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Idle speed
adjustment (carbed models)

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Topic: Idle speed adjustment (carbed models)  (Read
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Surly

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Posts: 1354
Loc: Piedmont
Triad, North Carolina

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it up!

Idle
speed adjustment (carbed models)

« on: Wednesday,
October 15, 2003, 09:33:48 AM »

Hi all. I've
wanted to post this info for some time now, and since
we've had a request by a new member, I dug out a spare
carb and snapped a few pics to illustrate the cold idle
speed adjustment procedure. This adjustment will correct
a high-idle condition at engine startup. (Hot idle speed
adjustment is performed afterward.) You do not
need to remove the carb (or any part of the carb) to
make this adjustment.

Pic 1 shows the back side
of a typical Samurai carb. The yellow circle shows a
mark on the cam lobe which should be aligned with
the center of the post beneath it. The red circle shows
the two holes which must be "pinned" together with a
nail or an allen wrench to make the adjustment.

Pic 2 shows where to position a large
flat-blade screwdriver. Simply lift the lower lobe until
the two holes align...

...and insert a pin to hold it
there.

Now move your screwdriver to this
position...

...and bend the tab
slightly upward. Move it a little bit at a
time, repeating the procedure as necessary until the
mark aligns with the post beneath it when the pin is
removed.

Now remove all your tools and start
your engine. Surprise!

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-Surly
Early

tippyzuk

Sr. Wheeler

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Posts: 528
Loc: Hayes, VA
(glouchester)

The
Slasher

Re:Idle
speed adjustment (carbed models)

« Reply #1 on:
Thursday, October 16, 2003, 10:36:51 AM »

awesome, those
instructions on the suzuki john thing confused me a
little without looking at a carb...but yours is
great...good work!

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Surly

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Triad, North Carolina

Getting
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Re:Idle
speed adjustment (carbed models)

« Reply #2 on: Monday,
October 20, 2003, 10:14:52 PM »

You're welcome!
Now here's a picture of the hot idle speed adjustment
screw, with a screwdriver in position. This screw is on
the side of the carb facing the passenger's side
fender:

I like to set my hot idle speed around
1200-1300 rpm. If I set it much lower, my engine will
occasionally die in traffic when I come to a sudden
stop. But it's really just a matter of personal
preference. HTH

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-Surly
Early

Surly

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Triad, North Carolina

Getting
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Re:Idle
speed adjustment (carbed models)

« Reply #3 on: Monday,
October 20, 2003, 10:28:33 PM »

One more carb
fact: if your idle speed mysteriously goes up and down
without any apparent cause, try disconnecting the
idle-up solenoid wire.  It's the green plug at the
front of the engine, just above the water
pump:

The idle-up solenoid is supposed to
make the engine rev when there's an electrical load on
the alternator. On some vehicles, the system becomes
intermittent and the idle speed will go up and down
(cycling) by itself. Disconnecting this plug will
disable the solenoid and solve the problem. Just be sure
to set your hot idle speed a bit high, and everything
should work fine.

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-Surly
Early

got_zuk

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Loc: hope
mills ,  NC

If it runs......... FIX
IT!!!!!!!!!!!!!!!!!!!!

Re:Idle
speed adjustment (carbed models)

« Reply #4 on:
Wednesday, October 22, 2003, 10:26:03 PM
»

O.K. i had a
problem at the spring zuwharrie, well maybe a week
before. I could start it and it would run fine but if I
put it in gear and tried to drive it would die. and it
also started burning real rich. I put davids carb on it
and it ran fine so I took it to zuwharrie and all I got
out of it was 3 hours!!
any help would be great!!

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I'd
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Jeep!!!

Surly

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Loc: Piedmont
Triad, North Carolina

Getting
it up!

Re:Idle
speed adjustment (carbed models)

« Reply #5 on:
Thursday, October 23, 2003, 07:41:05 AM »

What happened
to it after three hours... did David take it back?

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-Surly
Early

got_zuk

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Loc: hope
mills ,  NC

If it runs......... FIX
IT!!!!!!!!!!!!!!!!!!!!

Re:Idle
speed adjustment (carbed models)

« Reply #6 on:
Thursday, October 23, 2003, 07:51:55 AM »

it started doin
the same thing as my original carb.

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I'd
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Jeep!!!

Surly

I live here!

