Shade Tree Solution part deux (Dual carb)

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HOTT
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Shade Tree Solution part deux (Dual carb)

#1

Post by HOTT »

A while back a member here asked if I could help him with a carb set-up.
His bike is an awesome sport mod that just didn't allow for a central carb.
This set-up will use 2 Weber 34 ICT 1bbl carburetors.
Note;to me this is the fun part of these bikes, (that is, looking at the possibilities)
I make no claims of better or worse. Just what can be. Why?... Because we can.
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Start with 1.63" water jet exhaust flanges. "but the holes won't line up..'' yes you are
correct. I chose to weld up the holes and redrill. How much? Dunno. I used the originals
as a guide. Easier than measuring (for me). note; flanges are cut +.030" to allow tubing to slip thru
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With the flanges ready we can start piecing the tubing. We won't be using old exhaust pipe
today. Fresh 16ga. mild steel. Cut at 45's. A band saw makes for good cuts. Did I mention an old bent valve head makes for a great jig?) Make several good tacks around the joints. The trick will be to weld it up and still have it slip in and out of the mounting flanges. Why? Keep reading..
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I clamped some tube and made a pass with the hole saw. This will be the riser for the carb mount.
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tip; weld this riser to the carb mounting flange before fitting to the connecting tubing.
As neat as it was with square corners, we can improve things greatly by just knocking off the corners. Cutting corners? There is a joke in there someplace...
You can see why it's best to have the flanges separate for a few more steps. Easier to get into
corners and less chance of the mounting flanges coming up uneven.
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Intermission
Coming up; Gaskets and the amazing world of linkages
If we can't fix it, we can fix it so no one else can.
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Re: Shade Tree Solution part deux (Dual carb)

#2

Post by Rat »

LOOKS easy .......

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Re: Shade Tree Solution part deux (Dual carb)

#3

Post by HOTT »

well a break did me good...So were was I..
From here you can see the underside of the carb mounting flange. As covered in the original
thriller, Shade Tree Single Solution, weld flange first then weld inside the riser followed by a pass with the hole saw to open the throat of the intake. As for the head mounts, I welded the seal from the bottom and leveled with a belt sander.
(Why not weld around the top?) 'cause it looks good.
(Would you do it again?) [shrugs shoulders] probably not.
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I cut the gaskets from some of Auto Zone's best.
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The linkage starts with the cable stop.
This is a pull only set-up repeat these steps
to the left side carb if a push/pull throttle is desired

Using 1" flat stock, drill a 3/8'' hole with a cut slot. A slight bend that will give the most
direct cable movement. It looks like this....
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The pull throttle arm looks like this, again using the hole with a cut slot to retain the cable.
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Note the cable pulls straight with no rubbing on adjuster tube.
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Mandatory 5 photo break
Last edited by HOTT on Sun May 26, 2013 5:27 pm, edited 1 time in total.
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Re: Shade Tree Solution part deux (Dual carb)

#4

Post by robin1731 »

In the last pic, I see the cable is mounted fairly close to the pivot point. How is the pull on the throttle? Light, heavy, good? Also, if you've had the bike running and ridden it, how is throttle response? Is it abrupt or is it nice and linear?
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Re: Shade Tree Solution part deux (Dual carb)

#5

Post by JBz »

Cool Mon. Looks like dual accelrator pumps one on each . It will probably fly................... jb
jbz........... Thinkin about sh-t too hard and You wont get anything done
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Re: Shade Tree Solution part deux (Dual carb)

#6

Post by HOTT »

robin1731 wrote:In the last pic, I see the cable is mounted fairly close to the pivot point. How is the pull on the throttle? Light, heavy, good? Also, if you've had the bike running and ridden it, how is throttle response? Is it abrupt or is it nice and linear?
Keen eye Robin. Yes it looks very close to compared to a 1000 or 1100 pulley. It's just a touch closer than a 1200 pulley.
Easy component to change if necessary.
The feel is like that of a new medium displacement bike. I'd say good.
I even tried it with just one carb spring. That felt like a dirt bike throttle.
The twist rotation is (counter clockwise) 12 to 8.
I don't have any performance figures that is up to the end user,
but I suspect with the right jets & pipes...Abrupt :twisted:
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Looks like dual accelrator pumps one on each
Abrupt :twisted:
Just a quick look at the downstream hook up.
I cut this arm on a curve to prevent the chance of a WFO bind up.
Same center to center of course.
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Re: Shade Tree Solution part deux (Dual carb)

#7

Post by KYpondman »

Anxiously awaiting test results.
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Re: Shade Tree Solution part deux (Dual carb)

#8

Post by sunnbobb »

My, nice work old man. I thought the same as Robin, but also realize having the pivot point lower should give you awesome throttle on. More, please.
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Re: Shade Tree Solution part deux (Dual carb)

#9

Post by robin1731 »

sunnbobb wrote:My, nice work old man. I thought the same as Robin, but also realize having the pivot point lower should give you awesome throttle on. More, please.
It will but it may be too responsive on the street. Much like the 1/4 turn throttles I use on race bikes. On the street they can be a bit of a pain. Hit a bump and your hand moves just a little but the throttle moves enough to change speed. Up or down. Same bump on a stock throttle and you never know it.
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
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Re: Shade Tree Solution part deux (Dual carb)

#10

Post by joedrum »

looking good hott ,,,fab work is top level .....
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Re: Shade Tree Solution part deux (Dual carb)

#11

Post by TDIJ »

Any feedback on this carb setup? How is it working for this guy? I am unable to run a central carb on mine due to other things wanting that space. This is a carb set-up I have been thinking about but seems to be little info out there... everyone is all worked up about the IDFs.
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Re: Shade Tree Solution part deux (Dual carb)

#12

Post by HOTT »

TDIJ wrote:Any feedback on this carb setup? How is it working for this guy? I am unable to run a central carb on mine due to other things wanting that space. This is a carb set-up I have been thinking about but seems to be little info out there... everyone is all worked up about the IDFs.
I will have to check in.
When last we spoke, he was coming down on the jetting and looking into
eliminating the points (weak spark) for ECI.
If we can't fix it, we can fix it so no one else can.
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Re: Shade Tree Solution part deux (Dual carb)

#13

Post by ericheath »

Ahhhem, clearing throat.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
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Re: Shade Tree Solution part deux (Dual carb)

#14

Post by Whiskerfish »

ericheath wrote:Ahhhem, clearing throat.


lolol lolol lolol lolol lolol
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Re: Shade Tree Solution part deux (Dual carb)

#15

Post by HOTT »

ericheath wrote:Ahhhem, clearing throat.
..you swallow a bug ? :lol:

He sez "they are amazing". Quick starts. Solid idle.
He's only made one jet change. Thinks maybe one more (jet)
change for redline, but not before ignition change.

The bike has been in service for some time.
He is currently replacing driveshaft...Oops. :roll:

Sorry for the delay.


HOTT
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