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 Smiley
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| posted on April 2nd, 2011 at 12:12 PM |
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More Carby Questions 31PICt-3 - No idle
Hey all.
I'm putting a 31PICT Carby on the 1600 twinport engine that's in the Baja.
I was just wondering what jet sizes people would recommend with this setup?
Currently main is 130.
Looking down the throat the air correction appears to be 110.
Also does anyone know what these jets are on the RHS of the carby? One must be the idle but what's the other?
The one on the right is a g52.5 and the one on the left is also a g52.5.
Which is the idle and what's the second jet for?
Smiley 
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 Bizarre
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| posted on April 2nd, 2011 at 12:39 PM |
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Read here
http://www.thesamba.com/vw/forum/viewtopic.php?p=4378212
Seems to be a bit of history with these carbs
Futue te ipsum!!!
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Smiley
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| posted on April 2nd, 2011 at 04:05 PM |
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Ok.
So the carby is on the car now.
Runs quite well, but it won't idle.
Timing is set to 32° advanced and that's around 10° at idle.
As mentioned above main jet is 130.
I've changed one of the jets on the RHS to a 55. Then swapped them. No real difference either way.
Can anyone advise what the problem is?
Smiley
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BRUTUS
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| posted on April 2nd, 2011 at 04:40 PM |
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Do you mean it will not run at idle speed? Or it can't idle: ie. it runs above 1000rpm all the time?
Maybe one of the jets has been plugged to act as a 'blank' to fill the hole where a e-mag cut-off idle jet was.
The idle jet should be the one to the left as shown in your pic....?
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Joel
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| posted on April 2nd, 2011 at 04:49 PM |
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The second Idle jet on the 45degree angle is the aux power jet.
If you're getting a hesitation on acceleration in the mid range you need to go bigger with it.
I ran a few of these on 1600 twinports, those sizes are still for the stock 1300tp, it should still Idle slightly though.
I'll check when I'm in the shed what sizes I went with for a 1600DP
It took alot of trial and error but I got it set perfect from idle to redline.
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Smiley
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| posted on April 2nd, 2011 at 04:53 PM |
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| Quote: | Originally
posted by BRUTUS
Do you mean it will not run at idle speed? Or it can't idle: ie. it runs above 1000rpm all the time?
Maybe one of the jets has been plugged to act as a 'blank' to fill the hole where a e-mag cut-off idle jet was.
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It will not idle, ie stalls.
Both the jets are opened, I've pulled them and cleaned them, blown them out and blown both circuits in the carby out.
Smiley
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| posted on April 2nd, 2011 at 04:55 PM |
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| Quote: | Originally
posted by Joel
The second Idle jet on the 45degree angle is the aux power jet.
If you're getting a hesitation on acceleration in the mid range you need to go bigger with it.
I ran a few of these on 1600 twinports, those sizes are still for the stock 1300tp, it should still Idle slightly though.
I'll check when I'm in the shed what sizes I went with for a 1600DP
It took alot of trial and error but I got it set perfect from idle to redline.
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Thanks Joel, it's good to get a straight answer. At one stage there I did have it idling, only just. It was right on the verge of stalling for a
little while before it eventually did.
Smiley
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Joel
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| posted on April 2nd, 2011 at 05:02 PM |
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Just had a look the same carb I've got on a bog stock 1600Dp with 4into1 header and quite pack muffler has a G60 in the power jet (left one) and a
G55 in the Idle jet on the right.
That took alot of experimenting to get right but it was dead smooth after all that though
I would say it had a 135 main jet too.
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| posted on April 2nd, 2011 at 05:23 PM |
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Thanks.
I'll have to buy some larger jets.
Smiley
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BRUTUS
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| posted on April 2nd, 2011 at 05:57 PM |
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The one on the left (at 45deg angle to body) is the idle jet, original size g52.5.
The one on the right (at 90deg angle to body) is the aux. fuel nozzle, orig. size g45.
So the idle is the one one the left.
The main should have x130 originally.
The air correction jet/emulsion tube should have been 170W (maybe that is what appears to be 110 as seen from top?).
The cut-off idle solenoid (or its plug) should be on the other side of the unit. You need to set the idle bypass (large) and mixture screws (small)
like on the 30Pict3.
Seems this setup was originally for a 1300 engine. The main will need to be at least about 135 probably.
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Smiley
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| posted on April 3rd, 2011 at 01:27 AM |
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| Quote: | Originally
posted by Joel
a G60 in the power jet (left one) and a G55 in the Idle jet on the right.
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| Quote: | Originally
posted by BRUTUS
The one on the left (at 45deg angle to body) is the idle jet, original size g52.5.
The one on the right (at 90deg angle to body) is the aux. fuel nozzle, orig. size g45.
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So who is right??
I looks like all my jets might be slightly too small.
And it does have the cutoff solenoid on the LHS of the carby.
Smiley
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Joel
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| posted on April 3rd, 2011 at 12:06 PM |
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Pffft I'm always right 
joke, Brutus could be, to be honest I've never looked into it, I just ASSuMEd it was the idle jet on the right as thats stock postion on all other
carbs and when I was having stumbling on acceleration at revs playing with the left jet sorted it, where as the right jet was more down low.
There's very little technical literature on these carbs out there, if you mention 31pict-3 on thesamba you will get crazy orrrstralian no such carb
exists, but then they say that with 1300DP engines too.
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Smiley
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| posted on April 9th, 2011 at 01:25 PM |
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Ok.
I'm still having the same problem.
Have just rebuilt the carby. Cleaned everything out completely.
Jets are as follows -
Main - 135
Idle - 55
Power Correction - 60
Air Correction - 110Z
Car still will not idle. It runs great as soon as the revs are up a little about idle, sounds very strong and revs smoothly. Have yet to take it for a
drive. As soon as the revs drop down to idle it just cuts out.
