Bendix-Zenith carbs??

All Shovelhead and other models topics
Post Reply
George Greer
Site sponsor
Site sponsor
Posts: 1677
Joined: Wed Mar 24, 2010 5:48 am
Bikes: 1942 WLA Type III
Hybrid WL/KH bobber project.
58 FL
Location: Markt Einersheim, Bayern
Has thanked: 612 times
Been thanked: 173 times
Contact:

Bendix-Zenith carbs??

#1

Post by George Greer »

Is it a old wives tale, or is it true that Bendix Zenith carburetors were fire hazards??

I have been searching for info about rebuilding and tuning these carbs and I have seen several post from various boards that some people say's that the carbs are basically a fire trap.........and to not mess / run these carbs.

Is that true???

Curious George



Andygears
Posts: 795
Joined: Tue Feb 05, 2013 12:25 am
Bikes: 1950 panhead, 1999 FLHTCI, 1987 FLHTC custom
Location: Daytona Beach
Has thanked: 114 times
Been thanked: 213 times

Re: Bendix-Zenith carbs??

#2

Post by Andygears »

Bendix carbs have a spring that has to be “flipped” into place when installing the float bowl, not doing so, the float sticks, overflowing accelerator pump. Any carb that leaks is a firetrap.

Andygears

RooDog
Site sponsor
Site sponsor
Posts: 1809
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 821 times
Been thanked: 694 times

Re: Bendix-Zenith carbs??

#3

Post by RooDog »

Good Lord, people will say just about anything.....
I scored a B/Z carb from eBay for less than $30, installed it on the bike just to see WTF and as a base line. Turned the switch on and was stroking it through just to find compression, and the dog gone thing started up and was running. I bought a few things to freshen it up including a factory rebuild kit with a PINK leather cup, use nothing else, new throttle bushings & seals were included in the kit too. Nobody ever mentions this, so listen up: The mid range jetting is important, forget about an adjustable main jet. The mid jet is the thin brass tube that screws in from the top. They come in three sizes, A,B & C. I wound up using the B in my 74" panny with wonderful results.
George, you might do well to replace the old Leaker Linkert, and try a B/Z. I would buy used rather than new, but then that is just me....
Take a look at this eBay carby: item number:264495318888

https://www.ebay.com/itm/Harley-Davidso ... 4495318888
Bendix Carby.JPG
The B/Z has an accelerator pump so most of the time the choke is not need even for a cold start....
....RooDog....
You do not have the required permissions to view the files attached to this post.

George Greer
Site sponsor
Site sponsor
Posts: 1677
Joined: Wed Mar 24, 2010 5:48 am
Bikes: 1942 WLA Type III
Hybrid WL/KH bobber project.
58 FL
Location: Markt Einersheim, Bayern
Has thanked: 612 times
Been thanked: 173 times
Contact:

Re: Bendix-Zenith carbs??

#4

Post by George Greer »

Fellas,

Thanks for the responses.

I have been reading up on these, and the ease of rebuilds, and parts are still readily available to make them like "new".

One thing that I read was that I could use my solid throttle cable, and won't have to change out my internals or mess with any cabling to get it to work.

I have on hand a Gary Bang intake manifold that has perfect o-ring seats, and Viton O-rings too boot. And also have a "pull" spiral for the handlebar and all I have to do is take off 2 screws and slide the push spiral off, and slide the push one on, install 2 screws, and done.

So, I am considering changing it all out. Just before weather goes to crap here in Germany, so I can be ready for spring.

I also want to remove the primary cover, and clutch basket to find out exactly where my oil seep is coming from. It looks like the seal, might or the clutch rod seal.

I would like to get all this done, so when spring does get here......its on!

Thanks again,

George

PS, I would like to add the carb that I did wind up buying is on its way to my sisters house in Georgia.

And, the other sites also mentioned getting a rebuild kit with the PINK, pump. Strange to me that someone would gripe about a carb then use it after getting it rebuilt.

FL54
Site sponsor
Site sponsor
Posts: 268
Joined: Wed Mar 19, 2014 3:00 pm
Bikes: 1948 FL
1963 BMW R50/2
1966 BMW R60/2
1967 FLH
1968 FLH
1969 FLH
1972 FLH
2009 FLTRSE3
Location: Central Oregon
Has thanked: 20 times
Been thanked: 27 times

Re: Bendix-Zenith carbs??

