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post #1 of (permalink) Old 10-27-2002, 04:41 PM Thread Starter
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pony carb is in!

Howdy!

I installed my pony carb today and my truck actually runs. I am thoroughly astonished.

The bolts on the stock carb were a b!tch to get off. I tested the red samurai insulator on the bottom of the Pony before installing it but forgot to line up the bolt holes instead of the bores (DOH!!) I got it all put together and took it for test drive. Ran like crap...bucking and starving and bogging and whatever.

got home and checked the accel pump (works fine) and tried the secondary. It was hitting the insulator. Sh!t. Took the carb off again (not too bad after the stock one) and dremeled it out nice. Popped it back on and tested again. Much better, but still not too good. I could tell the thing is gonna fly when it gets tuned up right, though. Woohoo!

When I was prepping for this I read everything I could find on the swap. Lots and lots of posts here on the BBS and stuff on izook. I swear I saw a basic pony carb tuning guide someplace but I cant find it now. I don't have the carb tuning gene, so I will have to follow some instructions.

Does anyone know where I saw this or have one handy? I don't even know which screws are for the mixture, much less how to adjust them correctly. I know which one is the idle speed screw, though (patting self on back).

thanks for any advice or help!

~daxe
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post #2 of (permalink) Old 10-27-2002, 04:57 PM
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Re: pony carb is in!

There are three screws for adjustments. First, idle mixture..it's at the base of the carb and adjusts the amount of gas flowing at idle. Second, idle speed screw, located on the throttle shaft and adjusts idle RPM. Third, is optional. It is the BCDD screw. Stands for Boost Controlled Deceleration Device. This is the component that controls how fast the carb will return to idle. Clockwise for slower return, anti C.W. for quicker return. This serves more of a purpose than just this however. By holding the primary throttle plate open and allowing it to slowly close after fully releasing the throttle, allows some fuel to keep flowing through the carb. and t combust as usual. If it just 'slaps' shut, the motor will produce high levels of NOX, due to the extreme lean condition created by two things 1) high RPM 2) throttle plate closed(only idle fuel passing through). Anyways, just rambling now..... L8r.
post #3 of (permalink) Old 10-27-2002, 05:11 PM Thread Starter
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Re: pony carb is in!

>> First, idle mixture..it's at the base of the carb and adjusts the amount of gas flowing at idle.

Hmm. I need to find this.

>> Second, idle speed screw, located on the throttle shaft and adjusts idle RPM.

I knew that one. I twiddled it, even.

>>Third, is optional. It is the BCDD screw. Stands for Boost Controlled Deceleration Device. This is the component that controls how fast the carb will return to idle.

I took this thing off because A) its optional and B) it was in the way of the airbowl seating on top of the carb.

>> If it just 'slaps' shut, the motor will produce high levels of NOX, due to the extreme lean condition created by two things 1) high RPM 2) throttle plate closed(only idle fuel passing through).

This is interesting. if I cannot get the thing to stop stumbling and trying to conk out on corners and stuff I might try to throw this back on. I wsh I could use a different air cleaner!! This airbowl thing with the hoses all over the place is ridiculous. I;d even be happy to cut a hole in my hood. hmm. maybe I;ll start a thread on this.

~daxe
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post #4 of (permalink) Old 10-27-2002, 05:16 PM
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Re: pony carb is in!

Stumbling on corners sounds more like a fuel level problem. Have you checked the float level? Take a look through the little glass window on the carb. Do you see gas? Also, the BCDD didn't get in the way on my install?? Maybe a different year PONY carb?? L8r.
post #5 of (permalink) Old 10-27-2002, 05:23 PM
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Re: pony carb is in!

Make sure you connected the 12v to the fuel shutoff soliniod and it is clean and works or it will run funky like you say.
Is it idleing okay? You may have to remove a plug to get to the
screw BTW.
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post #6 of (permalink) Old 10-27-2002, 05:26 PM Thread Starter
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Re: pony carb is in!

>>Have you checked the float level?

nope! didnt know I was supposed to.

