1980 KZ440 B carb question

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11 Dec 2011 12:50 #492652 by Mainerider
1980 KZ440 B carb question was created by Mainerider
Hello Folks,

A new member. I just added this bike to my stable as a get me the through the boring winter project and it's partially a "bike-in-a-box". Quick question; I searched but couldn't pin down what carbs came stock on this bike. The box has a set of Mikunis but the PO wasn't sure if these were the OEMs or not. I do all of my own work and I know how tight the fit is for the carb racks but these Mikunis seem simply too wide front to back to fit betwwen the airbox boots and the intake boots. Anyone know if the OEMs are Keihins or Mikunis? Thanks.

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C

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11 Dec 2011 17:04 #492666 by Patton
Replied by Patton on topic 1980 KZ440 B carb question
Courtesy of wiredgeorge, 13-5-2005:

Hmmm I was thinking that these 440s used Keihin CVs... didn't notice the initial comments. I am not sure I can recall seeing a 440 with Mikuni carbs. They may...
Essentially, the same Keihin carb(s) are used in the KZ250 (single), KZ305, KZ440, mid-80s 700 LTD, and many of the 4 cylinder 750 models from 1980-1983. These are harder to find parts for. No pilot jets that I can find and the primary main jets are real hard to find as well. The secondary main jets which are usually called just main jets in other Keihin carbs, are the same as those carbs and these are easy to get.


Good Fortune! :)

1973 Z1
KZ900 LTD

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11 Dec 2011 23:56 #492716 by Mainerider
Replied by Mainerider on topic 1980 KZ440 B carb question
Thanks for the info; I suspected the Mikunis weren't stock. Well, I've been down this road many times before so let the fun begin. Old bikes, the gift that just keeps on giving...

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C

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12 Dec 2011 16:20 #492820 by Mainerider
Replied by Mainerider on topic 1980 KZ440 B carb question
One final, related question please...do the manifold carb boots from the various 400/440 models interchange? I could use a new pair and I've located a set from a 76 400.I "think" the 400/440 heads are spaced the same? Same size carb spigots? Thanks for any help.

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C

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12 Dec 2011 16:26 - 12 Dec 2011 21:49 #492824 by Mainerider
Replied by Mainerider on topic 1980 KZ440 B carb question
Sorry for the double post: My BlackBerry apparently stuttered...


[The duplicate post has been deleted.] :)

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C
Last edit: 12 Dec 2011 21:49 by Patton.

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12 Dec 2011 16:34 #492825 by mwriders
Replied by mwriders on topic 1980 KZ440 B carb question

Mainerider wrote: Hello Folks,

A new member. I just added this bike to my stable as a get me the through the boring winter project and it's partially a "bike-in-a-box". Quick question; I searched but couldn't pin down what carbs came stock on this bike. The box has a set of Mikunis but the PO wasn't sure if these were the OEMs or not. I do all of my own work and I know how tight the fit is for the carb racks but these Mikunis seem simply too wide front to back to fit betwwen the airbox boots and the intake boots. Anyone know if the OEMs are Keihins or Mikunis? Thanks.


My 1980 KZ440B1 came with 36mm Keihins. Although, they also came to me in a box. Still, I think those were the OEM items.

1980 Kawasaki KZ440B (brand new eBaby)
1998 Ducati 900S (gone)
1978 BMW R100S (gone, damn it)
1975 Yamaha RD350 cafe (gone)
1986 Yamaha XJ650 Seca (gone)
1981 Kawasaki KZ440LTD (gone)
1969 HD Sportster (gone :)
1966 Honda CB160 (gone, damn it)
1965 Suzuki 80

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13 Dec 2011 00:16 #492887 by Mainerider
Replied by Mainerider on topic 1980 KZ440 B carb question

mwriders wrote:

Mainerider wrote: Hello Folks,

A new member. I just added this bike to my stable as a get me the through the boring winter project and it's partially a "bike-in-a-box". Quick question; I searched but couldn't pin down what carbs came stock on this bike. The box has a set of Mikunis but the PO wasn't sure if these were the OEMs or not. I do all of my own work and I know how tight the fit is for the carb racks but these Mikunis seem simply too wide front to back to fit betwwen the airbox boots and the intake boots. Anyone know if the OEMs are Keihins or Mikunis? Thanks.