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Loc: Piedmont
Triad, North Carolina

Getting
it up!

Re:Idle
speed adjustment (carbed models)

« Reply #7 on:
Thursday, October 23, 2003, 08:26:13 AM »

Oh no... you
broke David's carb! (j/k) My guess would be either a bad O2 sensor
or a plugged exhaust. HTH

«
Last Edit: Thursday, October 23, 2003, 08:27:50
AM by Surly »

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got_zuk

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Posts: 297
Loc: hope
mills ,  NC

If it runs......... FIX
IT!!!!!!!!!!!!!!!!!!!!

Re:Idle
speed adjustment (carbed models)

« Reply #8 on:
Thursday, October 23, 2003, 01:45:23 PM »

thanks, I will
see what happens!

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Rather push a sammi than drive a
Jeep!!!

eruby

Stocker

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Posts: 4
Loc: greenville,
sc

Re:Idle
speed adjustment (carbed models)

« Reply #9 on: Monday,
December 01, 2003, 09:38:54 AM »

WOW, Great
information. I just found this board yesterday and read
this post. Surly, your pics are great and I made the fix
last nite. I have the Haynes book and a copy of the shop
manual and neither clearly indicated how to adjust the
cold idle. Thank you thank you thank you.

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steve_fisher

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Posts: 7
Loc: Southern
West Virginia (Beckley Area)

ORANGE
KRUSH

Re:
Idle speed adjustment (carbed models)

« Reply #10 on:
Sunday, May 23, 2004, 09:43:46 PM »

Just joined the
board.Heck I just joined the Sammi thing all together
today.I hate to be a copy cat but thankyou thank you
thank you.Great write up.

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do upholstery work for off road goodies.
WV #
(304)469-3431

brotherjack

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Loc: British
Columbia

87
Long Wheelbase - Canada, eh!

Re:
Idle speed adjustment (carbed models)

« Reply #11 on:
Friday, June 04, 2004, 02:20:35 PM »

The carb on my
Zuke looks similar to the one in the pictures (the two
inlets sticking out, and a few other similarities), but
I have a fast idle screw pointing out toward the drivers
side located on the linkage around back of the
carb.  I don't know if it's the stock carb or not,
but I got my zuke from a fellow who didn't do a whole
lot of upgrades that cost more than 1$, so I really
doubt he changed the carb out.  Mine's a Canadian
87 LWB for reference.

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Can
you buy that at Canadian
Tire?

dschwab9

Got Zuk!
Administrator

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Posts: 6857
Loc:
Jonesboro, GA

It's Alive!

Re:
Idle speed adjustment (carbed models)

« Reply #12 on:
Friday, June 04, 2004, 02:43:47 PM »

Mine has a
screw for the fast idle adjustment also

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If you don't have time to do it right,
How
will you ever find time to re-do it?

Surly

I live here!

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Loc: Piedmont
Triad, North Carolina

Getting
it up!

Re:
Idle speed adjustment (carbed models)

« Reply #13 on:
Saturday, June 05, 2004, 09:33:04 AM »

Quote
from: brotherjack on Friday, June 04, 2004, 02:20:35
PM

The carb on my Zuke looks similar to
the one in the pictures (the two inlets sticking out,
and a few other similarities), but I have a fast idle
screw pointing out toward the drivers side located on
the linkage around back of the carb... Mine's a Canadian
87 LWB for reference.

Does it look like
this?

That's an Aisin carb, which were used
on Canadian Zuks. American Zuks have Hitachi carbs. All
of the photos and instructions I posted are for Hitachi
carbs only. Sorry!

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Early

Surly

I live here!

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Posts: 1354
Loc: Piedmont
Triad, North Carolina

Getting
it up!

Re:
Idle speed adjustment (carbed models)

« Reply #14 on:
Saturday, June 05, 2004, 09:43:59 AM »

Here is some
text I "borrowed" from a related post on another BBS.
I'll re-post it here if it isn't against the
rules:

"That's an Aisin 2A carb. I couldn't find
any info on rebuilding them. The FSM is a good source,
but it must be the Canadian model FSM, all US models
came with Hitachi DFB306 carbs. Suzuki or any other
parts places I tried for that matter, can't get a
rebuild kit for the (Aisin) carb. Suzuki can special
order all of the little parts separately for a full
rebuild, but it will cost, and some of the stuff (I was
told) has to come from Japan."

