Right, got my heads back. Put them back on, fired her up and sweet. noticed a small leak at front of carby (because some fool decided to paint his manifold). I took the carb off (Carter thermo quad) replaced the leaky gasket, put the carb back on, turned her over and nothing. Theres spark, theres gas but it wont fire at all...What have I done wrong???
your needle and seat is jammed. So fuels just flooding your engine. Free it up then put the carb back together. You'll probably have to remove all the plugs now, clean them, turn the engine over with no plugs, throw the plugs back in and then it should fire.
Sorry Brenx but I dont even know what the needle and seat are???. While your here, Do i really need the crappy tin moulded thingy between intake and block??? and, Stupid question maybe but is it possible to mix the heads up, could they be put on the wrong side???
The needle and seat will be immediately after the fuel inlet on the carb. It's know as a bird bath well thats what I know it as. Nope you don't need it. When you run a bird bath you need to run paper thinkness gaskets. Thick felpros or the likes won't work. There will be vac leaks from the manifold.
The heads are identical so it doesn't matter wher eyou put them
Ok, Ive had a play but still no good. I need more info on the needles seats etc. Im guessing the floats control the needles which in turn stop fuel flow into the carb?????????? Both needles are connected by that thingy, but that thingy is not sliding up and down very well at all. Talk to me like Im a dumbass and I should understand what ever info I can get.Cheers.
is it the same carby that was on the motor whe it was running? if so has anyone been playing with it while it was off?
(Both needles are connected by that thingy, but that thingy is not sliding up and down very well at all.) connected by what thingy?
and how can you see this?
the needle and seat are at the very end of the fuel line where it goes into the carby, when the fuel enters the carb the float rises(it floats in the petrol) and when it reaches the correct height the tab on the float pushes against the end of the needle and stops the fuel from coming into the carb till the fuel level drops again (assuming the float is set at the correct level)
Ok, Carbies in three main bits. Top, middle main plastic bit and bottom.Floats and Fuel in is fine and stopping as it should. The needles are connected across the top of carb just behind the choke flaps, (by the thingy). The thingy lifts the needles opening the seats to feed the jets. The thingy is lifted by a small cam on the accel main shaft. when you accelerate the cam turns lifting thingy etc etc. There is a spring between the cam and thingy pushing thingy up and holding the seats open, But nothing at all to close them. Am I missing a spring on top to force it shut again or is it vacum closed or what.? As I have never disassembled it I cant work out why the needles are held open. All its doing is floadiing everything with a hell of a lot of gas.
It was all working fine when I took the took motor apart to recon heads. I left the carb on the manifold but I got bored waiting for them to get done so I took the carb off and painted the manifold. Replaced carb and have encountered this problem. Im guessing Ive knocked something off or dropped something out whille taking the carb off cause Im a rough barstard.
ok the "thingy" I think you are talking about sounds like it might be the acceleretor pump (this moves up/down when you push the accelerator pedal and squirts a jet of fuel into your motor so you get immediate acceleration) if you pump it lots you will get heaps of fuel everywhere, not good.
does it flood when you try to start the motor without pumping the accelerator? if so it sounds like your needle and seat are stuffed (these bits aren't the ones you are talking about, you cant see the needle and seat from outside the carb) to check the needle and seat carefully undo the nut thingy where the fuel line goes into your carby, this should be a brass fitting, be careful because the needle may fall out, what sort of carb is it by the way?
Read the thread.Carter thermo quad. Carbs in bits. Seats are in bottom of bird bath feeding primary throats. Needles are lying in front of me on table. They open just fine but wont close again. What am I missing???
I found an exploded diagram of a similar carter model carb atwww.carberatorfactory.com and it looks like there is supposed to be a spring on top of the (thingy) sliding arm connecting both needles. So I have a messy garage floor to clean and search. Gonna be like looking for a spring in a spring stack.
Hmmm Ross79xe Thermo-Quad is a tricky carb to work on. I've never been game.
I'm all for getting in and having a go yourself (how else do you learn) but if you do not have a manual about the carb it will be very difficult for anyone to explain much on the net.
From the post so far, as Brendan says, you sound as though you have some crud holding the needle off the seat in the fuel inlet causing flooding
The needle and seat are not visable. You have to take the top part of the carb off to access them.
I would strongly advise you not pull the carb apart. It is difficult to get back together and may require adjustments, the spec's for which you do not have.
The "needles" you are looking at, I suspect are the metering rods. These are controlled by the throttle and engine vacuum. They have nothing to do with the needle and seat.
Sorry I'm not being any help. If it doesn't run when you get it back together, I'm sure a mobile motor mechanic would get you running for under $100
I do have an XD Shop manual in front of me Ross79xe. The section on thermo quads is 20 pages!
I'm guessing the reduction in vacuum then the cam on the throttle control closing ie the reverse of how they open. that and a bit of gravity.
If I can gleen any more from my thick book I'll let you know. But it will be tomorrow at the earliest, I gotta get some sleep!
Good luck with it!!
Good Shite. It cant be gravity though cause theres a spring between the cam and thingy(metering rods connecting arm) pushing them open. I guess this spring is to smooth out the mechanisim when you accelerate but am not sure.Thanks Work horse
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