Please help, truck will not lean out???

[Nitro nitwit]

First off, thanks in advance for any help. Fairly new to RCing but I'm pretty handy and have learned a ton of the basics. Anyhow, the issue;

It won't lean out! It will idle fine but as soon as I give her throttle she dies. It will move around and function at low speeds but any more and she dies. I have ALOT of fuel and smoke so i know I'm super rich but no matter how far i go in with either HS or LS needle it still spits out unburnt fuel and smoke. Manual says never to go more than 2.5 turns in on the high speed but I've got quite a bit further and still super rich?!?!? I've gone in two full turns on the LS and everything in between. Same result. If i go in two far on either it wont run obviously, but i go as far in as i can before it dies and STILL rich?

Any help would be great. Thanks

Forgot to add, savage x rtr 4.6 stock...ish

 

[Nitro Nerd]

From a Nitro Nerd to a Nitro Nitwit....;-) Prior to it stalling, does it hesitate at all, or just shut off? I've had this issue a few times..

1. Try running with your glow ignitor in (or better yet try a new plug)
2. Is your fuel good? Even if it's new it can be bad (happened to me once).
3. How many tanks (or gallons) does the engine/vehicle have on it? Are you seeing fuel anywhere it should not be (by the pipe on the truck-side, on the manifold, near the tank, etc?
4. Has it ever run good before and just started happening, or did you just finish break in an starting to tune it? If the former, what were the last changes you made to the truck prior to it happening?
5. Are you letting the engine wake up prior to leaning it out?
6. Are you able to take temps? If so, what are they ~?


No need to seal your engine just yet. ;-) Most likely something ancillary causing it

 

[Gaije165]

By the sounds of the carburetor is bad try to get a new one

 

[Nitro Nerd]

By the sounds of the carburetor is bad try to get a new one

Good point, or perhaps clean the one you have first to see if it's just gummed up. ;-) Recommend ruling out fuel, plug, fuel intake system, before doing too much. One of the times it happened to me it turned out my (new) fuel lines were too small in diameter. Damnest thing....I only figured it out because I basically reversed all the crap I did prior to it happening. That's when I learned to take little 'test runs' during a rebuild--when possibl- so as to reduce variables.

 

[Cornholio]

5. Are you letting the engine wake up prior to leaning it out?

No need to seal your engine just yet. ;-) Most likely something ancillary causing it

This. You can't properly tune your engine until you're up to an acceptable temperature. From what you're describing with all the excess fuel spitting out, you're running way to rich. Set your needles back to factory setting and then heat up the engine to at least 200 degrees with a heat gun before you start driving it.

 

[Nitro nitwit]

I bashed fir a while a couple weeks, broke a spur gear and while I waited fir the new one i put on a tuned pipe and new fuel lines. I tore it all down and put it back together. I've had it running for quite a while before i start to tune, like an hour on and off..

 

[savage24x]

Richen the LSN lean the HSN.

 

[Nitro nitwit]

Nitro nerd
1. Glow is good and bright
2. No idea if fuel is good, how would I know?
3. I bought it used but it ran great a couple weeks ago. Lots of fuel where the new pipe splits and everywhere around it...
4. See above
5. See above
6. Temp gun has no battery lol, I'm a remedy that..

Thanks guys

---------- Post added at 6:03 PM ---------- Previous post was at 6:02 PM ----------

Thx savage 24 x, but i think I've "exhausted" all possible needle configurations..

---------- Post added at 6:11 PM ---------- Previous post was at 6:03 PM ----------

If there was fairly substantial air leakage from the exhaust at both the manifold and the spot where it splits, would it cause this? Cuz i dont like the way it fits on there...

 

[SMaxxin]

The easiest thing to try first is a new glow plug, I know you said it glows bright but I would replace it just to eliminate it...If it doesn't help you haven't lost anything

 

[Nitro nitwit]

Thx maxxin, I've used several known working plugs.

 

[SMaxxin]

How many turns clockwise can you turn your HS needle before it bottoms out? Same question for the LS needle....Don't put too much pressure when it bottoms out or you can damage o rings or even the needle, when it gets snug stop.

 

[Nitro nitwit]

From flush, approx 2 on the LS and 5.5 on the HS.

---------- Post added at 6:50 PM ---------- Previous post was at 6:47 PM ----------

I should note that according to the "pinch test" the low speed was set properly.

 

[SMaxxin]

Pull the needles and make sure the tips are not broken, if they are good there is no reason that engine won't get lean as you close them. You have to turn them clockwise to lean it....Just in case.

 

[Nitro nitwit]

Haha, yeah thanks for the vote of confidence Smaxxin.. Anyway just pulled HSN and LSN they are both fine. O-rings in fine condition as well... Like i said, I' m fairly competent with tinkering and mechanics in general, but this one has me truly puzzled.

 

[SMaxxin]

Haha, yeah thanks for the vote of confidence Smaxxin.

Sorry man didn't mean any disrespect but sometimes you just never know. This one is tricky, I have heard of always running lean but not always running rich. The only thing I can think of is that one needle is rich and the other is too lean.

 

[Nitro nitwit]

No worries man, no offence taken. You're just tryin to help and i appreciate that. A real head scratcher for sure. I guess ill just keep tinkering until i figure it out... I will prevail!

 

[Nitro Nerd]

It will idle fine but as soon as I give her throttle she dies.
Nitro nerd
1. Glow is good and bright
2. No idea if fuel is good, how would I know?

The problem is NOT that you are unable to lean it out, but that you are unable drive it without it stalling, correct? Just want to make sure we focus on specifics.

Regarding #1, did you try what originally I asked? Drive it with the ignitor on.
Regarding #2, you either can test it in another vehicle or try new fuel.

Try new fuel and get back with the results. That is my advice at this point. ;-) I recommend against cracking open your engine/carb before ruling this stuff out but that is up to you.

 

[Nitro nitwit]

Ok guys, it would appear i just really suck at tuning. I bought a second one, (exact same) for parts but decided to get it going. Anyway, they both run exactly the same, so clearly i just stink at tuning. They both spit out lots of exhaust and unburnt fuel. They both idle and run fine but die on medium to heavy throttle. Any tips on tuning these SOB's? Btw i also bought new fuel so unless I'm really unlucky it shouldn't be that. If anyone has tips specific to this rc that would be great, in the meantime i will search the forums... Thx guys.

 

[Cornholio]

I'd have to agree, you stink at tuning. Try reading the Tuning flow chart here:

https://www.rcnitrotalk.com/forum/showthread.php?t=60832

 

[hotrodrob]

Keep leaning out the hsn a bit at a time untill it goes away, just keep a smoke trail and an eye on temps