I'm very new to this...need help.

[ImageFX]

I've wanted one of these cars for awhile. Well, I finally got one by HPI. It's displayed in the "Introduce yourself" section. https://www.rcnitrotalk.com/forum/showthread.php?t=40158

Anyways, I got it today, charged up the ignitor and what not...followed the directions on letting the car run throw some gas to break it in. Well, I've let it sit thru 4 tanks of gas. So I attempted to run it. Well, it runs for under a minute and I try to drive it slow, as instructed. But my issue is that under minute, even 30 seconds, it just kills over on me. So I attempt to start it again, and change the throttle settings, but it will still just die when I give it alittle gas. Sometimes I can give it alittle gas and it will run slightly, but it's very touchy...and will just shut off. I've been trying to do some reading but am still coming up short. Can anyone throw me a few tips please? Or do I just need to break it in more? Right now, I feel like a :loser:

Much thanks in advance!

 

[Monkey Wrench]

Nah, I'm betting it gurgles a lot when you try to give it throttle, right? If that's the case, you need to lean it out by turning the high speed needle clockwise about 1/8 to 1/4 turn. Try that and see if it works. If you haven't done so, buy yourself a temp. gun. During break-in, you want that engine to get into the 215 to 220 range to properly seat the piston to the sleeve. Also, make sure you add a few drops of after-run oil and put the piston at bottom dead center when you're storing it.

Good luck!

 

[ImageFX]

I will try that. Thanks! Any other thoughts?

 

[Monkey Wrench]

Maybe, can you describe what it's doing in a bit more detail? Are you seeing raw fuel coming out the pipe? Does it bog and gurgle before it dies or just flame out? Have you changed the glow plug? When you say, "changed the throttle settings", what exactly did you change?

There are a number of potential causes, so the more detail you can provide as to what it is doing, the more likely it is to pin down possible solutions for ya!

 

[sweetdiesel]

If it just dies when you give it gas, lean out the LSN in 1/8 turn increments (turn it clockwise). Once you can get it going full speed start to lean out the HSN for max power, making sure there is a good trail of smoke at all times. Once the HSN is set you will have to readjust your LSN needle slightly to compensate for leaning out the HSN.

 

[ImageFX]

Maybe, can you describe what it's doing in a bit more detail? Are you seeing raw fuel coming out the pipe? Does it bog and gurgle before it dies or just flame out? Have you changed the glow plug? When you say, "changed the throttle settings", what exactly did you change?

There are a number of potential causes, so the more detail you can provide as to what it is doing, the more likely it is to pin down possible solutions for ya!

Yeah, if I turn the car on it's exhaust side, raw fuel will come out. Yes, it does kind of a jerk (bog) while trying to run it. I just bought it today and did buy an extra glow plug. Would i really need to change it? I changed the throttle settings on the transmitter. It has a dial that idles the car or gives it a pull when to turn it.

If it just dies when you give it gas, lean out the LSN in 1/8 turn increments (turn it clockwise). Once you can get it going full speed start to lean out the HSN for max power, making sure there is a good trail of smoke at all times. Once the HSN is set you will have to readjust your LSN needle slightly to compensate for leaning out the HSN.

Great, now I'm going to have to google for "lean out" and find the acronym for LSN and HSN!!! I can only assume this may have to do with the same needle as talked about in an earlier post. So some smoke is a good thing, right?? I'm also not sure of the location of this needle. But as far as from reading and looking at the engine, it's almost directly under the carberator and will require a flat head screw driver.

 

[Monkey Wrench]

Take a look at your manual to familiarize yourself with the components on your engine. LSN = low speed needle, HSN = high speed needle. Typically, HPI sets them at the factory to run very rich to insure your engine gets plenty of lubricant as you break it in. Running rich means allowing a lot of fuel into the engine. Running lean means the opposite. The thing to remember is, the leaner you run it, the hotter it gets. There's a fine line there, but if you run it too rich, it will not break in properly and it will not run as you intend it to.

It is not uncommon to foul a plug or two during break-in, but since you say it does start, I doubt the plug is fouled. I would try what Sweetdiesel advises, turn the low speed needle a tick or two clock wise.

 

[ImageFX]

Before I started asking these questions, I read the manual a lot. I'm a computer guy, I like building things and knowing how stuff works. But the manual wasn't very helpful. It pointed out a few things, but didn't exactly throw in details. Like on the transmitter, there are 2 settings, TH: nor and rev and ST: nor and rev. It says for both to be set to rev. And leaves me thinking, thanks, but why? What's wrong with "nor"? What does "rev" do. The manual just tells me what to do with no reason why. Kinda like parents. hehe

As for the LSN and HSN. Are there 2?? I only have one as far as i can tell. The one directly below the carberator. I turned it 1/4 clockwise. I can't test it now because it's past 11pm here. Don't want to bother the neighbors. Tomorrow I will let you know the effects.

 

[sweetdiesel]

Those two settings on your TX are for the servos, nor =normal and rev=reverse. TH=throttle/brake and ST=steering. If you pull the trigger and the carb opens you are fine. Same with the wheel, if you turn the wheel left and the wheels on the car turn left you are fine. If they react the opposite, then turn the servo setting to the opposite setting.

The screw on the carb body right next to the arm on the carb is the LSN. The screw that sits in the barrel on top of your fuel inlet nipple is the HSN. There shuld be an additional screw on the carb sitting somehwere in the front that does not sit in a housing and that is your idle adjustment screw.

 

[olds97_lss]

"Nor" is "normal" servo operation. How it works by default. "Rev" is the opposite of normal, it forces the servo to work backwards of default.

Different vehicles have different servo placement which requires a radio that has the ability to "swap" polarity of a servo electronically instead of mechanically.

Lie a few others have said, try turning your HSN and LSN 1/4 turn clockwise. This will lean out the fuel/air ratio. The LSN (low speed needle) affects how the engine reacts from no throttle to about 1/4 throttle. The HSN (high speed needle) affects total fuel flow to the engine and is the only tuning for the rest of the throttle movement range (1/4 throttle to wide open throttle [WOT])

 

[sweetdiesel]

See page 2 of this manual for a diagram of where your HSN, LSN, and idle adjustment screw is.

http://www.hpiracing.com/graphics/instr/15101/I-15101-2 S.pdf

 

[ImageFX]

I've been trying to figure these things out almost all day. And I've learned more in the last 10mins than in the last 8hrs! I appreciate the help

 

[mnimud]

I had the same problem with my Savage, following the instructions to the letter didn't help. It was as many suggested, just a matter of leaning it out. I had to alot more then the factory manual suggested. I also had to adjust the lsn slightly to get the hsn right to get enough speed out of it to shift. If you get it running well but it never shifts look to leaning out the lsn. I was leaning the hsn so much due to the lsn being too rich which caused the stalling as you described. Also, definitely watch these videos:

http://www.savagebeast.150m.com/id20.htm