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oldbusboy Samba Member

Joined: June 25, 2006 Posts: 623 Location: Bowen Island, BC Canada
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Posted: Sun Jan 19, 2014 10:23 pm Post subject: |
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Hi Rob,
Thanks!
I'll make a few more tweaks. The green light does go out when I give it some gas, although prior to a complete carb rebuild it didn't, so I suspect a little adjustment will help
Trevor _________________ 1958 kombi
1968 porsche |
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billfred1 Samba Member
Joined: May 19, 2014 Posts: 287 Location: Bloomington, IN
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Posted: Tue Aug 12, 2014 10:16 am Post subject: |
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Sorry to rehash this old thread, all the 30pict-1 experts are here.
I just rebuilt my 66 (with a 1600 kit). I’ve got the 30Pict-1 carb. It seems to idle fine, but my volume control screw makes no change to the RPMS. I’ve set it at about 2.5 turns out.
I haven’t driven it, since I just rebuilt it (waiting on new clutch cable). I did set the dwell and timing.
I’ve got a carb rebuild kit on order. I did disassemble and clean the carb really well recently. Is the volume control damaged somehow? Does it matter, if I'm not having problems with idle? _________________ Bill
1966 Beetle |
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glutamodo  The Android

Joined: July 13, 2004 Posts: 26527 Location: Douglas, WY
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Posted: Tue Aug 12, 2014 10:20 am Post subject: |
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The volume screw should kill the engine if screwed in too far. I'd get out the air compressor and blow 100 PSI into that passenge with the pilot jet removed. And make sure the pilot jet isn't blocked. |
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billfred1 Samba Member
Joined: May 19, 2014 Posts: 287 Location: Bloomington, IN
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Posted: Tue Aug 12, 2014 11:01 am Post subject: |
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Great. I've got the cut off valve. I'll take that off, and take the pilot jet out and clean it. _________________ Bill
1966 Beetle |
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OldmanVw Samba Member
Joined: November 24, 2004 Posts: 20 Location: Gig Harbor, WA
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Posted: Tue Jun 17, 2025 7:37 pm Post subject: Re: 30 PICT 1 carb tuning |
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Great thread. 30 pict -1 as well. Backed out the volume screw 2.5 turns. Idle adjustment screw is all the way in, and motor only is at 550 rpm.
Dwell is at 48 degrees. Gap set to .016”
40 hp motor. single cab.
What am I missing? Should I take carb out and just clean passages, then reassemble and go through this again?
If I pull on throttle, revs up fine. Then returns to miserable, slow idle. _________________ Selling toys, books and other cool stuff
Wanting a 58 Beetle, Diamond Gray. Just like the one I sold in McDonough GA in 2001 |
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rcooled Samba Member

