Need help!

[Zethien]

Ok i'm the noobish Nitro guy so work with me a lil bit. I'm in the military stationed in korea and decided to get me a nitro car. I went out and got a Kyosho and everything's cool with it until here in the last week or so. I put a 2 speed tranny in it, and got a tuned pipe. I also changed out the clutch and got a better one put in, my problems started when I was messin with the valve on the engine itself. Of course you know there are 2 valves. I assume one is a gas valve, and the other controls how far the barrel stays open in the motor. I have this problem now with high RPMs making it where I can't make the tires stop spinning. It won't idle at all. I closed both valves as far as they would go and tried to tune it one day for hours to just get an idle out of it but I have nothing. Now it doesn't even want to start and idle at the high RPMs anymore it just cuts out. When you gas it full throttle as soon as the RPMs come back down it instantly dies kinda like a real car that is gettin flooded. I'm baffled here guys, my lil mechanin at the Hobby shop is on the Kyosho team so he's out of country for a few months. Any help at all would be much appreciated.

Here's a pic if it will help. When it was running I got it up to 68 MPH in second gear...

 

[Rolex]

Welcome to the best R/C around. You'll get any info you'll ever need here.
Okay, there are 3 adjustments on the carburetor. The LSN or Low Speed Needle, the HSN, or High Speed Needle, and the idle setting screw. Look in your manual and make note of which is the idle and which is the LSN. The HSN is the big one that's inside a tube. Since it's already spinning its' wheels, turn down the idle screw even before you try to start the engine. Looking down the throat of the carb, with the filter off, you should see an opening between 1 and 2mm. Set it to that, then follow this procedure.

Put the nose of the truck against something firm so it can't get away from you. If you have an EZ start, keep it running while moving your LSN one way or the other till it starts to run.
Adjust your LSN and idle screw till it idles well and will run up to half throttle. (get it to running temp before you finalize any settings) When it idles properly, throttle it to half and see if it stalls or bogs down. If it stalls, it's too lean. If it bogs, it's too rich.
Now go to full throttle. This is when you adjust your HSN. Same thing. If it bogs, it's too rich, stalls, it's too lean.
When it seems to be running good, pinch the fuel line. It should speed up slightly and then stall within 3 - 4 seconds. If it stops quickly, your LSN is too lean. If it takes longer, the LSN is too rich.
Drive it for a while and then take a temp check to make sure it's at the proper temp. If it's too hot, richen the HSN.
You will have to make small adjustments on the HSN almost daily to compensate for outside temperature and humidity.

By the way, the factory settings are for break in, or a starting point if you really messed things up. Once an engine is broken in, don't expect it to run right by going to those settings.

 

[Zethien]

I only know of the two adjustments, the idle setting screw, and the one that is right on the valve the gas line comes in. I have to assume that that is the LSN. I closed the LSN all the way, screwing it in as far as it would go. That made it where it was getting no gas at all, wouldn't start. Then I started slowly turning it open a few clicks at a time until it would turn over like 8-10 times then die. Then the more I turned it the longer it would run, but still only for a few seconds. I can either get it to barely do that, or just have it running wide open. It's like there is no in between with this thing, if it's gonna stay on it's only if I have the settings up so high that it's turning like 50 billion rpms. That's causing it to get really really hot, and it smells like somethin is burning really bad. Not like the fuel burning, but something else. I'm really stumped on this. And I have had the idle setting about 1mm open the whole time, I never messed with that. I just don't know, like I said it's either wide open or it won't run. Sometimes it will even run a few seconds then just suddenly shut off. And just to see what happens I tried pinching the fuel line going into the carb, instant shut off. No change it idle speed at all, it just dies instantly. Of couse that is at a very high idle though, I can't even put it on the ground because it's idling so high i'm afraid i'll burn my clutch up by putting it against something.

 

[Zethien]

I've been lookin on the web and figured out that my carb doesn't have a LSN, only HSN and a idle screw. So I got really pissed and took my carb apart and put it back together, redid my throttle linkage, and tried that out. It will idle now with the HSN turned about 1 1/4 turns open. So i'm playin with that. Once it gets warmed up it doesn't want to just idle and sit there though it nudges forward a bit so I have to turn my HSN back down a bit but I think I have it figured out for the moment...

 

[FRIDGE]

you say youve gotten a new exhaust make sure it has a gasket between the header and the engine and that it is tight against the engine. did you every crash the car? i remember when i crashed my car like the inside barrel thing in the carb shifted and i couldnt mess with my idle and it used to go all crazy.

 

[Zethien]

Yea

That crash thing might be somethin. I've never really hit anything hard with my car but when I took the barrel out of the carb and put it back together it seemed to do a lil bit better. And it was doing this pre new muffler. I got the new muffler thinking it would help

 

[FRIDGE]

mufflers do help. do you have the car on or off the ground the whole time? if the wheels spin sloowly off the ground put it on the ground against a wall if you dont get half of your tires shaved off. the best way to learn wiht nitros is personal experience. youve gotto keep on trying. I'm sure that it will work out for you.

 

[Zethien]

Yea it's doin better now I can put it on the ground and it doesn't take off across the parkin lot like it used to. Now it just kinda sits there and creeps forward every few seconds.

 

[FRIDGE]

the your set if you want to get rid of that minor push try cutting your idle down a tiny turn.

 

[olds97_lss]

Any idea what engine it is? It would help us to know the car and engine to help you out in the future. That way, for those of us who don't recognise this particular vehicle, we can search it up and look at the carb or engine explosion at the mfr's web site, if available.

It sounds like your doing ok now though. Just back the idle off a touch.

 

[Zethien]

Yea all I can tell you is it's a discontinued Kyosho Taisan Pluse Porshe 911 Turbo. It's a .12 engine, and good luck finding ANYTHING on it because I can't find crap but a parts list on the main Kyosho page. I kinda picked a bad car to start with i think =P