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Engine Tuning for normal use
Engine Tuning Terms
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There are a few common terms used around the world to aid in your tuning
?. This is the needle normally located at the side of: Idle Speed Needle or Throttle Stop Screw This adjusts the carburettor slide. the carburettor
to increase or decrease the idle speed. Keep 1mm opening gap when the throttle is in the close position,
2. This is the needle enclosed in a brass sleeve on the top of your carburettor that controls: Fuel Supply Needle or Top End Needle, High Speed
This needle increases the. your high speed fuel to air mixture by turning out anti-Rich(clockwise and is referred to as (.
Lean(Turning the needle in clockwise reduces the fuel to air mixture and is referred to as (.
3. This needle controls your take off speed and is generally a large brass screw located at the back of: Low Speed Needle or Bottom End Needle
Turn the needle out anti. If your engine is a three needle type then the bottom end needle is located on the end of the slide. the carburettor-
Turning the. clockwise and the engine will become rich and have less bottom end speed needle clockwise and this will lean out the bottom end
and give a faster take off.
Idle Speed Needle
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Important Things To Know Before Running In Your Engine
?. Do not use. Only use high quality fuel from your local hobby supplier. Nitromethane and Oil, Methanol. components3 Model car fuel is made
25?nitro or more than ?5? fuel with less than Do not use. you may have to add another head shim25? If you use higher than . nitro a fuel
with Oil is suspended in the fuel as a lubricant for your engine and also aids. oil?2? less than cooling.
2. Lean(Overheating is generally caused by lack of airflow to the engine or . Overheating the engine will damage the engine and shorten its life(
carburettor adjustments.
3. If you start your engine without the receiver and transmitter on or batteries are low or have failed the engine may rev out of control and this will
piston and sleeve, bearings, destroy the conrod.
Running In Your Engine
?. Take. Turn on your receiver and transmitter with fully charged batteries off your air filter and look inside the carburettor and make sure the
If not adjust the throttle stop screw or check the throttle trim on your. mm?gap between the slide and the body of the carburettor is about
Relace and secure the air filter. transmitter.
2. This can be done by removing and blowing into the pressure fuel line that is attached to the muffler. Prime the fuel line with fuel.
3. Connect a fully charged glow warmer to the glow plug and start. degrees Celsius?0 Pre Heat the cooling head with a hair dryer to about
the engine for the first time.
4. While the engine is running. tanks of fuel thru the engine before attempting to drive the model3 It is recommended that you idle at least
RICH(This means the engine is running . there must be a consistent amount of white smoke and oil coming from the exhaust system(.
If not turn out the bottom end needle anti-to get a) Idle Speed Screw(It may be necessary to increase or decrease the . clockwise
If the engine becomes hot to touch stop immediately and start again when it has cooled down. consistent idle.
5. With the wheels off the ground give your engine a little rev. After the initial tanks of fuel you can start leaning out the engine a bit at a time to
The engine under. of a turn?/8 the Low Speed Needle ) LEAN(If the engine cuts or keeps making a spluttering sound turn in . clear out spent oil
If not the engine is too lean and will overheat. all conditions must blow smoke.
6. Place the car on the track with body on and run around for about two tanks. The engine should still be spitting out excess oil and not be running
Turn the Bottom End. Celsius??0 over of a turn and repeat this process until the engine is responsive but still chugs a little?/8 needle another
and spits oil.
?. of a turn and with?/8 Turn in the top end needle. It is now time to adjust the Top End Needle
The. until you have a reasonable top speed
It is still important to see a. adjust them until you have a satisfactory balance between the two
To test if the engine is. of a turn?/8 end needle
immediately it is too lean.
Trouble Shooting
There are a number of reasons the engine won'The engine generally starts immediately when the correct. t start Prolonged pulling of the pull. conditions are met
starter or starter box will only fill the crank case causing hydro lock and cause dame to the pull starter or engine.
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The filament coil must glow brightly. Check this by connecting the warmer to a new plug outside the engine. The Glow warmer is not charged
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Remove the plug and if the filament coil is distorted or not a shiny silver replace it. The plug is damaged
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Clean with methylated spirits and back was. Fuel filter or tank filter blocked
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Replace with correct fuel and make sure the fuel line is primed. Incorrect or polluted old fuel
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of a turn?/8 Turn out the bottom end needle . Engine bottom end is set too lean
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This will result in a damaged engine. Engine is too hot
?. The engine piston and sleeve have been damaged due to heat or dust entering the engine. No compression. Test the compression by turning the engine over by
If not replace the conrod piston and liner. When the piston is at the top of its stroke you should feel it get tight. hand.
Maintenance
?. fuel line and crank case must be, After you have run your engine for the day all fuel in the tank Model car fuel attracts water and this will cause corrosion. removed
With the fuel tank. and damage the bearings Remove the plug and use squirt some after run or light oil into the. empty start the engine and run the fuel lines dry crank
Replace the plug and cover the exhaust out let. Turn over the engine a few times to coat the bearings. case.
2. Carefully remove the air filter not allowing dirt inside the engine as this will damage the piston and Replace the filter element if necessary. liner.
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Clean the engine of dirt and fuel
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Tips
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To get back to the original factory setting or your preferred setting for a particular fuel mix you should do the following
?. Before making any adjustments to the engine take your tuning screw driver and turn in your bottom needle clockwise gently until you feel it can go any further.
)If you have lost your base settings. Repeat this with the top end needle. turns to the original position3 Record this in you note pad and back off .) turns3 Example
turns from the bottom and the Low Speed Needle flush with the carburettor body2?5 start with the top end needle out .
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If it evaporates quickly your engine is too hot. Check engine temperature regularly by wetting your finger with spit and placing it on the cooling head
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Stay on the safe side with engine settings a bit rich is always better for prolonged life
Top End Needle
( Main Needle)
bottom end needle and top end needle have an effect on each other and it will be necessary to
cm from the carburettor and if the engine cuts2running too lean pinch the fuel line quickly about
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Idle Speed Needle
Low Speed Needle
( Second Needle)
Keep 1mm gap
Repeat this process. the body on run the model
If not turn out the top. smoke trail at high speed
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