Joined: September 20, 2008 Posts: 2755 Location: Santa Cruz, CA
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Posted: Thu Jun 19, 2025 6:31 pm Post subject: Re: 30 PICT 1 carb tuning |
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OldmanVw wrote: |
What am I missing? |
Besides the low idle speed, does the motor run well otherwise?
What type of distributor do you have? That carb works best with a vacuum-only distributor, which was standard issue on 40HP motors.
What's your ignition timing set to? Static timing should be set at 7.5° BTDC, which is the notch in line with the case split on this 40HP pulley.
_________________ '63 Ragtop (current)
'65 Ghia coupe (totaled)
'67 Ghia convertible (current)
'69.5 Ghia convertible and
'62, '63, '65, '69 Bugs (all long gone) |
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OldmanVw Samba Member
Joined: November 24, 2004 Posts: 20 Location: Gig Harbor, WA
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Posted: Sun Jun 22, 2025 6:49 am Post subject: Re: 30 PICT 1 carb tuning |
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[quote="rcooled"]
OldmanVw wrote: |
What am I missing? |
Besides the low idle speed, does the motor run well otherwise?
What type of distributor do you have? That carb works best with a vacuum-only distributor, which was standard issue on 40HP motors.
What's your ignition timing set to? Static timing should be set at 7.5° BTDC, which is the notch in line with the case split on this 40HP
Timing is set as above. Distro is vacuum advance, after market, 6v, w short, fat brown distro cap.
Motor starts well, very poor idle. I have a rebuild kit from WW and will rebuild today. SC sat for 6 years, my father drove it, maybe, 100 miles. I should have rebuilt carb to start…
Let me get after that. _________________ Selling toys, books and other cool stuff
Wanting a 58 Beetle, Diamond Gray. Just like the one I sold in McDonough GA in 2001 |
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kreemoweet Samba Member
Joined: March 13, 2008 Posts: 4090 Location: Seattle, WA
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Posted: Sun Jun 22, 2025 1:14 pm Post subject: Re: 30 PICT 1 carb tuning |
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So why is the volume/mixture screw only out 2.5 turns if the idle speed is so low? You should let it out some till max idle speed is reached, then adjust idle screw accordingly. _________________ '67 bug: seized by the authorities
'68 bug: seized by the authorities
'71 kombi: not yet seized by the authorities
Stop dead photo links! Post your photos to The Samba Gallery! |
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OldmanVw Samba Member
Joined: November 24, 2004 Posts: 20 Location: Gig Harbor, WA
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Posted: Sun Jun 22, 2025 4:34 pm Post subject: Re: 30 PICT 1 carb tuning |
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kreemoweet wrote: |
So why is the volume/mixture screw only out 2.5 turns if the idle speed is so low? You should let it out some till max idle speed is reached, then adjust idle screw accordingly. |
Cleaned and rebuilt the carb. Did not touch the choke nor the accelerator pumpgasket, as I think those does not effect idle. All parts cleaned and blown out w air. Used WW rebuild kit,
Still same challenges. With three turns out on the volume screw, very low lumpy idle - with idle screw adjusted in completely. More turns out on volume control did not being idle up.
If I adjust the accelerator cable, bring more of the rod through and advance the lever, I get a better idle, but I am cheating the respons on the pedal.
I am sure it is something goddamn easy, but I am frustrated.
Open to any and all ideas.
Points adjusted, timed well and dwell at 48.9 degrees. _________________ Selling toys, books and other cool stuff
Wanting a 58 Beetle, Diamond Gray. Just like the one I sold in McDonough GA in 2001 |
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Eric&Barb Samba Member

Joined: September 19, 2004 Posts: 25895 Location: Olympia Wash Rinse & Repeat
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Posted: Sun Jun 22, 2025 4:58 pm Post subject: Re: 30 PICT 1 carb tuning |
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Problem with cleaning a carb , is that there can still be gunk now loosened up in the passages ready to avalanche loose to block up the passage or jetting.
To skip that problem we have a one gallon can of Berryman's to soak at least over night the carb. Then the next day use carb cleaner and pressurized air to clean it again. Repeat this twice more to make sure. _________________ In Stereo, Where Available! |
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Bobs67vwagen Samba Member
Joined: March 27, 2005 Posts: 287 Location: Eastern north carolina
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Posted: Sun Jun 22, 2025 5:12 pm Post subject: Re: 30 PICT 1 carb tuning |
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Another thing to check for is a worn throttle shaft bushing. With he engine idling carefully spray some carb cleaner on the throttle shaft to check for a vacuum leak as this will affect idle quality and is common on these 60 year old carbs. |
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OldmanVw Samba Member
Joined: November 24, 2004 Posts: 20 Location: Gig Harbor, WA
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Posted: Sun Jun 22, 2025 5:24 pm Post subject: Re: 30 PICT 1 carb tuning |
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Bobs67vwagen wrote: |
Another thing to check for is a worn throttle shaft bushing. With he engine idling carefully spray some carb cleaner on the throttle shaft to check for a vacuum leak as this will affect idle quality and is common on these 60 year old carbs. |
Will do. Also just noticed my accelerator pedal assembly is all bubble gum and baling wire at the floor. New pedal on order…the joys of a Vw…. _________________ Selling toys, books and other cool stuff
Wanting a 58 Beetle, Diamond Gray. Just like the one I sold in McDonough GA in 2001 |
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scarabee Samba Member
Joined: May 14, 2021 Posts: 155 Location: South Africa
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Posted: Mon Jun 23, 2025 2:48 am Post subject: Re: 30 PICT 1 carb tuning |
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I don't know if you mentioned this, but are the valve clearances within spec? |
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OldmanVw Samba Member
Joined: November 24, 2004 Posts: 20 Location: Gig Harbor, WA
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Posted: Mon Jun 23, 2025 5:46 am Post subject: Re: 30 PICT 1 carb tuning |
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scarabee wrote: |
I don't know if you mentioned this, but are the valve clearances within spec? |
Did not check, but now I am going to. In for a penny, in for a pound… _________________ Selling toys, books and other cool stuff
Wanting a 58 Beetle, Diamond Gray. Just like the one I sold in McDonough GA in 2001 |
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