#5

Post by FL54 »

Have Bendix carbs on two shovels and never have had a problem. Simple, easy to work on.

RooDog
Site sponsor
Site sponsor
Posts: 1809
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 821 times
Been thanked: 694 times

Re: Bendix-Zenith carbs??

#6

Post by RooDog »

In my opinion the only sore point with the B/Z carb is the design of the main jet. It is physically long, and expensive, and is also a bit tricky to remove because of its captured O ring. It also does double duty of attaching the float bowl. Personally, the one, and the only one, B/Z I have experience with worked out just fine for me on my Panny....
.....RooDog....

Andygears
Posts: 795
Joined: Tue Feb 05, 2013 12:25 am
Bikes: 1950 panhead, 1999 FLHTCI, 1987 FLHTC custom
Location: Daytona Beach
Has thanked: 114 times
Been thanked: 213 times

Re: Bendix-Zenith carbs??

#7

Post by Andygears »

George, I like Roodogs inlet fitting, I have seen many varieties that were less than perfect pushing the hose against the cylinder, not a good idea.

Andygears

Bone Head
Posts: 66
Joined: Wed Jul 31, 2019 5:27 pm
Bikes: 1956 Frankenstein
1998 Harley FXDL
Location: SW Ohio
Has thanked: 203 times
Been thanked: 40 times

Re: Bendix-Zenith carbs??

#8

Post by Bone Head »

They're good carbs, my pan's had one for eons. A few points...
That "pink" accelerator pump is part of the genuine Bendix rebuild kit. I've had my best results with that one. The others are junk.
Look at the bore where that pump fits. If it appears to be a bit rough you can polish it a bit. Cut a slot lengthways in a pencil and put a length of emery cloth in it. Insert into the bore and DO NOT USE A DRILL to rotate it. Use your fingers and take your time. A bit of vaseline on the main jet o-ring will ease installation and insure no damage to it.

http://zenithcarb.co.uk/

Good info in the above link.

RooDog
Site sponsor
Site sponsor
Posts: 1809
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 821 times
Been thanked: 694 times

Re: Bendix-Zenith carbs??

#9

Post by RooDog »

http://zenithcarb.co.uk/

Good info in the above link.
[/quote]

I fail to find anything here for the Harley carb, what am I missing?

Here is a PDF from the USA Zenith Fule System web site:

http://zenithfuelsystems.com/documents/ ... RS2009.pdf

But this concerns mainly Evo & Twinkies, one has to scour the interweb for good applicable info for a Panhead. But the B/Z is a simple carb and most all tuning tricks for an $&$ E model apply to it too....
....RooDog....

Bone Head
Posts: 66
Joined: Wed Jul 31, 2019 5:27 pm
Bikes: 1956 Frankenstein
1998 Harley FXDL
Location: SW Ohio
Has thanked: 203 times
Been thanked: 40 times

Re: Bendix-Zenith carbs??

#10

Post by Bone Head »

RooDog wrote:
Mon Oct 28, 2019 6:53 pm
http://zenithcarb.co.uk/

Good info in the above link.

I fail to find anything here for the Harley carb, what am I missing?

Here is a PDF from the USA Zenith Fule System web site:

http://zenithfuelsystems.com/documents/ ... RS2009.pdf

But this concerns mainly Evo & Twinkies, one has to scour the interweb for good applicable info for a Panhead. But the B/Z is a simple carb and most all tuning tricks for an $&$ E model apply to it too....
....RooDog....
Try searching by the carb's part number maybe? I think that's how I found the p/n of the rebuild kit for mine. I tried the link you posted, got nothing.

panhead
Site Admin
Posts: 2804
Joined: Wed Dec 12, 2001 9:17 pm
Bikes: 1954 FL
Location: Holland
Has thanked: 31 times
Been thanked: 202 times

Re: Bendix-Zenith carbs??

#11

Post by panhead »

Go to 'Topic list' in the menu, choose 'Carburetor/fuel system' and click on 'B'. You'll see Bendix information.

