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TOPIC: Mikuni VM 33 Carbs

Mikuni VM 33 Carbs 02 Jan 2017 11:15 #751165

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Semi hi-jack maybe :ohmy:

They seem to sell quickly on flea bay for around $300.00 give or take.
They were once THE carbs to use, many moons ago…..
I believe its called "Oppositional Defiance Disorder"

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Mikuni VM 33 Carbs 02 Jan 2017 12:02 #751169

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Jonny wrote: I hope I am not highjacking here, but I am curious about whether or not there is much of a market for VM33's. I've read through this whole thread, and get the feel that at least Steve is having success with them.

I mainly ask because I seem to have inherited a set with a parts 650 I picked up a couple of months ago. As soon as I can get it organized, I will post some photos, to confirm what they are. I reckon somebody else can let me know if I have it wrong anyway.

The plan had been just to tidy them up for sale, as they are far too big for any of my bikes, and it seems they have some intrinsic value. If the OP was suggesting they can be worth $250-300 USD, then it is worth the time to clean them up and sell them off. (Or, as always for fair prize to a fellow KZer.)

Pics soon,

Cheers,
Jon


I don't mind. Put up some pics before you spend any money on them. B)
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 02 Jan 2017 14:40 #751182

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Thanks all for helping with the identification.

The photos aren't great, as they are just off my cell phone, but I think they are at least sufficiently good to figure out what these are.










They've clearly been modified for vacuum ports by somebody, which among a couple other things suggested to me that they were maybe the VM33s, which as per earlier did not come with synching ports. I did check the bore diameter quickly at the fellows house, and I seem to remember it being a touch OVER 33mm, but not an awful lot. I currently have then soaking in some hot soapy water to clean them up at least a little before moving on.

If this isn't enough info for a good identification, then let me know, and I can take some more photos or look for other distinguishing marks.

Thanks in advance,

Jon
'78 KZ 650C2 'Lila'
'71 Norton Commando 750 'Eadie'
'83 440 LTD 'Ratbike'

St. Catharines, ON (Mostly, anyway...)
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Last edit: by Jonny.

Mikuni VM 33 Carbs 02 Jan 2017 15:15 #751183

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Yup, just like mine.
Steve
Z1b1000 1975 Z1b
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Mikuni VM 33 Carbs 02 Jan 2017 17:48 #751215

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Great,

Thanks Steve. Appreciate the confirmation. I guess I will give them a little bit of love and a good clean up and sell 'em off to someone who can put them to good use.

Cheers!
'78 KZ 650C2 'Lila'
'71 Norton Commando 750 'Eadie'
'83 440 LTD 'Ratbike'

St. Catharines, ON (Mostly, anyway...)

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Mikuni VM 33 Carbs 03 Jan 2017 17:12 #751324

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To id Mikuni carbs there is a number stamped on the bolt flange in front of the choke lever
on the number one carb (left side sitting on bike).

Jonny I may be up for those VM33's what kind of bucks if you don't touch them and sell as is.
Not doubting your ability but first thing I'll do is break them down for a few hour ride in the sonic cleaner
no sense you doing it then me do my thing with them
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Mikuni VM 33 Carbs 04 Jan 2017 09:00 #751364

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PM sent Dave!
'78 KZ 650C2 'Lila'
'71 Norton Commando 750 'Eadie'
'83 440 LTD 'Ratbike'

St. Catharines, ON (Mostly, anyway...)

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Mikuni VM 33 Carbs 26 Jan 2017 18:45 #752973

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AFTERMARKET PETCOCK
Rather than starting another thread I thought I'd put it here. It appears the port going to the sediment bowl is smaller than the inlet tubes. I've always suspected the big carbs were starving for fuel at WOT or high speed riding. Didn't have that problem with the stock one. The 33's have two feed lines and a common galley connecting all four carbs. The needle seats are large with strainer screens on each one. The port might be my next mod. :whistle:
Steve
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Mikuni VM 33 Carbs 26 Apr 2017 13:48 #760315

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Trying to get the pilot air screws to work.
Steve
Revised clip below.
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Last edit: by SWest.

Mikuni VM 33 Carbs 26 Apr 2017 19:16 #760337

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SWest wrote: Trying to get the pilot air screws to work.
Steve



What size are the air screws you have in there?
1982 KZ1100A-2 (sort-of)
January 2016 BOTM

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Mikuni VM 33 Carbs 26 Apr 2017 19:23 #760338

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I don't understand. I got them from jetsRus
Steve
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Mikuni VM 33 Carbs 26 Apr 2017 19:41 #760340

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Sorry, got the screw mixed up with the air jet :blink:

Maybe it doesn't matter, but observing the Jets R Us "Air Jet Chart", it shows various sizes available with the BS30/97 1.2 standard specification Pilot Air Jet for the KZ1000/1100

Check out the chart below the exploded view and red highlight over Standard Jetting Specifications VM33 Smoothbore


www.jetsrus.com/carburetor/carb_mikuni_V...oded_view_parts.html
1982 KZ1100A-2 (sort-of)
January 2016 BOTM

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Last edit: by daveo.

Mikuni VM 33 Carbs 26 Apr 2017 19:46 #760342

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Oh, these are the pilot air screws.
Steve
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Mikuni VM 33 Carbs 26 Apr 2017 19:54 #760343

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Maybe the Air Jet size needs changing for your screws to achieve the effect you are after...:unsure:
1982 KZ1100A-2 (sort-of)
January 2016 BOTM

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Mikuni VM 33 Carbs 27 Apr 2017 06:24 #760375

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These carbs have 2.0 slides. In the chart they should be 1.5 for Kawasaki. The slides are very expensive. I use to have a manual that told how to file them to make them 1.5 but it was stolen. I could tweak the air settings but that won't effect the pilot settings. Here's a revised clip.
Steve
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Mikuni VM 33 Carbs 27 Apr 2017 18:04 #760433

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The holes made a difference.
Steve
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Mikuni VM 33 Carbs 27 Apr 2017 22:01 #760451

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None better place besides home...
Sounds like you are there :)
1982 KZ1100A-2 (sort-of)
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The following user(s) said Thank You: SWest

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Mikuni VM 33 Carbs 06 Jun 2017 14:30 #763731

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The bike finally "leaned out." It had to get pretty hot to do it. I got back home and adjusted the timing and pilot screws. Much better. The bike pulls harder and some of the noise has gone away. I'd rather not go back to the #70's. I may go leaner still. I'll do the cam bearings and readjust.
Steve
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Mikuni VM 33 Carbs 28 Jun 2017 15:21 #765601

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The oppressive heat has lifted at least for a few days. Got a few things to get done while I have the chance in the mornings.
Steve
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Mikuni VM 33 Carbs 28 Jun 2017 17:51 #765612

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Test ride tomorrow.
Steve
Z1b1000 1975 Z1b
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