O.S. engine MAX-21TM Instruction Manual
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O.S. engine MAX-21TM Instruction Manual

W/ t-maxx or revo mainfold
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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.
It is suggested that any instructions supplied with
the vehicle, radio control equipment, etc., are
accessible for checking at the same time.
CONTENTS
2 5
6
7
8
8-10
10
ENGINE EXPLODED VIEW & PARTS LIST
11
12
13-16
1
17-19
20-22
22
23-24
25
26-29
30-33
34-37
38
39-40

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Summary of Contents for O.S. engine MAX-21TM

  • Page 1: Table Of Contents

    CONTENTS SAFETY INSTRUCTIONS AND 17-19 STARTING THE ENGINE & RUNNING-IN WARNINGS ABOUT YOUR O.S. ENGINE 20-22 FINAL ADJUSTMENT ENGINE CONSTRUCTION CARBURETOR CLEANLINESS NOTES WHEN APPLYING AN ELECTRIC...

  • Page 2: Safety Instructions And Warnings About Your O.s. Engine

    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.
  • Page 3 NOTES • This engine is intended for model cars. • The wearing of safety glasses is also Do not attempt to use it for any other strongly recommended. purpose. • Take care that the glowplug clip or • Mount the engine in your model battery leads do not come into contact securely, following the manufacturers' with rotating parts.

  • Page 4: Engine Construction

    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 Crankshaft achieve perfect...

  • Page 5: About The Engine

    ABOUT THE ENGINE BEFORE STARTING These engines are designed especially to power Tools, accessories, etc.The following items are the T-Maxx or Revo. Purposely designed LC3 necessary for operating the engine. glow plug is supplied with the engine for Items necessary for starting improved power, fuel economy and durability.

  • Page 6: Basic Engine Parts

    TOOLS BASIC ENGINE PARTS HEX SCREWDRIVER Necessary for engine installation. Heatsink Head 1.5mm, 2mm, 2.5mm, 3mm Carburetor SCREWDRIVER Type 11K Necessary for carburetor adjustments. No.1, No.2, etc Exhaust LONG SOCKET WRENCH WITH PLUG GRIP Recommended easy removal replacement of the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip.

  • Page 7: Facts About Glowplug

    FACTS ABOUT GLOWPLUGS Since the compatibility of glowplug and fuel may have However, plug life can be extended and engine a marked effect on performance and reliability, it may performance maintained by careful use, i.e.: be worthwhile to choose the R/C type plug found Install a plug suitable for the engine.
  • Page 8 T-Maxx Revo Install the electric starter taken from the original engine. Install the manifold supplied with the engine. T-Maxx Revo Adjust the plastic ball end so that the throttle linkage may be connected correctly. Adjust the stopper end so that the throttle linkage may be made correctly.

  • Page 9: Starting The Engine & Running-In

    For long life and high performance, every Fill the tank completely with fuel. engine needs to be 'run-in' or 'broken-in'. With care, running-in of the MAX-21TM can be Temporarily remove the glowplug to check carried out with the engine installed in the that it glows bright red when energized.
  • Page 10 The carburetor on this engine has been set at Next, disconnect the glowplug battery and try the starting setting when the engine leaves the running the car on the track. If the engine factory. stalls, open the throttle fractionally, but try to keep the engine running as rich as possible: if Switch on the transmitter, and check that all the it stops because of being excessively over-...

  • Page 11: Final Adjustment

    FINAL ADJUSTMENT Final adjustment should be carried out only after Run the vehicle (with throttle fully open) over the running-in has been completed. the longest available straight course, in order to observe the model's speed. Next return Type 11K the car to the starting point, close the Needle- Valve 30˚...

  • Page 12: Carburetor Cleanliness

    Finally, beyond the nominal break-in period, Carburetor Body Ball Link a slight readjustment toward a leaner needle setting may be required to maintain Rotate the Metering Needle until its slotted head is flush with the maximum performance. ball link body. This is the standard position.

  • Page 13: Checking The Engine

    5. Finally, when cleaning the exterior of the Dirt and dust may lodge in marked places. engine, use only methanol. Do not use gasoline, kerosene or any solvent that might damage the silicone fuel tubing. Caution: The rear crankshaft bearing of this engine uses a special plastic retainer.

  • Page 14: Trouble Shooting

    TROUBLE SHOOTING Symptom Engine fails to fire. Corrective action Cause Fuel tank is empty. Fill the tank with fuel and repeat Fuel not reaching the engine. Priming procedure. Glowplug element is burnt out. Replace glowplug. Glowplug battery discharged Recharge or replace the battery. Clean or replace fuel filter.
  • Page 15 Symptom Unstable idle Corrective action Cause Unsuitable glowplug Use suggested glowplug in the instructions. Do not use extremely high nitro or low oil content fuel. Unsuitable fuel Extremely light flywheel Add heavier flywheel. Silencer is disconnected or has play Install silencer securely. Symptom Not reaching expected peak r.p.m.

  • Page 18: Carburetor Exploded View

    11K CARBURETOR EXPLODED VIEW S.M3x3 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw 11K CARBURETOR PARTS LIST Code No. Description 21982700 Mixture Control Valve Assembly 27881820 "O" Ring (L) (2pcs.) 22781800 "O" Ring (S) (2pcs.) 21285901 Needle Valve Assembly 27881820...
  • Page 19 11K-R CARBURETOR EXPLODED VIEW S.M3x3 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw 11K-R CARBURETOR PARTS LIST Description Code No. 21982700 Mixture Control Valve Assembly 27881820 "O" Ring (L) (2pcs.) 22781800 "O" Ring (S) (2pcs.) 21285901 Needle Valve Assembly 27881820...

  • Page 20: Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES RACING ENGINE PARTS O.S. Glow Plug Exhaust Seal Ring Manifold Spring (2pcs.) (2pcs.) (72106172) (21427200) (71653000) Long Socket Wrench Dust Cap Set With Plug Grip (73300305) (71521000) For Carburetor Nipple 7 (73300712) For Silencer 12 (73301212) For Carburetor The specifications are subject to alteration for improvement without notice.
  • Page 21 21TM (Revo) THREE VIEW DRAWING Displacement 3.41cc (0.208 cu.in.) Bore 17.0mm (0.669 in.) Stroke 15.0mm (0.590 in.) Practical R.P.M. 3,000-35,000 r.p.m. Power output 1.8 ps / 29,000 r.p.m. 4- 3.3 Weight 243g (8.57 oz.) M7x1 JAPAN JAPAN 26.3 34.8 18.8 25.4 Dimensions (mm) 6-15 3-Chome Imagawa Higashisumiyoshi-ku...

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