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18

CARBURETOR ADJUSTMENT – AT THE TRACK

You can only fine-tune the main needle setting at the track. Initially, the main needle should still be set a little rich. Fill the fuel 
tank, run the car up to maximum speed for a few laps, and check if it reaches top RPM without running rich towards the end 
(4-stroking). Lean the main needle by small increments (1/12 of a turn, like 1 hour on a clock) and run the car again. Repeat 
these small adjustments until the engine accelerates well and reaches maximum speed without running rich. It is advised to 
then richen the main needle 1/8 of a turn (counter-clockwise).

Running the engine too lean will cause the engine to overheat, resulting in excessive engine wear and possibly breakdown. 
A fast, simple way to check the engine temperature is to apply a few drops of water to the cylinder head. The drops should 
evaporate only after 3-5 seconds. If they evaporate immediately the engine is too hot; richen the main needle 1/8 of a turn 
(counter-clockwise). Check engine temperature regularly and often.

The idle RPM and low-speed needle settings may require a little fine tuning after the main needle has been set properly. Once 
properly adjusted, the engine should produce a strong, high-pitched sound at maximum speed, and a thin trail of smoke 
should be visible from the exhaust tailpipe.

For more information about setting the idle and low-speed needle settings, see section Carburetor Adjustment – Before 
Putting the Car on the Track.

NOTE:

 The carburetor settings may change with changes in weather conditions, fuel, glowplug, or exhaust system. After 

changing any of these, always richen the main needle (counter-clockwise) ¼ to ½-turn and then re-adjust the main needle 
again on the track.

Summary of Contents for NT18 0.8cc

Page 1: ......

Page 2: ...on your purchase of the high performance NT18 0 8cc nitro powered engine Developed for highest performance and excellent reliability this engine represents the perfect combination of manufacturing qu...

Page 3: ...oper use of the machine can be very dangerous You alone are responsible for operating your engine safely act with discretion and pay special attention at all times Carefully read and fully understand...

Page 4: ...lly This graphic means compulsory GRAPHIC INDICATIONS The following words and graphic indications are used throughout this manuals Be sure you fully understand these meanings before reading the text I...

Page 5: ...uel glowplug and air filter that you will use in the operation of this nitro powered engine PARTS AND EQUIPMENT Air Filter Fuel Inlet Main Needle Valve Idle Speed Screw Flywheel Clutch Bell Crankshaft...

Page 6: ...parts in hot soapy water and rinse thoroughly with clean water Dry the parts with a clean towel or compressed air use safety eyewear Oil the foam element with proper air filter oil Exhaust System We r...

Page 7: ...d to ignite the glowplug for starting We recommending using a high quality battery operated glowplug starter from a reputable manufacturer Glowplug Wrench A glowplug wrench is required for removing in...

Page 8: ...urfaces of the engine mounts blocks are flat This is important to avoid any distortion of the crankcase and to optimize heat dissipation through the chassis Hint To flatten the bottom part of the moun...

Page 9: ...uch as a basement or a garage Model engines like automobiles emit poisonous exhaust fumes during operation Only operate the engines outdoors where there is good ventilation Make certain the glowplug c...

Page 10: ...e exhaust tailpipe and dry start the engine for 2 seconds This will build up extra pressure in the pipe and in the pressure line to the fuel tank causing the fuel to be pushed to the carburetor Apply...

Page 11: ...venting the piston from moving upward If this happens DO NOT try to start the engine or severe engine damage may result 1 Remove the glowplug open the throttle fully cover the glowplug hole with a clo...

Page 12: ...ough experience in avoiding possible dangers Never touch any part of the engine while it is running or immediately after the engine has stopped Some portions of model engines become considerably hot d...

Page 13: ...position This primes the fuel lines and allows the fuel to reach the engine 3 Apply the glowplug starter and start the engine with a starter We strongly recommend using the 104300 HUDY Micro Start Box...

Page 14: ...set at the factory meaning that the original settings are close to where they should be for normal operation The engine carburetor has 3 adjustments Main needle valve Low speed needle Idle adjustment...

Page 15: ...the factory setting Turn the needle CW until it barely stops do not tighten it further or you will damage the carburetor Turn the needle CCW by 3 4 turns from the fully closed position 2 Low speed Nee...

Page 16: ...nly a turn each way The low end needle of each individual engine is precisely adjusted at the factory The low end needle adjusts the performance of the engine between idle up to approximately throttle...

Page 17: ...ituation If the engine will not idle at all rich the low speed needle counter clockwise or turn the idle adjustment screw clockwise to increase the idle RPM NOTE Because adjusting the low speed needle...

Page 18: ...ngine temperature is to apply a few drops of water to the cylinder head The drops should evaporate only after 3 5 seconds If they evaporate immediately the engine is too hot richen the main needle 1 8...

Page 19: ...idity decreases slightly richer increases slightly leaner Barometric pressure decreases leaner increases richer Altitude lower richer higher leaner Fuel nitro content lower leaner higher richer ENGINE...

Page 20: ...arometric pressure and altitude cannot always be accounted for by the factory default settings These symptoms may occur when air density is very low such as in high mountains or extremely cold tempera...

Page 21: ...The use of after run oil is also important during periods of prolonged storage such as winter Remove the engine from the model Liberally apply oil into the carburetor and glowplug hole Wrap your engin...

Page 22: ...buse improper operation improper mounting improper adjustment or lack of or improper maintenance will not be covered by this warranty Any use of the product for other than its specific intended use wi...

Page 23: ...f the engine thoroughly before you open it work on a clean spot use proper tools Any dust or dirt that enters the engine will make considerable damage All moving parts inside the engine are subject to...

Page 24: ...NGS CARBURETOR RETAINER 611201 REAR COVER GASKET 611401 CRANKSHAFT 611601 BLUE HEATSINK HEAD CNC MACHINED HEAD SHIM 612001 PISTON SLEEVE SET CONNECTING ROD SET 616001 CARBURETOR 681001 XRAY NT18 MUFFL...

Page 25: ...612001 681801 616001 388820 388840 960025 681901 611601 611201 681001 611001 908275 611001 611401 NT18 ENGINE PARTS 25...

Page 26: ...1 50 TREN N SLOVAKIA EUROPE P O BOX 103 911 50 TREN N SLOVAKIA EUROPE PHONE 421 905 402724 PHONE 421 905 402724 support teamxray com support teamxray com XRAY MODEL RACING CARS P O BOX 103 911 50 TREN...

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