Likes Likes:  5
Thanks Thanks:  1
Page 1 of 2 12 LastLast
Results 1 to 10 of 15

Thread: pict 34 3 and other vw questions in one thread

  1. #1
    20+ Posts the13bats's Avatar
    User ID
    16858
    Join Date
    Jan 2014
    Location
    orange
    Posts
    23

    Default pict 34 3 and other vw questions in one thread

    Warning im ADD OCD and have nervious issues this will be long winded.

    I will assume there are at least a few cats here tech savvy on the pict 34 3 and vw engines,

    Ive been a gear head close to 40 years wrenching on all kinds of junk including other trikes and vw vehicles but this time im not finding the solution,

    One problem is it doesnt always do it,

    Basics 1600 dual port pict 34 3 vac dizzy,

    To the best of my testing no vac leaks and valves are set.

    The carb is adjusted as per rob and daves online papers which with the exception of fast idle adjustments most agree on turning the pict 34 3.

    Its not epic.

    But here is my issue, take off run thru the gears, it doesnt like 4th before 40mph then up to 45 to 50 now get off it, downshift to 3th and about 8 out of 10 times it bucks and stumbles wants to die takes careful finesse of throttle to keep it going then smooths out runs great, within a minute,

    Did it go lean or rich?

    Another symptom, running about 35 to 40 in 3rd floor it, sometimes it takes off smooth and hard, well as hard as a 1600 takes off other times it has a stumbling flat spot that then after it clears it doesnt do it again during that outing

    Has anyone has had these type issues.

    Now related unrelated,

    Pict 34 3 adjustments,

    For the accelerator squirter, how do we know if it needs more or less?

    Since a trike is lighter could it might be happier with less squirt?

    Any great way to know the squirter is set correctly?

    I have seen at least 4 different ways to set the so called fast idle screw on the choke stepped cam,

    Most want a little more that the screw just touching the cam .25 turn past just touching,

    That really drives my OCD nuts anyone got a more exacting way of setting it?

    Just how critical or forgiving is it?

    Many thanks

    cheers

    b
    "We are the music makers and we are the dreamers of the dreams"

  2. #2
    Old Redneck Motorhead
    VW Tech Contributor
    TrikeTalk Moderator
    DeathBySnuSnu's Avatar
    User ID
    7688
    Join Date
    Mar 2012
    Location
    Vicksburg MS USA
    Posts
    1,496
    FT Author
    2 Threads

    Default

    Well......I know very little about stock parts. I can throw out there a few very general thought, but not very specific and lots of it is second hand info.

    Vacuum leaks. Intakes, joint boots, carb base, rotted out intake manifold at heat riser port. Loose butterfly shaft in the carb base.

    Diaphragm on the distributor, advancing, sticking, worn out bushings, vac hose plugged to correct carb port.

    But...it sounds more like you are choking on fuel.

    Carb, float, needle and seat.

    I hear of this more and more......fuel pump. I see others with crazy pressure issues. The stock type replacement pumps just are not right. The flex of the diaphragm and/or the tension of the spring is not right over pressuring the carb. You only need 2 to 3 lbs at the max or it will be running over inside.

  3. #3
    20+ Posts the13bats's Avatar
    User ID
    16858
    Join Date
    Jan 2014
    Location
    orange
    Posts
    23

    Default

    Like i tried to point out the silly stuff i have eliminated, but i felt like this IS an issue i know just slipping my mind posted here to butt kick it into gear now the fuel pressure theory, i need to look at that,

    A side note on stock vw and solex especially pict 34 3 and other models with bypass and mixture screws,

    Any vaccum leak even small will make it basically impossible to adjust, the bypass screw will do little to nothing and the mixture screw will do nothing but perhaps kill the engine if screwed too far.

    Both these screws have an initial setting of 2.5 turns out from soft bottom out, screw them in too hard something can get ruined.

    When adjusting them keep in mind 2-3 total turns on either is all it should take to find that sweet spot,

    You really can hear that slight drop turning the mixture screw in, most times sweet spot is with .25 a turn from that 2.5 initial setting.

    Many times when a person cant get the responses they desire or the bypass screw just wont set a nice idle they make the mistake of turning the fast idle screw, this is a nono on pict 34 3 and any pict with both mixture and bypass adjustments.

    To set the fast idle screw it should just drag or touch the very bottom of the stepped choke cam then .25 in,

    I have seen cases that needed perhaps a hair more than .25 but i do mean a hair.

    It drives my OCD nuts.

    At first one might say well if fuel pressure is too high there would be issues at idle, maybe but just arm chair diagnostics, if im going 45 50 mph in 4th then i am thinking the float is down and allowing steady flow from pump,

    When i abruptly slow down there could be a surge so to speak and the carb gets overfilled for a moment,

    Im thinking if the float is down needle open then its easy for the fuel pressure to keep the needle open a few moments but it doesnt at idle because the pressure isnt really great enough to push the needle open but rather just flow too much when it is open,

    Havent felt goid enough yet to go do some simple tests for this theory but i do know 2.5 to 3 lbs is all a solex can stand, thats fairly low and 4 to 5lbs might be enough to cause this and even in this odd intermittent way.

    Looking forward to checking it out.

