Honda
DOHC Four
Parts
I
am pleased to offer products for '79-'83 Honda DOHC-4s.
Largely
overlooked by serious collectors (until now), these bikes offer
a terrific combination of performance, comfort, reliability
and sporting capability. The '83 CB1100F is one of my favorite
bikes. In fact, I'm searching for a good one now!
More
cool stuff: click
here
Testimonials:
click
here
Randakk's
Own DOHC
Four
Master Carb Overhaul Kit
WORLD'S
BEST DOHC
FOUR KIT!
Now
available in a "combo" with Mike Nixon's brilliant booklet,
Cleaning the Honda HOHC Four Carburetor!

Beautifully
Restored CB750 DOHC Carbs by Mike Nixon using Randakk's Master
Carb Kit
Here's another Randakk exclusive item designed to help you put
your DOHC Four carbs in top
working order. My DOHC
Four Master Carb Overhaul Kit includes
everything you need (and nothing you don't need!) for a comprehensive
DOHC
Four carb overhaul.
Recent
Testimonial:
"Randall,
I've received and installed the DOHC-4 Master Carb Kit. It actually
arrived Monday!! Given the holiday, I was very surprised. Everything
went together without a hitch. I have a couple other items to
address before firing the bike up, but wanted to let you know
the kit was perfect. The bike (1980 CB750C) had been sitting in
a barn for 10 years and a field for 10 years before tha, so all
the o-rings and such were hard and nasty. Your kit was just the
ticket."
"Well,
I'm fully back on the road now and I'm still impressed with the
kit. I've got about 250 miles on it since installing your DOHC-4
Master Carb Kit. No crazy leaks or anything and the carbs work
as good as they did from the factory I'm sure."
----Stan
Blosser - Coopersville, MI
More
Testimonials here
The
architecture of these carbs is very similar to the GL1100, CBX
and CX-500 carbs that I have been supporting with my proprietary
Master Kits for quite some time. After fielding
numerous requests, I've decided to extend my coverage to these
models.
This
kit is proprietary to Randakk's...you won't find this available
anywhere else at any price. I sourced the best available parts
from 3 continents and combined them in a unique combination that
represents real value. This kit is appropriate for listed 1979
- 1983 DOHC Fours with original
carbs.
And
unlike other kits on the market, my kit even includes those pesky
carburetor body side-to-side sealing o-rings that seem to give
so much trouble on units that have been parked for awhile (details
below).
Note:
The round o-rings in each of my Master Kits are made of Viton
rather than ordinary nitrile (Buna-N) as found in other aftermarket
carb kits. Viton is superior to nitrile in terms of:
- Heat
tolerance (400 degrees F vs. 250 degrees F)
- Compression
set
- Permeation
Most
people are not aware that one good case of severe engine overheating
can ruin the carb o-rings found in ordinary kits. My o-rings are
the best available! Viton Proof here.
Also,
my o-ring sizes are quite precise. They are equivalent to the
exact sizes specified by Honda for each fitment. Not "close-enough"
sizes as in many of the other aftermarket kits I've evaluated.

