how to tune carb

[billyca412751]

I have a D&A 4wd with a "GO.18" engine. Its just in the break in period. I havnt touched the settings what so ever on the carb but when I'm running the car gently it works fine but if I try and open the throttle quickly, the engine just quits. Anyone know what the problem is and how to fix it?

 

[ohmygahitscoby]

You're running to lean. Richen up your high speed needle (Counter-clockwise.).

 

[8ight]

This could happen running too lean or too rich. What temps do you have?

 

[ohmygahitscoby]

Isn't it if its to rich it'll bog down and die? If its lean it'll suddenly die.

 

[itsalifeworthliving]

lean is in, rich is out.

hey bill, the best investment is to get a temp gun from your local hobby shop, they start at about $25. that is the heart of tuning your engine! with out it you will go in circles. the engine needs to be tuned quite often as temp and humidity change.. it will run any wher from 220*-260* 270+ is over heating and could couse damage very quickly.. before you make any changes.. right down on a peace of paper what the carb settings are and put them in your pit box. you will always refer to that when in doubt(you do not have manuel). as far as tuning. the high speed needle is the large one on top of the carb and the low speed nedle is the small screw on the side of the carb throat. the one towards the bottom is idle screw.DONT TOUCH IT! start with the low speed nedle and do a couple throttle punches, keeping an eye on the blue smoke..and keep checking the temp.. when you get that set pretty good wich it probly is know, continue to the high speed needle. by the sound of it, your gona want to richen up a little bit. so just twist the high speed out in 1/16 increments and a few high speed tests. again keeping an eye on the temp. what i do is find a sweet number that you like. mine is 220*230*.. its a cool setting with plenty of power..and tune it to that number. the low speed needle should be pretty good once its set. you will mainly be adjusting the high speed.

 

[Mattyfats420]

wow nice post itsalifeworthliving. great feedback. i know for my nitro when i first got it i read the manual and it had a spot in there for normal operating temps. mine is 250*. but its defferent for every engine i would think. what i do when i take my car out for a spin is go easy with it for about 3-5 min so it gets up to temp, than you can tune from there. its impossible to get the tune right on and engine that isnt warmed up. something i didnt know till i got in the forum. also the last thing you want to do if start messing with the tuning in big turns of .5 or more (something i learned the hard way ) lol start with about 1/16-1/8 like itsalife said and you should be alright. chances are you are running to lean. from what I've learned in here is that when you break in you would want to run your car rich to lube up all the engine parts. you might want to wait till the vets in here chime in but i would think about breaking it in again at a richer setting as to make sure that you have propperly lubed your engine. if I'm wrong I'm sorry and someone will surely correct me. consult your owners manual on correct break in for your car. then you can start leaning it out to get the performance

 

[david41990]

You're running to lean buying a temp gun can really help

 

[Parputt537]

Get a temp gauge and follow this guide: http://www.nitroreview.com/hintstips/ParisRacingEngineTuningTechTips.pdf

Once I realized I had been tuning my LSN way to rich I was able to get a great tune with a much richer HSN. Best guide I have found.