RooDog
Site sponsor
Site sponsor
Posts: 1809
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 821 times
Been thanked: 694 times

#12

Post by RooDog »

OK, Fellas...
Click on this link, it seems to be connecting now....
Best of luck....
....RooDog....


http://zenithfuelsystems.com/documents/ ... RS2009.pdf

George Greer
Site sponsor
Site sponsor
Posts: 1677
Joined: Wed Mar 24, 2010 5:48 am
Bikes: 1942 WLA Type III
Hybrid WL/KH bobber project.
58 FL
Location: Markt Einersheim, Bayern
Has thanked: 612 times
Been thanked: 173 times
Contact:

Re: Bendix-Zenith carbs??

#13

Post by George Greer »

RD, got any info on the choke set-up ya got there?

I just got the carb that I have just acquired tore down and in the rebuild stage......it looks good and I have just got in the rebuild kit, one with the Pink plunger...

Now.......the question is.........what are you guys using to keep the leather pliable? I have been looking over different sites, and some has suggested soaking it prior to installation in weapons oil or sewing machine oil...........

What's the general rule?

Also, the carb is one of the ones with a adjustable main jet....

So letting it soak in the parts cleaner for the weekend, then on to clean it up, inspect all the component parts and reassemble..

Thanks for any advice and suggestions.

George

George Greer
Site sponsor
Site sponsor
Posts: 1677
Joined: Wed Mar 24, 2010 5:48 am
Bikes: 1942 WLA Type III
Hybrid WL/KH bobber project.
58 FL
Location: Markt Einersheim, Bayern
Has thanked: 612 times
Been thanked: 173 times
Contact:

Re: Bendix-Zenith carbs??

#14

Post by George Greer »

To follow up........

The pump is the one with the pink leather............However..

It, as well as the original one that came out when disassembled does not have three holes in the stem......just one.

Where would someone be able to find a stem with the three holes, and a float bowl with the drain plug in it??

Spent a good part of the morning looking for just those two items..

Ain't gonna hurt me if I don't ever find it, but.......still Ima gonna look..lol.

George

RooDog
Site sponsor
Site sponsor
Posts: 1809
Joined: Tue Oct 31, 2017 1:00 pm
Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Custom Built Evo 100" Bagger
Location: Knoxville, Tennessee
Has thanked: 821 times
Been thanked: 694 times

Re: Bendix-Zenith carbs??

#15

Post by RooDog »

G...
I paid over $40 to be sure I got a kit with the Pink cup and didn't pay any attention to the number of holes, just put it all together, including the throttle shaft bushing/ seals. You can always drill some holes.
The leather cup lives in gasoline, so it seems to me whatever you soak it in will eventually be washed out by the fuel, so what would be the point? You can always pean back the rubber boot and squirt a little oil or WD 40 on top of the cup if that allows you to sleep at night.....

Adjustable Main Jet? Again, what's the point? The main jet only comes into play at high, engine, speed, Witness the fact than an S&S Shorty will run just fine up to about 4000 RPM with the MJ completely removed. Now, pay attention here, with the AMJ you loose the idle jet tube, the long thin tube that screws down through the carb where the AMJ adjusting screw now lives. That idle jet tube, actually controls the intermediate circuit, has metering holes and comes in three sizes marked A, B, & C, lean to rich. This is what controls the fuel flow 90% of the time, slow, just off idle, to mid range. I had to upgrade mine from A to B to tune out a 40 MPH stumble the carby was showing me. With the AMJ you no longer have this tuning feature.
Read and follow S&S's tuning guide for their E carb, it applies to the Bendix too.
Now, some will tell you the AMJ is the greatest thing since bratwurst, and I'll not argue the point, I am just relating what I learned with my $27 eBay Bendix, + a lot of repair and reconditioning bits & pieces.

I wish I had a float bowl with a factory drain plug. couldn't locate one, so I drilled and tapped the boss and installed an 1/8 NPT pipe plug, a simple hand, or drill press project. I still have my eye out at the local swap meets for a factory bowl, I just don't want to pay more than the price of a beer, or two, for one, being the cheap a$$ that I am....
One other note on the Bendix: Be very careful when installing the bowl to be sure the float spring is not trapped between the bowl and the gasket.....
Accelerator Pump.jpg
Be sure to LockTite this screw in place. I uses a slightly longer Allen Head screw to be sure it stays in place. Don't ask how I know how important this is....
....RooDog....

PS: I think you will enjoy that Bendix over the Linkert..... Best Wishes....
You do not have the required permissions to view the files attached to this post.

Post Reply

Return to “Shovelhead”