Dizzy is 009, what should the timing be set to?
Could this cause it not to idle?
Any other ideas what the problem could be?
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Smiley
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| posted on April 9th, 2011 at 01:30 PM |
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Just went and double checked the timing.
Is around 32-34 degrees at full advance.
Drops back to around 10 at idle before stalling.
Smiley
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Smiley
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| posted on April 9th, 2011 at 02:06 PM |
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Is the idle with these carbys adjusted with the stop screw on the throttle arm like the early carbs?
Or is it adjusted with the bypass screw like the later carbs?
Or is it a bit of both?
I'm really at a loss as to what's not working.
Smiley
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matberry
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| posted on April 9th, 2011 at 02:48 PM |
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Throttle stop screw is ONLY for fast idle adjustment ie. while the choke is on. It should be set initially at about 1 turn in after it engages the
fast idle cam when in the running position. Back the screw right out until you have an air gap to the choke fast idle cam, then screw it in to touch
and then +1 turn. Idle speed is adjusted at the air bleed/bypass screw (the big one), then set mixture and reset speed then mixture again.
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matberry
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| posted on April 9th, 2011 at 02:50 PM |
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Didn't you have the pop-rivet in the throttle butterfly hole? Is it still there?
The main problem IMO is the 009....get rid of it or the 34pict.
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Smiley
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| posted on April 9th, 2011 at 03:32 PM |
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I couldn't get the 34 to run, tried two different carbies and 3 different dizzys.
So I ditched that idea and went back to the 31PICt-3 and 009 Dissy off my 1300 that died. I've never had a single problem with tuning or running this
pair. But now it's a no idle.
So I caved and just rebuilt a Bosch 014 Mechanical/vacuum advance dizzy and am about to tried that.
Smiley
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Smiley
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| posted on April 9th, 2011 at 03:47 PM |
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What timing should this Dizzy be set to??
I can't seem to get it to run right at all now.
Smiley
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| posted on April 9th, 2011 at 04:39 PM |
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Ok.
I give up now.
I've tried every single combination and every suggestion and idea that anyone has put to me.
The piece of shit still won't run.
Anyone want to buy a Baja? $50 and you can have it, I'm over this shit.
Smiley
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| posted on April 9th, 2011 at 04:47 PM |
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You may have a manifold leak, Mr LookoutorImayjustburnmybajaSmiley.......
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Smiley
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| posted on April 9th, 2011 at 04:56 PM |
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| Quote: | Originally
posted by matberry
You may have a manifold leak, Mr LookoutorImayjustburnmybajaSmiley.......
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Nope, new boots and new gaskets.
Plus that would cause it it idle up rather than not idle wouldn't it?
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| posted on April 9th, 2011 at 05:04 PM |
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not if there's not enough fuel to idle up
why all the dissy changing?
Timing around 10* initial/30* total can't go wrong.
Just cause you put in new parts doesn't mean there's no leak, check with an aresol can of carb cleaner or the like.
Going out now... good luck
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pod
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| posted on April 9th, 2011 at 05:12 PM |
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| Quote: |
And it does have the cutoff solenoid on the LHS of the carby.
Smiley
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is this still working??
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Smiley
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| posted on April 9th, 2011 at 05:15 PM |
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| Quote: | Originally
posted by pod
| Quote: |
And it does have the cutoff solenoid on the LHS of the carby.
Smiley
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is this still working??
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Yep. Clicks on and off like it's supposed to.
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| posted on April 9th, 2011 at 05:18 PM |
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| Quote: | Originally
posted by matberry
why all the dissy changing?
Timing around 10* initial/30* total can't go wrong.
Just cause you put in new parts doesn't mean there's no leak, check with an aresol can of carb cleaner or the like.
Going out now... good luck
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I have tried a stock 009, a modified 009 with the flat spot removed, a brand new SVDA and the old mech/vac dissy I rebuilt this arvo.
With the mech/vac dissy I just tried I set the total advance at 30 and then it dropped off to below 0° and stalled. So it had over 40° advance? This
isn't right.
Smiley
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matberry
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| posted on April 9th, 2011 at 05:24 PM |
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Set vac total with vac disconnected, check idle solenoid with compressed air while powered
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Smiley
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| posted on April 9th, 2011 at 05:36 PM |
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| Quote: | Originally
posted by matberry
check idle solenoid with compressed air while powered
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How do I do this?
And too late on the vac setting.
I've put the original stock 009 back in.
This carby and this dizzy were on my 1300 and ran perfectly, never had any dramas.
I also just leak checked the manifold and carby, no leaks.
What else could it be?
Valves? Fucked leads? Plugs?
Smiley
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matberry
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| posted on April 10th, 2011 at 08:03 AM |
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| Quote: | Originally
posted by Smiley
| Quote: | Originally
posted by matberry
check idle solenoid with compressed air while powered
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How do I do this?
Smiley
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Take out the solenoid jet, hook 12v to the terminal, earth the body (it should click same as when it's installed), and blow compressed air through
the jet.
May have been blocked and this is the only way to check/clear it.
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| posted on April 10th, 2011 at 12:11 PM |
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| Quote: | Originally
posted by matberry
| Quote: | Originally
posted by Smiley
| Quote: | Originally
posted by matberry
check idle solenoid with compressed air while powered
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How do I do this?
Smiley
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Take out the solenoid jet, hook 12v to the terminal, earth the body (it should click same as when it's installed), and blow compressed air through
the jet.
May have been blocked and this is the only way to check/clear it.
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The solenoid is just a plunger on the LHS of the carby. All it does is seal against a seat and cut the fuel off to prevent runon. There are no holes
in it.
I swapped in another solenoid, it made no difference.
Smiley
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