    Will update
    "We are the music makers and we are the dreamers of the dreams"

  4. #4
    400+ Posts
    User ID
    27904
    Join Date
    Mar 2018
    Location
    Fernley
    Posts
    401

    Default

    wow, not my carb set up, but when I read about this happeing on my set up, well it was more about not getting enough air at the time, to much fuel to air ratio. For me to correct the issue I need to up grade air flow in the carb. Of course I live at 4500 feet altitude and most are set factory for much lower elevation.. Wish I could help other than this.

    samba is the VW place, many know alot about stock carb.'s and their issues. I learned alot about the VW from just reading the threads and what others had to say.

    Hope you resolve this issue you are having.

    oh and I did over adjust the carb.'s to compensate for excessive fuel pressure, once corrected the pressure issue, well I had to reset the carb.'s again, but it does run nice now.

  5. #5
    20+ Posts the13bats's Avatar
    User ID
    16858
    Join Date
    Jan 2014
    Location
    orange
    Posts
    23

    Default

    I used to like thesamba but like with many forums it offers little to me now, too many overbearing cats who think they know it all and dont know enough.

    Its no help and i cant learn if a walking pile of fertilizer wants to force on me my problem is something already ruled out.

    I did post a version of this there and my favorite reply was a guy saying my carb is too big for a light weight trike, whew, you can lead a horse to knowledge but cant make him think, guess he would really balk that my last trike ran dual 48 webers.

    C'est la vie.

    In the case of the pict 34 3 im running there is no way to turn it for too much fuel pressure just add a regulator and since about 3lbs is a nice place for a solex on a stock rig i look into one of those low pressure 1-6 lbs that mr gasket and others sell with the dial you turn but like with many things guys on hamb report they are dangerous junk they will spray fuel all over,

    So the low pressure holley is my answer but i have to mail order it not one store here carries them,

    Holley was having a great sale with free shipping,

    I would bet a big gulp fuel pressure is hurting me, but to prove it i need to install that regulator, waiting on snail mail,

    Until then ill just putz with other stuff.
    "We are the music makers and we are the dreamers of the dreams"

  6. #6
    100+ Posts
    User ID
    24042
    Join Date
    Sep 2016
    Location
    Sitka, Alaska USA
    Posts
    126

    Default

    I have a difficult time following you. If you are still using the solex, the "squirter" is properly adjusted when the squirt hits the gap between the bore and the just-opening butterfly. It should give a solid stream immediately as the throttle opens and no drips before or after. The nozzle can be gently twisted and bent to aim it. Also, iirc, there is a check ball in the circuit, under the nozzle on the 34. It's a common mistake to leave it out.

    You're bound to get better and answers if you don't call the people trying to help you "walking piles of fertilizer" for suggesting that you overlooked something. Who would volunteer to step into that? If you did properly cover all the bases you wouldn't be having the problem. So if anyone is shoveling fertilizer, it's not them.

    Just my opinion.

  7. #7
    20+ Posts the13bats's Avatar
    User ID
    16858
    Join Date
    Jan 2014
    Location
    orange
    Posts
    23

    Default

    You managed to twist what i said all around,
    "We are the music makers and we are the dreamers of the dreams"

  8. #8
    Senior Moderator
    Gold Club Member
    TrikeTalk Moderator
    Gorilla's Avatar
    User ID
    976
    Join Date
    Oct 2008
    Location
    Key Largo. Fl,. USA
    Posts
    12,617

    Default

    time to get back to the issues
    Stallion #406 // 2013 Tri-Glide

  9. #9
    Old Redneck Motorhead
    VW Tech Contributor
    TrikeTalk Moderator
    DeathBySnuSnu's Avatar
    User ID
    7688
    Join Date
    Mar 2012
    Location
    Vicksburg MS USA
    Posts
    1,496
    FT Author
    2 Threads

    Default

    Just a thought. I saw (internet) where someone made up an orifice bypass to bleed off some pressure back to the suction side. Then claimed it also stopped residual line pressure and percolating carb. Cleaner starts and less gas smell with still enough line pressure for stock carb.

    No real experience myself. But it was an interesting read. Sorta made sense.

  10. #10
    20+ Posts the13bats's Avatar
    User ID
    16858
    Join Date
    Jan 2014
    Location
    orange
    Posts
    23

    Default

    I hope everyone had great holidays and a great new year,

    Sorry for my update delay but the holidays and other things pushed trike on back burner.

    The quick answer is the regulator was the fix,

    I ran the holley low pressure reg rather than that dial type as too much bad feedback of the dial type leaking or rather pouring fuel.

    My speculations were confirmed both by my testing and talking to a few old timer acvw gurus,

    I assumed my problem started with the electric fuel pump but i was informed that the stock mech fuel pump can and do have too much pressure and it seems the newer ones are really bad,

    Their fix were spacer shims some people just stacked gaskets or the real techie gear heads machine down the push rod.

    The trike is a new creature now, i want to fine tune again on a day in the 80s but i was just amazed at the difference just the regulator made, really purrs.

    The trike up and running means i soon as i hook up sink and tub in upstairs br i can get my car running which i do look forward to.

    Have a great year year,

    Cheerz

    b
    "We are the music makers and we are the dreamers of the dreams"

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 60
    Last Post: 11-20-2018, 09:00 AM
  2. other sunday to ride and eat
    By Phill Griggs in forum Trike Travel
    Replies: 2
    Last Post: 04-29-2016, 03:24 PM
  3. Replies: 10
    Last Post: 02-04-2009, 09:25 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •