RaceANissan616

I have been trying to start my engine for some time now and now that I think I'm pretty close, I cannot operate my carburetor by ways of the throttle servo/bell. The bell moves, but it does not open or close the carb a lot, and it seems as if my low speed needle is sinking back into the carb??? please any help would be very much appreciated

RaceANissan616

bump, come on guys please!

rmdhawaii

iTrader: (4)

Have you already tried adjusting the throttle end points on your transmitter?

What car, radio and engine are you using???

RaceANissan616

Well, elec. isn't an issue right now, all I'm doing is playing with the bell on the end of the carb and the slide isn't opening correctly...Hpi Nitro Rs4 3 18ss, Nitro Star 18ss small block, futaba radio and elec.

Rapid Roy

I beleive that you have a rotary carb not a slide carb. It this is true, then try tightening the screw that attaches the arm to the carb.

matts6887

Well some more info is definately needed here it seems. As someone else already pointed out, we need to know the engine and type of vehicle at least in order to help out. Also, by "bell" are u referring to the slide part of the carb itself, or something else?

matts6887

Also, if u have a computer radio as it seems quite a few peep these days so, try re-adjusting the endpoints for the throttle/brake servo using the radio's instructions.

RaceANissan616

sorry I probably didn't provide enough details, it is a rotary carb, I used the wrong word, not the slide, the opening where the air goes into the carb...I have an analog futaba radio and I do NOT have an issue with electronics, and what exactly do I tighten, and if it's by the LSN I have tried to tighten it but it either makes the carb impossible to open or it doesn't move...The bell I am referring to is the one that is at the end of the carb by the LSN which has the ball cup that connects to the throttle servo and such. thanks

Rapid Roy

From what you are describing, you pull the arm on the carb while looking down into the carb neck and you don't see the carb opening up. If this is what is happening, the arm thats connected to your carb needs to be tightened. This is NOT the idle adjust screw or either of the screws to adjust the fuel mixture.

RaceANissan616

Yes, but the only way to tighten the "bell" to move the carb opening is to tighten the nut around the LSN, not the LSN, but there is a nut around it that tightens this bell towards the carb...if this is tightened however, the carb becomes immobile, I can't find a happy medium :sad:...And the carb kinda moves a little bit but then it stops, I don't really know how to explain it better than that...sorry, help would be appreciated

Rapid Roy

Did you take apart the carb? Either the "arm" (not bell) is getting pinched against the carb body or the "rotor" assembly that is supposed to turn inside of the carb is stuck or jambed.

RaceANissan616

No i didn't really touch it, apart from taking the nut off from the 'arm' haha...i don't know what all those parts are inside, and there is a nut at the other end of the carb, I didn't know what it was at the time but I'm getting worried taht it was the middle speed needle??

And there's my carb...i don't know if you can tell what I'm talking about or not, but I hope that helps... thanks

Taylorm

-there shouldn't be a middle speed needle. there should be a nut that holds the carb. lever tight to the "barrel" that rotates inside the carb. body. if this nut is loose the servo will move the "lever" but not the barrel. tighten this nut and put a little loctite blue on it and you should be good. lookk at item 1 in this os exploded view..yours should be similar....... http://www.osengines.com/parts/ev11620aa.pdf

RaceANissan616

haha I think I have all the terms down now, I tightened the nut yesterday, but when I did that I couldn't move the arm at all, in effect not moving the barrel of the carb...Also I had noticed that my LSN has moved further into the carb when I was messing around with that nut, does this have anything to do with the odd barrel movements? (sticking, clicking, not moving at all)

Taylorm

-maybe the barrel is sticking in the carb body. i have an old os that i dug out and the barrel was sticking in the body. gummed up with fuel/oil. you may want to take the carb completely apart, clean thoroughly and start over.