Nitro Engine Tuning Guide Part 2 - The Idle Speed Screw

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Nitro Engine tuning is probably the most asked question on my Channel, people struggling with their tuning and asking tuning related questions. In this 4 part series, I look at Tuning and adjusting the High Speed Needle, the Low Speed Needle, and the Idle speed screw. Please check out the other three parts of this series and gain a better understanding of how to tune your nitro engine!

[dylanjoy]

I'm only 15 and I want to be a mechanic when I'm older so my dad brought me a nitro car to work on and it's been very helpful thank you for this really good tutorial now my engine is running perfectly

[Absolutecorn]

Easily the most helpful youtuber in this hobby. Your videos turned me into a tuning god! Now I've mastered tuning nitros and its just a fun little process instead of a headache :) gotta love this hobby, easily the most fun and educational ones out there!

[troysterismtroysterism]

Hi mate. I'm slowly getting back into rc nitro cars after a 6 or so year break. Previously I've had nitro buggies, on road cars, truggies, monster trucks and boats. Just want to say THANK YOU. Your posts are with out a doubt the most helpful and explanatory. So "G day mate" from down under Australia.

[Trail_Shreder]

Bro the gap on mine was almost half open, i have not ridin my pride for years unfortunitily so im giving it a little check, i thank myself for clicking on this video! Keep up the hard work on that content🤘

[GSGExtreme]

Greetings from US - Great video! This helped me a lot!

[dimijames]

I have a question for you.

The most confusing thing I find about tuning the lsn is that there are 3 variations or variables you have to deal with.

These 3 options are:

1. Adjusting the idle speed screw
2. Adjusting the lsn
3. Adjusting the throttle trim on the transmitter.

What I find challenging is trying to understand when to use any of those three settings. First of all, in your video you adjust the idle speed screw to either speed up or slow down the rate of the engine however the same changes occur if you lean out the low speed needle (you get engine spin from starving it of fuel) or perhaps trimming the throttle on the transmitter. How do you know when to trim what? For example I have seen many tuning tutorial videos where they talk about adjusting the low speed needle and as they turn the lsn clockwise and leaning the motor the wheels begin to spin. They then proceed to mention that you may need to adjust your idle speed screw to stop wheel spin...but couldnt that mean your engine is running lean and now youre starving it off fuel and air.
Can you please shed some light or anyone on these comments? Hope I have made some sense.

Best regards
Dimitri




First off, ensuring that the car is idling well you can adjust the idle speed screw (as shown in this video)

[polcat]

I wish this dude could tune my nitro engine. I've never been able to get my head round it.

[free]

Thanks.
When you said "by screwing in you are increasing the gap" don't you mean that by screwing in you are decreasing the gap as when you screw something in you are closing the gap?
Also is it the fuel flow you are trying to control and not the air flow?

So just to be clear, when you are screwing IN by turning the screw clockwise you are closing the gap preventing less fuel in and NOT less air? It is the fuel intake that u are trying to control and not air? Does that sound right? Also does more fuel (not air) going in cause a higher rpm?

[hjelm]

What starter are you using on this car?? i want to get an easy and reliable starter that is easyly to connect like on your video/ Anders

[amiralikhan]

Hi I have few questions
1.My car was running fine but all of the sudden it slow down like has nearly no power even after giving full throtle it just drive very slow. Smoke and sound of the engine comes as normal.
2. Why I need lot of strokes to start engine.
3. Why engine throwing alot of fuel.
4. Why engine switch of when turn electric power on.
I will be waiting for answer

[madaxman]

What is the brass screw below the high speed needle?

[idowow]

I have looked for that so much thanks you

Btw I have connected to battery opposite and smoke came out I switched controller and receiver and all the lights work correctly but when I give gas or try to turn it doesnt do anything how can I fix it ?

[andrewbounds]

My car got a spring on my carb is that the same and how long should my tank last on idle it is a 75 ml can you help me

[c]

Just got one and mine idles good for about 5 secs and slowly speeds up to about half throttle even when my remote isn’t in my hands. Any help?

[joeywebb]

i just got a new carb where should i start the idel right now it revs to top speed how many turns out to start with

[fakasap]

Bought a brand new tmaxx 3.3 recently. Tried to do the break in process but when It idles it moves forward right away. I adjust the needle but still moves forward a lot. Any tips?

[nicholasstonham]

J you need to Come n tune mine I'm having real difficulty for starters my throttle seems to be sticking n keeping throttle open slightly

[jonathanroy]

can you make a video of how to replace those gears that your saying are very expensive lol I have them bc I have another parts rc car that's exactly the same as my current one but not sure how to get them out!

[jaan]

What factory setting for 18cc force engine

[DYLLY]

That car sounds beautiful! I know I’ve asked you many questions in the past and I’m probably getting on your nerves but is it the exhaust that makes it sound like that or is it just the engine?