Mikuni VM33 Rebuild Kits?

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Mikuni VM33 Rebuild Kits?

08 Jun 2022 06:13
#868482
A previous owner put A set of VM33 carbs on my 85 GSX-R750. I think that KZs came with these so I’m asking around: . Does anyone know of a rebuild kit for this carb? Most kits are sold based on make and model and I don’t know exactly what KZs were sold with these carbs. Thanks KZRiders. 

Attachment not found

-Gene
85 Suzuki GXR-R750
68 Yamaha YCS1C
67 BSA 650 Lightning

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Re: Mikuni VM33 Rebuild Kits?

08 Jun 2022 06:36 - 08 Jun 2022 06:38
#868488
No “kits” are available as far as I know. Most times the brass will be reusable, aka Jets,Floats, Needles and Seats, etc. most just need a good cleaning, new ORings and gaskets. Check the below for parts.
jetsrus.com/  
www.sudco.com/index.html  
www.nichecycle.com/ncs/  
 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
Last edit: 08 Jun 2022 06:38 by Mikaw.
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Re: Mikuni VM33 Rebuild Kits?

08 Jun 2022 07:06
#868493
The VM33 Smoothbore carbs are aftermarket performance racing carbs and no KZ or other factory machine ever came with them fitted as stock.
There are no rebuild "kits" available and individual parts will have to be sourced from Mikuni dealers and other suppliers.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





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Re: Mikuni VM33 Rebuild Kits?

08 Jun 2022 07:07
#868494
wrote:
A previous owner put A set of VM33 carbs on my 85 GSX-R750. I think that KZs came with these so I’m asking around: . Does anyone know of a rebuild kit for this carb? Most kits are sold based on make and model and I don’t know exactly what KZs were sold with these carbs. Thanks KZRiders. 

Attachment not found


 
Those are considered aftermarket racing carburetors, they never came stock on Suzuki/Kawasaki etc. street bikes. They are a high performance carburetor. Most parts are still available from Mikuni, but some parts are no longer available.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
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Re: Mikuni VM33 Rebuild Kits?

08 Jun 2022 16:32
#868527
Agree with breaking down the carbs, cleaning with carb dip, then assembling with fresh O-rings and gaskets.  Don't be afraid of unganging, since that's the only proper way to clean.  
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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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 08:04
#868669
Thank you KZ riders for the information. Z1 Enterprises has everything I need that’s consumable. including a very cool float level gauge to fit that carb. After reading on your site I’m now wondering if it’s too big for my bike but it runs fine … at full throttle. Lol
-Gene
85 Suzuki GXR-R750
68 Yamaha YCS1C
67 BSA 650 Lightning

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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 08:08
#868670
After unganging a set of CB650C carbs for rebuilding I am very afraid. Lol. I think it took me an hour to get the spring and rods lined back up. But you’re right about it being the only way to do a good job. Got any videos or posts describing it for these carbs?
-Gene
85 Suzuki GXR-R750
68 Yamaha YCS1C
67 BSA 650 Lightning

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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 10:05 - 12 Jun 2022 10:19
#868674
No videos. Slowly dismantle and take detailed photos. There is one spring on the shaft but it doesn’t need to come apart to ungang them. Take special note of the felt dust seals on the center of the shaft and their placement in relationship to the plastic spacer. They are pretty simple. The hardest part it getting the main jet holder aligned (jet block) correctly so the slide raises and lowers clean and smooth.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
Last edit: 12 Jun 2022 10:19 by Mikaw.
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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 10:25 - 12 Jun 2022 10:25
#868677
You may find more Suzuki model specific info here : www.gixxer.com/forums/

Originally your bike came with Mikuni VM29SS carbs which are a small early version flat slide carb similar to the Mikuni RS34 flat slide.
Very often these original carbs were pirated off these bikes for use on other machines. The way forward was usually a set of Mikuni RS34 as a upgrade.

The original carbs are very sought after and in good condition command high resale value.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
Last edit: 12 Jun 2022 10:25 by Injected.

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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 10:25
#868678
Make sure you support the float pivot boss while tapping out the float pin. They are a tight friction fit and you can snap off the float boss easily. I’ve used a socket under the boss with the carb on it’s side. Tap the pin into the socket with gentle light blows.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 13:24
#868680
Here is a guide about the regular VM's... gsarchive.bwringer.com/bikecliff/images/vm_carb_rebuild.pdf

I would not take the slide apart unless you need to change the needle position.  Just use carb cleaner spray and make sure it's clean before reuse.
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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Re: Mikuni VM33 Rebuild Kits?

12 Jun 2022 14:18
#868683
These guys will rebuild them for you if your budget would allow it. They quoted me $450 U.S. for a complete rebuild of my vm33s.   bearscycleshop.com/
 
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