Stalling and limited speed

Don't quite understand your problem-check the choke plate adjustment/carb linkages

The secondary throttle is not opening and it could be stuck/seized or the vacuum (if equipped) is leaking.

With engine off, turn throttle fully opened and try moving the secondary throttle to see if it moves freely.

sorry.. it's confusing, is it.
even i'm confused. let me try to draw it.
nothing is stuck. but the top butterfly is not opening.

uhmm.. this is how i see it.
the main throttle is playing properly. and at some 70-80% throttle the secondary opens.. but that other butterfly on top of the secondary doesn't. its got a free moving lever outside the carburetor but i don't see anything that it is attached to it.
is that normal? that it's always closed like that?

sorry for this. I'm new at cars and hoping to know more so i can troubleshoot car problems myself.
so far, what i know about cars came from "Auto repair for dummies"

sorry.. above image is wrong...

The top butterfly is the choke. If it is manual where you use a cable to engage, check the cable and adjustment. It should be open at all times, unless the choke cable is pulled.

If it is automatic, which is not likely to be unless the carb has been replaced with one of a later version, check if it is electrical or thermally opearted.

So could it be the reason for limited speed and air burst?

Yes, the engine would be running too rich with insufficient air getting into the engine and this would cause backfiring intermittently. The spark plugs would be sooty black under such conditions.

this helps me a lot.
there's nothing connected to it. so should i just try to clamp it open or something?
uh. wait. is it still called a backfire when the air bursts come out from the air cleaner not the muffler?

Exhaust is known as misfiring.

Coming out of the air cleaner is called backfire.

Can you show mw a picture of the carb choke? You can use something to hold it open but the idling speed at cold start would be low and it could possibly result in difficult starting and stalling, unless the idling speed is set high, maybe at 1000 rpm.

ohhh... that's easier to understand :D thanks.

I used a nut temporarily to hold it open... ill find something to hold it permanently. no problems in the starting and no stalling but there are backfires...

uhm.. ill post a picture tomorrow. i left my car at my grandparents house. :D

For backfiring, it could be due to the rich condition, ignition timing too advanced, a poor cylinder, spark plug and/or related components. That would require tests to confirm.

spark plugs are new.
what does ignition timing mean?
after letting the choke butterfly open. the backfiring reduced. but is still there.
here are the pictures

ooopppsss
pictures...
here ..
sorry there's nothing much to see..
it was night time when i took these

Ignition timing means the time the spark plugs fires. It is adjusted by turning the distributor clockwise or counterclockwise and you use a timing light to check. If contact breaker points are used, the gap clearance would affect the timing. The wider the gap, the more advanced it is.

I don't see any choke plate in the pictures.

The rubber capped plunger at bottom of last picture is the accelerating pmp. Ensure you have a fine spray into the carb at top inner part of carb barrel. If there are none or is too little, you would have hesitation and possibly backfiring as well.

when i press the pump it sprays fine. but the secondary doesn't spray any.
sorry its the picture, you cant see the plate because it's too dark. notice the second barrel is dark while the first one, you can see the butterfly(gold). the secondary is closed.
should both of them spray gas at the same time? or is it supposed to spray on the secondary only when the second barrel opens?
ill take new pictures. those you can see :D

The secondary does not have any accelerating pump functions. Only the primary has it.

I can't seem to be able to see the pictures now as they are not loading correctly. Maybe I will try again later.

ohh... i thought it's supposed to be pumping as well :D
haha. sorry about that. new knowledge for me.
i forgot to take pictures earlier this day. haven't been able to go to my grandparents house. that's where the car is.
thanks for taking the time to help me with this problem.

here's the picture..
http://cdn.2carpros.com/question_images/34361/large.JPG?1339474936

why does it have an exit when there's no pump action for that barrel?

The accelerating spray is from the side of the barrel. The central venturi for the primary and secondary are for fuel to flow when suction is created by air flowing through it. They do not spray.

I was expecting a big butterfly covering the barrel. Seems it is only for the primary venturi.

I took a video of my carburetor.
I'm gonna upload it later.
i let the choke stay open. i tested and it still backfires every once in a while. the secondary butterfly opens well at 70-80% throttle but I'm still having the backfiring problem.
also, the engine power is very low. i'm having a hard time with this.

http://youtu.be/qgCHUGjFWtE

Yes, the secondary butterfly opens rather late and that is normal.

For the lack of power and backfiring, I believe the ignition timing is too low. you would need a timing light to get the correct ignition timing. Anyway you can try this.

At the distributor there is a holding bolt that sits on a slotted hole. Mark the initial position of the distributor with a point where it sits onto the cylinder. Loosen the holding bolt and turn the distributor lightly counterclockwise.

Retighten slightly just to hold it and start engine. Retest the response. If it worsens, with engine running, loosens the bolt slightly so that you can twist the distributor and slowly turn it until you get the best idling at the highest rpm. It can be colockwise or counterwise depending on condition. Can't remember if the rotor turns clockwise or counterclockwise so one way advances the ignition timing where countering it would retard the timing. Tighten bolt and retest.

I'll do this today and give you feed back later today. :D

btw, if you're a father.
happy father's day :D

Yes, I am and thanks for the well wishes.

Same goes to you if you are one too. :)

Good evening.
I'm not :) I'm still 20.
Look :D I've done what you said and I'm so happy, it really worked. The starting power is back up and the misfiring is gone.
I did it myself.
Yay!

Problem is, there's this whistling sound that I can't pinpoint its somewhere near the carburetor and the firewall.
could it be the choke butterfly that I opened?

Whistling noise can be due to vacuum leakages or the air cleaner is not installed correctly. If you wish to locate the source, get a rubber hose to act as sthethoscope and move around till you get the source.

I can't find it. It's so annoying, I'll try again tomorrow. I only get the time to see my car when it's evening.