Table of Contents

REF: Carburetor, Intake Manifold & Exhaust


Aftermarket Carburetors Installed on Sportsters 1957 - 2006


PERFORMANCE OPTIONS


Keihin BD (Screaming Eagle 40mm Kit)

Sub Documents

Aftermarket Carburetors and Upgrades


Mikuni Carbs

Sub Documents

HSR Series:

VM Series:

HS-40:

Solex:


Other than exact replacement OEM carburetors, all Mikuni aftermarket carburetors and tuning components are sold “As Is” for off road / racing use only. 1)
They are not intended or approved for use on vehicles operated on public roads or in locations where applicable engine tampering and anti-pollution laws apply.

Counterfeit Mikuni Alert!!:

There are plenty of Mikuni and Keihin carburetors in the market that are not authentic. 2)
They're not safe to use and will cause many problems to your bike.
If you're not sure if it's a genuine carburetor, the Sudco International site has a web page with pics of genuine and fake carbs.
Follow this link or you can call them directly to verify a seller. 3)

Click on the pic to enlarge.
4)

Mikuni vs CV-40:

Mikuni HSR42 on a relatively low powered bike:
Not a whole lot. Some, but not a lot.5)
Mikuni HSR42
Now let's bump the power up a little bit to see what Mikuni brings to
the party: Still not much. Course, this isn't a whole lot stronger bike. 6)
Mikuni HSR42
OK, now let's put it on a bit stronger bike:
Holy cow, made a pretty big difference at this power level. 7)
Mikuni HSR45
Now let's step it up some more: Shazam.
It's worth nearly 11hp on a 111hp bike! 8)

Video:

S&S Carbs

Sub Documents


S&S Super B Series

9) 10)

Throttle shaft leak repair.
Counter-bore each side a few thousandths less than the O-ring thickness so it sits a little proud. 11)
These are 1/4“ x 3/8” O-rings from a HF&T kit.
Then use a couple 1/4“ ID SS washers with a good synthetic grease like Super-Lube.
The return spring is on one side and you position the throttle lever on the other side.
So the washers just pinch the O-rings but still allow proper throttle movement. It should solve a shaft leak problem and can be easily maintained.
This was done on a milling machine with a mold ejection pin that fit perfectly.
To keep center, the pin was put in the spindle collet with an indicator as a confirmation of position after having moved the Z axis.
12) 13) 14)

S&S Super E Series

Accelerator Pump

There are 4 screws to take out to remove the float bowl.
Three obvious ones and the fourth one is one of the accelerator pump screws as in below.

Removing the accelerator pump.
The spring inside holds the diaphragm up until the rod pushes it down like a bellows.
15) 16)

Kmotor Super E (copy?)

This is some of the wording of the advertisement on Ebay. 17)

This carb is billed as “New 11-0420 Carburetor Super E Shorty Carburetor Big Twin or Sportster Carb”.
US $64.97/ea. “1 year warranty. This is a brand new, high quality direct fit OE style replacement part”.
The Super E are butterfly type carbs with fully adjustable idle mixture screws and changeable intermediate and main jets.
The idle mixture screw is positioned and angled for easy accessibility. Even with 5 gallon gas tanks, adjustments are not a problem.
The Super E has a 1-7/8in. (47.6mm) throat at the butterfly and is identified by an E cast into the throttle linkage side of the carb body.
All Super series carburetors use a special enrichment device instead of a choke for starting. This leaves the bore of the carburetor unobstructed for greater air flow.
The Super E enrichment device is activated by a variable position lever attached to the air cleaner backplate.
By simply adjusting the lever, starting and warm-ups are made easy and foolproof.


It's actually made by “Kmotor” out of China if you read the fine print on the bottom of the add.
But the wording in the add makes it sound like the S&S Super E. There is no data suggesting that this isn't a good carburetor.
It may actually be a cheaper alternative.
However, it is something to take into account if your intention is indeed to buy an S&S model.
Here is the carburetor:

Kmotor Super E next to a Keihin butterfly 18) No S&S markings 19)

S&S G, F and L Series

Sub Documents


Rivera SU Carbs

Sub Documents


1970s Era- Lake Injector

Sub Documents

* How to adjust the Lake Injector for all throttle positions


Bendix Stromberg Carburetor Identification

Dellorto

28)

29) 30) 31)

Buy Dellorto carbs and parts

Weber

The Weber is a very tunable carb for different motors with a nearly infinite set of jets, emulsion tubes, chokes, etc. 32)
The angled manifold that swings the carb towards the front of the bike, giving you leg room to tuck in behind the manifold / carb.

33)

34) 35)

36) 37) 38)


3)
Sudco International Corp. 2410 S. Sequoia Drive Compton, CA 90220 Tel.(310) 637-8330 • Fax (310) 637-8331
28)
photo by Yellowstone Kelley of the XLFORUM