Carb change on kz1000 st 1980

Armahammer
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23 Sep 2022 10:59 #874337 by Armahammer

Carb change on kz1000 st 1980 was created by Armahammer

Hi I am refurbing my carbs on a 1980 st to my disappointment I found they were 26mm mikunis , I believe they should be 28mm they have a Acc pump, would this make a significant difference to performance,and is it possible to swop out the 26mm parts into some 28mm carbs .

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zed1015
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23 Sep 2022 15:09 #874357 by zed1015

Replied by zed1015 on topic Carb change on kz1000 st 1980

Yes! They should be 28mm and the 26's will slow it down a little.
Many parts are interchangable but it all depends what parts you mean.
You cannot fit the pumper parts into non pumper bodies unless you machine the bodies for the nozzles etc.
Non pumper 28's will work well.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-

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Armahammer
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24 Sep 2022 11:09 #874441 by Armahammer

Replied by Armahammer on topic Carb change on kz1000 st 1980

Hi was thinking of changing the float bowls from the26 mm. to 28mm carb bodies and would need to replace the inlet rubbers .are the float bowls interchangeable?

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gd4now
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Denco where did you go?

24 Sep 2022 13:05 #874445 by gd4now

Replied by gd4now on topic Carb change on kz1000 st 1980

I think it would be dependent upon which set of vm26ss carbs and which set of vm28ss carbs you have.

1977 KZ650 B1
Pods and Denco header

OLD KAW OWNERS SMILE ALOT

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Nessism
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24 Sep 2022 14:14 #874450 by Nessism

Replied by Nessism on topic Carb change on kz1000 st 1980

If I'm not mistaken, the rubber boots on the head are the same between the 26 and 28 carbs. I'm not sure about the airbox boots, though.

Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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zed1015
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24 Sep 2022 15:12 - 24 Sep 2022 15:13 #874453 by zed1015

Replied by zed1015 on topic Carb change on kz1000 st 1980

wrote:
Hi was thinking of changing the float bowls from the26 mm. to 28mm carb bodies and would need to replace the inlet rubbers .are the float bowls interchangeable?

Bowls will swap. You just won't be able to use the pump function.
Carbs are externally dimensionally the same so no need to change inlet or air box rubbers.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-

Last edit: 24 Sep 2022 15:13 by zed1015.

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hardrockminer
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24 Sep 2022 17:17 #874466 by hardrockminer

Replied by hardrockminer on topic Carb change on kz1000 st 1980

Unless you plan to go 140 mph I wouldn't worry about the 26 mm carbs. I swapped my 28's for some 76 26's on my 1980 KZ1000 LTD and they perform just fine, although I've never taken the bike over 100 mph.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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Armahammer
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25 Sep 2022 05:49 #874487 by Armahammer

Replied by Armahammer on topic Carb change on kz1000 st 1980

Thanks guys for the very useful info will let you know how i get on.

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