitable for these engines when the o.S. T-2040 tuned silencer and a fuel c...

  • Page 12: •

    When the engine starts, first allow it to operate in short runs at the very rich starting settings, with the glowplug battery still connected and the driving wheels clear of the ground. The rich mixture will, under these conditions, provide adequate lubrication and cooling, indicated by profuse smok...

  • Page 13: Final Adjustment

    If the engine fails to start check the following: glowplug battery discharged or glowplug defunct. Fuel not reaching carburetor. ◆ ◆ ◆ engine flooded. Do not over- prime. (this could also cause hydraulic lock and damage the engine on application of the electric starter.) remove glowplug, close needl...

  • Page 14

    Warning! Mixture adjustments (whether via the metering needle, or the needle-valve) cannot be made accurately under 'no-load' conditions, which, in any case, are not advised, since such operation carries the risk of seriously damaging the engine through over-revving and overheating. ◆ ◆ with the opt...

  • Page 15: Carburetor Cleanliness

    Mixture control valve carburetor body first rotate the mixture control valve until its slotted head is flush with the carburetor body. This is the standard position. Carburetor cleanliness the correct functioning of the carburetor depends on its small fuel orifices remaining clear. (see care and mai...

  • Page 16: Care and Maintenance

    Warning! Do not attempt to turn the engine with the starter if the engine is over-primed (flooded) with fuel. To do so is likely to seriously damage the engine. Care and maintenance 1. 2. 3. The minute particles of foreign matter, that are present in any fuel may, by accumulating and partially obstr...

  • Page 17: Guarantee

    Guarantee this engine is constructed from the very best materials available and to the very highest engineering standards, using the most advanced precision machinery. However, the extremely high stresses imposed by car racing operation under very severe conditions, stresses which are exacerbated by...

  • Page 18: Engine Exploded View

    Engine exploded view type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw ✽ 4 3 2 c.M2.6x7 q - 0 9 8 6 5 4 1 1 -1 1 -2 7 = w e r c.M3x16 c.M2.6x18 18.

  • Page 19: Engine Parts List

    Engine parts list the specifications are subject to alteration for improvement without notice. Screw set gasket set crankshaft crankshaft ball bearing (rear) exhaust seal ring crankcase crankshaft ball bearing (front) carburetor retainer assembly carburetor complete (type 20k) connecting rod piston ...

  • Page 20

    The specifications are subject to alteration for improvement without notice. Type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw ✽ carburetor exploded view & parts list 5 4 3 2 1 9 7 6 8 1 -1 1 -2 2 -1 2 -2 s.M3x3 2 -3 2 -4 6 -1 carburetor...

  • Page 21: Racing Engine Parts

    Racing engine parts t-2030 tuned silencer super joint tube 21 crankshaft clamp 1521 long socket wrench with plug grip o.S. Genuine parts & accessories dust cap set glowplug p7 ■ (72106030) ■ (72106300) ■ ■ (71530200) (71521000) ■ 3 (73300305) 8 (73300812) 16 (73301612) 18 (73301812) ■ (72106040) • (...

  • Page 22: Three View Drawing

    ■ displacement ■ bore ■ stroke ■ practical r.P.M. ■ power output ■ weight specifications three view drawing japan 20k 21 37 4- φ 3.3 30.8 45 83.7 29.6 43.9 21 27.5 15.3 99 unf / -28 1 4 49.6 3.46 cc(0.211cu.In.) 16.6 mm(0.654in.) 16.0 mm(0.630in.) 3,000-42,000 r.P.M. 2.5 bhp / 34,000 r.P.M. 315.5g(1...

  • Page 23

    C copyright 2001 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. 120100 tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan u n eq ua ll ed qua lity precision & per for m an ce es ta blis hing the standards of e xce ll en ce url...