My 1980 KZ440B1 came with 36mm Keihins. Although, they also came to me in a box. Still, I think those were the OEM items.


Great; Thanks, that is helpful in pinning down the stock venturi sizing.

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C

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20 Dec 2011 14:06 #493960 by mwriders
Replied by mwriders on topic 1980 KZ440 B carb question

Mainerider wrote: One final, related question please...do the manifold carb boots from the various 400/440 models interchange? I could use a new pair and I've located a set from a 76 400.I "think" the 400/440 heads are spaced the same? Same size carb spigots? Thanks for any help.


I know that the boots on the intake side are not interchangable between a 400 and a 440, but the boxes themselves are (400 boxes accept 440 boots). It took me a couple of months and three boxes to figure that out. Don't know about the intake side, as I just bought an aftermarket set for the 440.

1980 Kawasaki KZ440B (brand new eBaby)
1998 Ducati 900S (gone)
1978 BMW R100S (gone, damn it)
1975 Yamaha RD350 cafe (gone)
1986 Yamaha XJ650 Seca (gone)
1981 Kawasaki KZ440LTD (gone)
1969 HD Sportster (gone :)
1966 Honda CB160 (gone, damn it)
1965 Suzuki 80

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  • mwriders
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  • if I only had a brain
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20 Dec 2011 14:11 - 20 Dec 2011 14:11 #493962 by mwriders
Replied by mwriders on topic 1980 KZ440 B carb question

Patton wrote: Courtesy of wiredgeorge, 13-5-2005:

Hmmm I was thinking that these 440s used Keihin CVs... didn't notice the initial comments. I am not sure I can recall seeing a 440 with Mikuni carbs. They may...
Essentially, the same Keihin carb(s) are used in the KZ250 (single), KZ305, KZ440, mid-80s 700 LTD, and many of the 4 cylinder 750 models from 1980-1983. These are harder to find parts for. No pilot jets that I can find and the primary main jets are real hard to find as well. The secondary main jets which are usually called just main jets in other Keihin carbs, are the same as those carbs and these are easy to get.


Good Fortune! :)


The primary jets are available from Jets R Us, as are the secondary mains, which as Patton says are sold simply as main jets. The primary mains are sold as "slow/pilot" jets.

1980 Kawasaki KZ440B (brand new eBaby)
1998 Ducati 900S (gone)
1978 BMW R100S (gone, damn it)
1975 Yamaha RD350 cafe (gone)
1986 Yamaha XJ650 Seca (gone)
1981 Kawasaki KZ440LTD (gone)
1969 HD Sportster (gone :)
1966 Honda CB160 (gone, damn it)
1965 Suzuki 80
Last edit: 20 Dec 2011 14:11 by mwriders. Reason: wrong company named

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20 Dec 2011 14:50 #493966 by 650ed
Replied by 650ed on topic 1980 KZ440 B carb question

Mainerider wrote: One final, related question please...do the manifold carb boots from the various 400/440 models interchange? I could use a new pair and I've located a set from a 76 400.I "think" the 400/440 heads are spaced the same? Same size carb spigots? Thanks for any help.


This is one of those “good news/bad news” things. The bad news is that according to Kawasaki.com the KZ440 and KZ400 use different carb holders. The good news is that the KZ440 carb holders (part number 16065-1027) are still available. Ronayers.com lists them at $29.50 each. Ed

Attachment KZ440CarbHolders.jpg not found


1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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20 Dec 2011 14:53 #493968 by Mainerider
Replied by Mainerider on topic 1980 KZ440 B carb question
Thanks for the info; I'll order them up.

'04 Honda VFR800
'96 Honda VFR750
'80 Honda CB650C

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