Contents
of Randakk's DOHC
Four
Master Carb Overhaul Kit
Unlike
ordinary aftermarket kits, each Randakk kit provides everything
listed for all 4carbs + other items required for splitting and
re-joining the carbs to replace the cross carb fuel transfer tubes
as. I even include rebuild kits for the air cut-off valves and
accelerator valve.
Only the highest quality items are included. This kit has been
thoroughly tested. This collection represents the best value available
in the market. Trust me, you will need everything in this kit
to do a proper overhaul of your carbs.
Here's
what you get:
O-rings:
- 4
- fuel (idle) mixture screw (2.8 x 1.1 mm)
- 4
- float bowl drain screw (4.2 x 1.3 mm)
-
4 - CV Slide Top Limit Plug (6.9 x 1.3 mm)
- 1
- Carb #3 accelerator pump passage at float bowl (5.0 x 1.3
mm).
- 6
- Main Fuel Transfer Tubes (5.8 x 2.0 mm)
- 6
- Accelerator Fuel Transfer Tubes (3.8 x 2.0 mm)
Gaskets
- 4 of each:
- Randakk's
exclusive improved float bowl gaskets.
- Slightly
thicker cross section for positive sealing
- made
from high tech material to resist problems associated
with oxygenated fuels
Miscellaneous
Parts:
- 4
Air Cutoff Valve Overhaul Kits
-
1 Accelerator Pump Overhaul Kit
- 4
idle mixture screw washers
- 12
float bowl screws (4 x 16 mm)
- 1
mm cotter pin for accelerator pump linkage - 1 supplied (simple
item, but hard to find elsewhere)
- 4
rubber blanking plugs - cover access to idle fuel jet
- 8
high quality, plated M3 x 6mm (0.5 pitch) panhead screws for
securing choke butterfiles
Special
Bonus:
Through
an exclusive arrangement, my DOHC-4
Master Carb Overhaul Kit
is available in a combination with Mike Nixon's brilliant booklet,
Cleaning the Honda HOHC Four Carburetor. This
37 page booklet is a must read! Much better explanation and
photos than the official Honda Workshop Manual. 140 sharp photos
and illustrations! Trust me, you'll be very glad you have this
gem. The retail value (with shipping) for this wonderful booklet
is $34.75
This
booklet alone and other neat Instructional Guides by Mike
Nixon are available here at Mike's Book
Nook!
I
also recommend that you refer to the official Honda Factory Workshop
Manual. There is some critical information there on re-joining
and aligning the carb bodies to prevent binding of the throttle
and choke shafts...very important!
My
Master Kit includes all the o-rings needed for renewing the fuel
transfer tubes (main and accelerator).
I
also include 8 high quality, plated M3 x 6mm (0.5 pitch) panhead
screws for securing the choke butterfiles. The choke butterflies
must be removed during disassembly of CBX carbs to renew the side-to-side
transfer o-rings. The staked OEM choke butterfly
screws are very difficult to re-use. You will need to use some
medium strength Lock-Tite to secure my screws.
Note:
No jets or jet needles are supplied with my kits. My experience
is that these can normally be cleaned and re-used. Aftermarket
needles are not sized as accurately as the OEM needles and may
introduce lean / rich problems where none existed. Unless your
needles are worn or bent, I recommend re-using them. If you try
to buy jet needles from Honda, you'll discover that they are only
available as a set which includes the CV slide, cap and jet needle.
The price will make you faint! If you need jets, buy aftermarket
kits such as those from K&L or spring for the genuine Honda
bits.
Also,
there are no float valve/seat assemblies in my kit. Many aftermarket
rebuild kits include float valve/seat assemblies of dubious quality.
In the past, there have been many problems with these aftermarket
items. Most of the problems related to the aftermarket float needles
being incorrectly sized (too short) resulting in unreliable (or
nonexistent) fuel shutoff. Some are OK. I've not included them
in this kit, because the rubber tips and seats on the OEM item
will last nearly forever and can usually be cleaned and reused.
If you decide to reuse your existing float assemblies, be sure
to remove and clean the small fuel strainer beneath the float
seat!
So,
I've left float valve/seat assemblies out of my kit to keep the
cost down and give you a choice on what to buy if you think new
ones are needed.
If
you need new float valve/seat assemblies, you can buy the OEM
item and not have a worry. This way you'll also get new fuel inlet
screens (the plastic strainers installed below each float valve).
You will need to order 4 of these. Or, take a slight gamble and
go with aftermarket float valve/seat assemblies which are available
at reasonable cost from numerous suppliers.
My
DOHC
Four Master Kit includes 62 total
pieces (I count each air cutoff overhaul kit and accelerator
pump kit as only "1" piece each in my total count even though
each actually has a diaphragm, spring, seal, boot, etc.).
Considerable
skill is required to install this high quality kit correctly.
Since I can't control this important variable, there is no warranty
on these. Rest assured that they are of the highest quality materials
and workmanship. Each kit has been carefully packed and inspected
to ensure that all items are included.
Warning:
Please open the package very
carefully when it arrives. Many of the parts are very small so
take appropriate precautions. If you chose to open the package
in the dark over your gravel driveway, after 1 or 12 beers, please
don't later complain that you are a "few o-rings short." Seriously,
do be careful when you open the package!
Not
sure can handle your own rebuild? For information on Randakk's
Approved Honda Carb Rebuilder Program
click
here
DOHC
Four
Model Identification
|
Randakk
DOHC
Four Master Kit Version
|
Fitment
Chart
Summary
of Models Covered
|
|
A
|
CB
750 K (79)
CB
750 F Supersport (79)
CB
750 L LTD (79)
A
Version Available Now!
|
|
B
|
CB
750 C Custom (80-82)
CB
750 F Supersport (80-82)
CB
750 K (80-82)
CB
750 SC NightHawk (82-83)
CB
900 C Custom (80-82)
B
Version Available Now!
|
|
C
|
CB
900 F Supersport (81-82)
C
Version Available Now!
|
|
D
|
CB
1000 C Custom (83)
CB
1100 F (83)
D
Version Available Now!
|
Note:
The contents of each DOHC
Four Master Kit is identical except
for variations on the Accelerator Pump and Air Cutoff Valves.
DOHC
Four
Master Carb Overhaul Kit
International
orders: Read this and
please contact me before placing an order! I
will send special ordering instructions. PayPal "Add Item
to Cart" buttons are for domestic United States of America
customers only.
For
Versions With Mike Nixon's Booklet:
|
|
DOHC
Four
Master Carb Overhaul Kit - Version A
(see Fitment Chart above)
"COMBO"
WITH Mike Nixon's Cleaning the Honda DOHC
Four Carburetor Booklet (37 pages)...Highly Recommended!
Price:
$194.70
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
DOHC
Four
Master Carb Overhaul Kit - Version B
(see Fitment Chart above)
"COMBO"
WITH Mike Nixon's Cleaning the Honda DOHC
Four Carburetor Booklet (37 pages)...Highly Recommended!
Price:
$194.70
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
OHC
Four
Master Carb Overhaul Kit - Version C
(see Fitment Chart above)
"COMBO"
WITH Mike Nixon's Cleaning the Honda DOHC
Four Carburetor Booklet (37 pages)...Highly Recommended!
Price:
$194.70
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
DOHC
Four
Master Carb Overhaul Kit - Version D
(see Fitment Chart above)
"COMBO"
WITH Mike Nixon's Cleaning the Honda DOHC
Four Carburetor Booklet (37 pages)...Highly Recommended!
Price:
$194.70
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
For
Versions Without Mike Nixon's Booklet:
|
|
DOHC
Four
Master Carb Overhaul Kit - Version A
(see Fitment Chart above)
WITHOUT
Mike Nixon's Cleaning the Honda DOHC Four
Carburetor Booklet (Master DOHC
Four Carb Overhaul Kit alone...no
Nixon Booklet)
Price:
$159.95
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
DOHC
Four
Master Carb Overhaul Kit - Version B
(see Fitment Chart above)
WITHOUT
Mike Nixon's Cleaning the Honda DOHC Four
Carburetor Booklet (Master DOHC
Four Carb Overhaul Kit alone...no
Nixon Booklet)
Price:
$159.95
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
OHC
Four
Master Carb Overhaul Kit - Version C
(see Fitment Chart above)
WITHOUT
Mike Nixon's Cleaning the Honda DOHC Four
Carburetor Booklet (Master DOHC
Four Carb Overhaul Kit alone...no
Nixon Booklet)
Price:
$159.95
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
|
DOHC
Four
Master Carb Overhaul Kit - Version D
(see Fitment Chart above)
WITHOUT
Mike Nixon's Cleaning the Honda DOHC Four
Carburetor Booklet (Master DOHC
Four Carb Overhaul Kit alone...no
Nixon Booklet)
Price:
$159.95
each including US domestic shipping and handling.
I
usually ship within 48 hours of receiving your order.
|
International
orders: Read this and
please contact me before placing an order! I
will send special ordering instructions. PayPal "Add Item
to Cart" buttons are for domestic United States of America
customers only.
^top^
Randakk's
DOHC
Four Float
Bowl Gasket Set
(included in DOHC
Four
Master Kit)