Hope this
helps!

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-Surly
Early

modderkabouter

Wheeler

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Posts: 70
Loc: Zoersel,
Belgium

Re:
Idle speed adjustment (carbed models)

« Reply #15 on:
Saturday, June 05, 2004, 11:21:14 AM »

or else just go
to the junkyard with your adapter plate (between the
carb and the manifold), and go search for something that
fits..

examles:

Mitsubishi colt =>
Aisan I believe
Mazda 626 (the old ones) =>
Nikki
Rover Metro 1.3
Swift GS (but WITH MANIFOLD)
=> They run great, and have NO problems with stalling
on hills...
Pony should also work I
believe..

maybe some others?

I bought
a Colt carb last week, it costed me 50 euro, so it's
pretty cheap..

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modderkabouter

Wheeler

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Posts: 70
Loc: Zoersel,
Belgium

Re:
Idle speed adjustment (carbed models)

« Reply #16 on:
Saturday, June 05, 2004, 11:22:21 AM »

(this is: when
you have problems with your standard carb..
;-)

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brotherjack

Trail Leader

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Posts: 201
Loc: British
Columbia

87
Long Wheelbase - Canada, eh!

Re:
Idle speed adjustment (carbed models)

« Reply #17 on:
Sunday, June 06, 2004, 07:48:43 PM »

Quote
from: Surly on Saturday, June 05, 2004, 09:33:04
AM

That's an Aisin carb, which were
used on Canadian Zuks. American Zuks have Hitachi carbs.
All of the photos and instructions I posted are for
Hitachi carbs only. Sorry!

No apologies needed!  You
got me in the neighborhood to figure out what I needed
to adjust it, so it's all good.  A mechanic had
told me I needed a new carb.  But with your
directions to get me looking at it, and once I figured
out what was what, a couple turns of the fast idle
screw, and you'd think I put a new motor in my
Zuke.  The fast-idle was set for like
4,500RPM,  and it took about 20/30 minutes to warm
up to slow idle for some reason, (and the fast idle
screw was in so far that it never got down to a proper
slow idle anyway - tended to hang upwards of 1,800 RPM)
which of course made it prone to all sorts of ugly
behavior (gas blowback, flooding out while driving,
etc).   Now I have fast idle set around 1,000
and slow around 700 RPM, and it purrs like a kitten -
starts on the first push of the button from dead cold,
never floods, and almost doesn't white-smoke on startup
anymore.

Now, if I can just finish tracking
down all the wiring shorts, I'll feel about ready to get
more than 10km from home in this thing (grin).  (of
course, the pavement ends about 2km from home, so I can
still have some fun in the meantime .

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Can
you buy that at Canadian
Tire?

brotherjack

Trail Leader

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Posts: 201
Loc: British
Columbia

87
Long Wheelbase - Canada, eh!

Re:
Idle speed adjustment (carbed models)

« Reply #18 on:
Monday, June 07, 2004, 02:37:02 AM »

Quote
from: Surly on Saturday, June 05, 2004, 09:43:59
AM

Here is some text I "borrowed" from a
related post on another BBS. I'll re-post it here if it
isn't against the rules:

"That's an Aisin 2A
carb. I couldn't find any info on rebuilding them. The
FSM is a good source, but it must be the Canadian model
FSM, all US models came with Hitachi DFB306 carbs.
Suzuki or any other parts places I tried for that
matter, can't get a rebuild kit for the (Aisin) carb.
Suzuki can special order all of the little parts
separately for a full rebuild, but it will cost, and
some of the stuff (I was told) has to come from
Japan."

Hope this helps!

I found
this in my research - more than I wanted to know about
my carb (including sources for new ones and rebuild
kits).
http://moose.ca/~slowzuki/slowzuki/powertrain/Fuel/Aisin_Carb/aisin.htm

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Can
you buy that at Canadian
Tire?

mac

Locked Up

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Loc:
Statesville,NC.

Stock
But Locked

Re:
Idle speed adjustment (carbed models)

« Reply #19 on:
Wednesday, August 18, 2004, 09:21:48 AM »

Thanks to you.
I have been looking for the hot idle adjustment on that
rube goldburg carb cam for 2 years. I saw the screw you
pointed out but it looked like a screw that went in to
the casting so I didn't try it The only adjustments the
Haynes book I have talks about is the mixture and cold
idle adjustments.
Tnx. Mac

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Mac

Surly

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Triad, North Carolina

Getting
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Re:
Idle speed adjustment (carbed models)

« Reply #20 on:
Wednesday, August 18, 2004, 04:18:24 PM »

You're welcome!
I'm happy to help.

