Topic: Anyone know Solex 34 pict 3 carbs? For a gl1100.

[Lostboy Steve]

I got this gl1100 with carbs that were beyond repair, so i sold the set for parts and went with a single carb setup. It idles great and has great response but at low rpm under a load it stumbles if you don't really ease into it. If over 4K it's smooth. It seems like it leans out, so I played with the accelerator pump adjustment. Nothing. I noticed that if I back out the volume control screw a lot it gets better but not perfect. As I understand, these carbs rely on the idle jet for low rpm performance, and so I wonder if that's where my problem lies. A lot of fellas bolt these things on and need no adjustment and the bike rides perfectly.  The bike is very rideable as is, but the stumble is really annoying. Wondering if anyone in the sohc 4 community has and advice or experience with the conversion or perhaps old vws. Thanks.


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[scottly]

I have a little bit of experence with the pict carbs. The main difference between them and the earlier pci VW carbs is the pict's have a bypass idle system that requires the throttle blade to be completely closed, instead of cracked open by the normal idle speed screw. What often happens is guys try to set the idle speed with the screw on the throttle lever, instead of the bypass air screw, and try to compensate with the volume screw. Things can get out of wack, and it's a real pain to get the adjustments back into line. After my buddy tried messing with one, he was ready to push the bug into the nearest mine shaft. It took a lot of trial and error on my part to make it run right.
 

[Lostboy Steve]

I have a little bit of experence with the pict carbs. The main difference between them and the earlier pci VW carbs is the pict's have a bypass idle system that requires the throttle blade to be completely closed, instead of cracked open by the normal idle speed screw. What often happens is guys try to set the idle speed with the screw on the throttle lever, instead of the bypass air screw, and try to compensate with the volume screw. Things can get out of wack, and it's a real pain to get the adjustments back into line. After my buddy tried messing with one, he was ready to push the bug into the nearest mine shaft. It took a lot of trial and error on my part to make it run right.

Yeah, that's almost where I'm at. It rides really well and higher rpm is great.

I did read an article about a guy who hated the pict 3 until he soldered closed the plate hole to increase vacuum. I may just have to try that.


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[scottly]

I did read an article about a guy who hated the pict 3 until he soldered closed the plate hole to increase vacuum. I may just have to try that.

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That's like covering pods with duct-tape to "solve" tuning issues.
First thing I would check is the adjustment of the screw at the top of the throttle arm; with the choke completely open, there should be a slight gap between the end of the screw and the lowest notch on the fast idle cam. In this pic, the screw is resting on the second cam notch up.
   

[scottly]

If the throttle plate isn't fully closed at idle, it will uncover the tiny transition holes; these normally come into play at low throttle openings, before the main jet kicks in.
 

[scottly]

There is a fair range of accelerator pump stroke adjustment; the longer stroke setting is 2-3 times the travel of the short stroke setting.

[Lostboy Steve]

You are a god send. I'm going to play with these settings later today.


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[Lostboy Steve]

I did read an article about a guy who hated the pict 3 until he soldered closed the plate hole to increase vacuum. I may just have to try that.

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That's like covering pods with duct-tape to "solve" tuning issues.
First thing I would check is the adjustment of the screw at the top of the throttle arm; with the choke completely open, there should be a slight gap between the end of the screw and the lowest notch on the fast idle cam. In this pic, the screw is resting on the second cam notch up.
 

The reason he closed the hole was because the carb is designed to be used with a dual? Vacuum Advance distributor? Lol idk, I'm not really a vw guy.


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[Lostboy Steve]

Well scottly, I spent most of the day yesterday adjusting, riding, adjusting, riding, and I haven't fixed a damned thing. Lol

I still have a significant stumble between 2000-4500 rpms. If I goose the throttle the accelerator pump (which is in the middle position) seems to try to make up for it. I rode it a total of 50 miles and used 5 gallons of gas doing so. It's strange because it doesn't seem rich.


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[dusterdude]

Steve,come on over to classicgoldwings.com,be glad to have you.

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[scottly]

Steve, where did you get this carb and what do you know about it's history? The VW Solex carbs in any iteration were not really considered performance carbs; the pict 34 has a 34mm throttle plate, with a small 25mm venturi, and the 1600cc motor it was used on only made about 60 HP. Why is this a preferred carb for the GL? You and duster need to educate me on GL's. 

[Lostboy Steve]

Steve, where did you get this carb and what do you know about it's history? The VW Solex carbs in any iteration were not really considered performance carbs; the pict 34 has a 34mm throttle plate, with a small 25mm venturi, and the 1600cc motor it was used on only made about 60 HP. Why is this a preferred carb for the GL? You and duster need to educate me on GL's. 

Singlecarbconversions.com

It's a clone of a solex.
I kind of wish I had taken the time to make a single downdraft Weber manifold but this guys reviews are wonderful with most of his customers saying it was an easy bolt on and go conversion.


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[Lostboy Steve]

Steve,come on over to classicgoldwings.com,be glad to have you.

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Will do, thanks!