DOHC
Four
Float Bowl Gaskets - Set of 4
High
quality DOHC
Four Float Bowl Gasket Set. Randakk's
exclusive improved design.
Note:
I'm selling these in a set of 4 gaskets.
Price:
$26.50 per set of 4 including US domestic shipping and
handling.
International
orders: Read this and
please contact me before placing an order! I
will send special ordering instructions. PayPal "Add Item
to Cart" buttons are for domestic United States of America
customers only.

I
usually ship within 48 hours of receiving your order.
^top^
For
more information on the use of material from this website, click
here.
Randakk's
DOHC
Four
Float Pivot Pins
(NOT included in DOHC
Four
Master Kit)
RANDAKK
EXCLUSIVE!!! IMPOSSIBLE TO FIND ANYWHERE ELSE, FROM ANYBODY, AT
ANY PRICE UNTIL NOW...THESE ARE NEW!
Up
until now, float pins have been available only from Honda as part
of a "Float Set" which includes the float. The Honda part number
for the CBX float set is: 16013-679-005
which currently lists for $41.10 each. So, to get 6 float pins,
you would have to spend $246.60 at full retail!
DOHC
Four
Float Pivot Pins -
Set of 4
Float
pins can be a bear to remove. Often they are bent or damaged in
the process. Worse, ham-fisted removal efforts unfortunately can
result in broken float pivot posts which ruins the whole carb
body. Be careful removing these! Liberal and patient soaking with
PB Blaster or equivalent is advised before you attempt
removal.
Randakk's
float pins are designed specifically for the Honda DOHC
Four. They are made from from precision
machined stainless steel stock to precise dimensions. They are
cut to length to very close tolerances and the ends are finished
just like OEM.
Be
sure to de-burr the float pivot post bores on the carb body before
installing these. Make sure the corresponding bores in the floats
themselves are free of burrs as well. The float must
pivot freely when installed for proper operation.
DOHC
Four
Float Pivot Pins
Note:
I'm selling these only in a set of 4 float pins.
Price:
$19.00 per set of 4 including US domestic shipping and
handling.
International
orders: Read this and
please contact me before placing an order! I
will send special ordering instructions. PayPal "Add Item
to Cart" buttons are for domestic United States of America
customers only.

I
usually ship within 48 hours of receiving your order.
^top^
For
more information on the use of material from this website, click
here.