>> Take a look through the little glass window on the carb. Do you see gas?

well, its pitch black right now and the little window is facing the firewall, so thats two reasons I cant check it at the moment. Should it have fuel in it when its just sitting there not running? Maybe I can get a flashlight and my little mirror to check.

>>Also, the BCDD didn't get in the way on my install?? Maybe a different year PONY carb??

I dunno what year this one is. If you viewed it from the side, the BCDD stuck up farther than the round part of the carb the airbowl seats against. The airbowl itself is all even with or lower than that round part when its on top of the carb, so it contacted the top of the BCDD. I considered whacking the crap out of the neck of the airbowl with the same ballpeen hammer I used for the other part, but decided to go for the simplicty.

~daxe
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post #7 of (permalink) Old 10-27-2002, 05:36 PM Thread Starter
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Re: pony carb is in!

Hey Glenn! Aren't you proud of me? I did this whole thing without having to call you even once. [img]images/graemlins/crazy.gif[/img]

I did connect the wire you mention, though I didnt check to see it was getting 12V when the truck was started. Its a black wire with a white tracer, right? I got it off the firewall going into a connector that also had a blue wire (I think).

It idles pretty nice, but I hear that "poom poom" sound from the tailpipe a lot. Dunno if that's important. Where is that idle screw located on the bottom, in the center under the fuel level window?

There is also lots of stuff I can take off this motor now, right? The Charcoal canister is useless, there's a lot of little vacuum hoses that do nothing now and that fitting thats near the top coolant inlet on the motor? The motor looks a lot more friendly without some of that junk all over it.

[img]images/graemlins/smirk.gif[/img]

~daxe
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post #8 of (permalink) Old 10-27-2002, 05:50 PM
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Re: pony carb is in!

Yea ya done good boy! Make sure it has 12v. (test light or VOM)
If it doesn't it will do just what you are talking about.
the idle mixture screw sticks out from the base, (On one end or the other you will see it.) It will be sealed and you need to pop the cover off so You can set the idle mixture. Sounds like you are lean on idle. I left the can on, But you can clean up alot of the hoses. Make it look stock [img]images/graemlins/wink.gif[/img] That way if you get the hood popped for inspection they won't know any differnt. Just make sure you still have a vaccumm advance
hose to the distributor.
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post #9 of (permalink) Old 10-27-2002, 06:07 PM Thread Starter
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Re: pony carb is in!

>>Yea ya done good boy!

[img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img]

>>Make sure it has 12v. (test light or VOM)

will do.

>>If it doesn't it will do just what you are talking about.

that would be very cool if it was that easy to fix. If I am not getting 12V from that wire can I use any ignition switched12V feed?

>>the idle mixture screw sticks out from the base, (On one end or the other you will see it.) It will be sealed and you need to pop the cover off so You can set the idle mixture.

I think I know which one it is. is this it?



>Sounds like you are lean on idle.

which way should I turn the screw to make it more rich?

>I left the can on,

It would be nice to make it hollow with a hinged lid and keep tools in it.

> Just make sure you still have a vaccumm advance
hose to the distributor.

I do. I even used new vac hose for that and everything else I left on.

~daxe (I'm learnin, slow but sure! [img]images/graemlins/tongue.gif[/img] )
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post #10 of (permalink) Old 10-27-2002, 06:07 PM
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Re: pony carb is in!

Well, the float bowl should always have fuel in it. So your light/mirror trick is a good idea to check that. The reason you are having problems with the BCDD clearing the airbox is because the carb is installed 180* from the way mine is (my float level points to the rad, not firewall). I can't remember why this is (iZook.com article shows an install like yours), but it's OK. [img]images/graemlins/wink.gif[/img] This also means that your idle mixture screw will be pointing towards your battery. It could have a cap on it, like previously mentioned. What happens if you disconnect the electrical connection to the idle-cut solenoid? Does the motor die instantly? or run rough, sputter and then die?? (referring to the single wire going to carb)

As far as richening the mix, I believe counter-clockwise is the way to go, but it will also affect you idle RPM. You really need to use both together, little at a time.
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