User manual OS ENGINES MAX-21VZ-R

[. . . ] 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. q 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. q q 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. [. . . ] 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. BATTERY INTEGRATED GLOWPLUG HEATER Commercialy available handy glowplug heater in which the glowplug battery and battery leads are integrated. STARTER BOX For starting the engine. FUEL PUMP For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout, is required. REMINDER! Model engine fuel is poisonous. 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. 9 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. · The Metering Needle: For adjusting the mixture strength at part-throttle and idling speeds, to obtain steady idling and smooth acceleration to mid speeds. · The Throttle Stop Screw: For setting the minimum idling speed: Needle Valve SILICONE FUEL LINE Heatproof silicone tubing of approx. is required for the connection between the fuel tank and engine. Metering Needle CARBURETOR CONTROLS Four adjustable controls are provided on this carburettor. The Needle-Valve: For adjusting the mixture strength when the throttle is fully open. The Mixture Control Screw: For changing the feeling at mid speads and acceleration. (Do not rotate the screw more chan one turn. ) Throttle Stop Screw Mixture Control Valve Assembly Screw · · NOTE: Readjustment may be necessary, occasionally to allow for changes in fuel formula gear ratio or clutch engagement point. 10 STARTING THE ENGINE & RUNNING-IN ('Breaking-in') For long life and high performance, every engine needs to be 'run-in' or 'broken-in'. With care, runningin of the MAX-21VZ-R can be carried out with it installed in the vehicle. Be sure to install the aircleaner on the carburetor and to use a mufflerpressurized fuel system. The following procedure is suitable for these engines when the O. S. T-2040 tuned silencer and a fuel containing up to 30% nitromethane are used. · Now connect glowplug battery lead to heat the plug filament and start the engine. Needle Valve Close 0. 3~0. 5mm · Use the same fuel as is to be employed for all initial running and containing NOT LESS THAN 18% lubricant. Open · Temporarily position. Attention: It is vitally important to set the throttle at the correct position before starting the engine. If the engine is allowed to run with the throttle too far open under ''no load'' conditions (i. e. with the driving wheels not in contact with the ground) it will rapidly over-heat and may be seriously damaged. remove the glowplug to check that it glows bright red when energized. · Open the Needle-Valve 3 turns from the fully closed · Switch on the transmitter and receiver and set the · DO NOT energize glowplug, but apply electric starter to draw fuel to carburetor. throttle very slightly opened from the idling position (see sketch, top right). 11 · 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 smoke from the exhaust. Needle 30° The position of the needle-valve when starting the engine. 30 ° 30° Close the needle-valve approx. 30° after running the vehicle for one full tank of fuel. Repeat this procedure several times. · Next, disconnect the glowplug battery and try running the car on the track. If the engine stalls, open the throttle fractionally, but try to keep the engine running as rich as possible: if it stops because of being excessively over-rich, close the Needle-Valve 30° and try again. been consumed, then close the Needle-Valve 30° and run the car for another full tank of fuel. 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 idling mixture is too rich. In this case, turn the Metering Needle clockwise 45~90°. If, on the other hand, the engine tends to speed up momentarily and then cut out abruptly when the throttle is opened, the idling mixture is too lean. [. . . ] It is also recommended that a good in-line filter be installed between the tank and carburetor. Do not forget to clean the filters regularly to remove dirt and lint that accumulate on the filter screens. Also, clean the carburetor itself occasionally. At the end of each operating session, drain out any fuel that may remain in the fuel tank. [. . . ]