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[scottly]

Steve, where did you get this carb and what do you know about it's history? The VW Solex carbs in any iteration were not really considered performance carbs; the pict 34 has a 34mm throttle plate, with a small 25mm venturi, and the 1600cc motor it was used on only made about 60 HP. Why is this a preferred carb for the GL? You and duster need to educate me on GL's. 

Singlecarbconversions.com

It's a clone of a solex.
I kind of wish I had taken the time to make a single downdraft Weber manifold but this guys reviews are wonderful with most of his customers saying it was an easy bolt on and go conversion.


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Biting my tongue a bit now. Contact the seller and see if he has any answers for your issues. If not, ask for your money back. I'm not impressed with the design of the manifold, nor with the choice of carb for the application.   

[dusterdude]

Steve, where did you get this carb and what do you know about it's history? The VW Solex carbs in any iteration were not really considered performance carbs; the pict 34 has a 34mm throttle plate, with a small 25mm venturi, and the 1600cc motor it was used on only made about 60 HP. Why is this a preferred carb for the GL? You and duster need to educate me on GL's. 

Scottly,im not sure but  the old goldwing guys say they are the ones to run.

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[Lostboy Steve]

Steve, where did you get this carb and what do you know about it's history? The VW Solex carbs in any iteration were not really considered performance carbs; the pict 34 has a 34mm throttle plate, with a small 25mm venturi, and the 1600cc motor it was used on only made about 60 HP. Why is this a preferred carb for the GL? You and duster need to educate me on GL's. 

Scottly,im not sure but  the old goldwing guys say they are the ones to run.

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Yeah lots of people have success with them, just not me. Apparently I am supposed to plug both vacuum lines and run without the advancer. Which I tried and it doesn't make any difference with the problem that I'm having. Christ, all I wanted to do was have a bike to ride while I fiddled with my 550s. Supposed to be a bolt on and go. Lol again, I have the skills to build my own manifold, but that wasn't the goal here.


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[scottly]

Apparently I am supposed to plug both vacuum lines and run without the advancer.
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Does the GL have a vacuum advance?? I understand the desire to run a simple single carb setup, but the pict would have been very low on my list of suitable mixers, even on a VW. A common setup back in the day was the Holley "Bug Spray", which was a two barrel carb, with one barrel serving each pair of cylinders. Another option used a Holley/Weber progressive two barrel that fed all four cylinders from both barrels. There were also twin carb setups that used two Weber one barrel 34 ICT's, which have a 34mm throttle plate and a 29mm venturi, so one would probably out flow a single pict. 

[dusterdude]

It does have a vacuum advance

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[scottly]

Steve, I can't think of any valid reason to disable the vacuum advance?? Can you post the instructions included with the kit?
Duster, CB Performance has brand new Weber 34 ICT for $153, and what are apparently Solex PICT clones for $319.
I'll check tomorrow to see if the Weber mounting flange is the same as the Solex.

[dusterdude]

Cool,thanks scottly

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[CBGhia]

The GL does not have a vacuum advance. 
The 34 Pict3 was designed for the vacuum advance from the VW distributor.  That is why everyone in the VW world has problems with that carb when they switch to the 009 distributor.   Also the reason I am still rocking a vacuum advance dist on my Ghia. 

First thing I was thinking about...  did you block all of the Vacuum ports on the front and side of the carb?  Just use those little rubber nipples from the auto parts store.

This info was taken from a page specifically about tuning the solex 34 with the 009. 

"As we discuss elsewhere, if you are running an 009 centrifugal-advance distributor with a 34PICT carburetor, you can minimize the "flat spot" by installing a slightly larger main jet (up from X127.5 to X130 or X132.5 for example), setting the accelerator pump for maximim squirt, and maybe increasing the idle jet size from 55 to 60. Then set the maximum distributor advance to as much of the 28-32 degrees BTDC as it can take without the engine detonating/pinging."

The jet sizes may be different for you on the GL. 

Here is another site that has some steps to try http://www.aircooledtech.com/34pict3_modification/

I am interested in hearing how it works out for you.


Edit:  Can you snap some pictures of the setup installed?  from a few angles would be good too. 

[scottly]

The Weber mounting holes are about 1/8" narrower than the Solex studs, so the holes in the manifold would have to be elongated on the inside. The throttle cable on the Weber would need routing above the throttle shaft, instead of under the shaft like the Solex.
Oh, I also noticed these Weber have no choke or cold-start system!?

[CBGhia]

It would be so nice if someone made intake manifolds for the dual ICTs for the GL1000.   I know Randak has the kit for 40 IDAs, but that is major overkill.   These little guys would be awesome on the wing.

[Lostboy Steve]

I did try those vw tricks. Last night I took it off the intake and rivited the hole in the plate (just in case I want to revert later) it is foggy as a anything this morning but I think I'm going to ride into work anyway. I'll let you know how it works out.


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[Lostboy Steve]

It would be so nice if someone made intake manifolds for the dual ICTs for the GL1000.   I know Randak has the kit for 40 IDAs, but that is major overkill.   These little guys would be awesome on the wing.

If I had seen this last night I would have shown even better pics with the tank off.




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