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-Surly
Early

lanford

Zuki Wannabe

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Posts: 37
Loc: Pipe
Creek, TX

Re:
Idle speed adjustment (carbed models)

« Reply #21 on:
Thursday, August 19, 2004, 04:06:31 PM »

I did the "hot
idle adjustment" and now it runs worse.  I can turn
the idle screws round and round but only after 8 or 9
turns does it make any difference in the idle
speed.  WHat next??

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B.
Lanford

dschwab9

Got Zuk!
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Loc:
Jonesboro, GA

It's Alive!

Re:
Idle speed adjustment (carbed models)

« Reply #22 on:
Thursday, August 19, 2004, 04:26:21 PM »

Sounds like you
may have a clogged idle jet causing a lean condition,
which will make it idle really high.

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If you don't have time to do it right,
How
will you ever find time to re-do it?

lanford

Zuki Wannabe

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Posts: 37
Loc: Pipe
Creek, TX

Re:
Idle speed adjustment (carbed models)

« Reply #23 on:
Friday, August 20, 2004, 09:59:16 AM »

There's
more.  It only has power at 4 -5,000 RPM.  And
it backfires frequently like its loading up.  Plus
I get to work smelling like exhaust.  Very rich
exhaust.
Everty once in a while, it really
opens up and runs awesome and I can cruise at 70 in
fifth gear.  Otherwise I'm struggling in 4th and my
mileage is lousy.  about 20 mpg.

ANy more
suggestions.  Any are greatly appreciated.
I'm a diesel guy and have lost my touch on gas
engines......

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B.
Lanford

Surly

I live here!

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Triad, North Carolina

Getting
it up!

Re:
Idle speed adjustment (carbed models)

« Reply #24 on:
Friday, August 20, 2004, 05:03:29 PM »

If your Zuk
backfires, you more than likely have an exhaust problem
or a cam-to-crank timing problem. But questions like
this actually belong in the "Tech" section of the BBS,
not the "How To" section. Not everybody even looks in
this section. If you want more responses to your tech
questions, post a new thread in the tech section, and
give us more details about how your engine is running.
If you only say "it runs worse", we really can't help
you much. We need to know if it idles too high, or low,
or cuts off, or won't start. It also helps us to know
what things you've already tried to remedy the problem.
The more you tell us, the more we can help
you!

«
Last Edit: Friday, August 20, 2004, 05:06:39 PM
by Surly »

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-Surly
Early

1.9TD_Zook

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Oak, MI

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hairdryer?

Re:
Idle speed adjustment (carbed models)

« Reply #25 on:
Tuesday, December 21, 2004, 06:18:30 PM »

I just wanted
to add something.  I recently purchased a Zook that
has major idle issues so I figured I'd give this fast
idle adjust a shot and well, now it won't run at
all!  I found the problem to be a faulty
choke!  Since the method described here relies on
the choke being in working condition to actually "set"
the upper quadrant in the correct position, ALWAYS check
the choke first before bending the
bracket!

Unfortunately, mine is beyond repair so
I swapped it with a Toyota Corolla Aisan, i.e. NO MORE
ECM!

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'87
Zook - SPOA w/31's - A work in progress - soon to be VW
1.9TD Powered!
'93 YJ - SPOA, Ford 8.8", 4.10's,
4.0L, 35" SSR's - FOR SALE $6500 OBO
'99 Grand Am -
TWEAKED OUT! a.k.a. 5.0L Eater!
<grin>

Surly

I live here!

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Posts: 1354
Loc: Piedmont
Triad, North Carolina

Getting
it up!

Re:
Idle speed adjustment (carbed models)

« Reply #26 on:
Wednesday, December 22, 2004, 07:55:08 AM
»

Actually, there
isn't much that can go wrong with the choke except a
spring coming unhooked, or the choke "pull-off" (a
vacuum operated device) going bad. Both of them are easy
fixes. But if your Toy carb runs well and you don't have
to pass a "visual" inspection to get your sticker (like
I do), then more power to you!

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-Surly
Early

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