Author Topic: Need help to identify- Found out they 29MM smoothbore (Read 6780 times)

Tews19 · « **on:** November 14, 2011, 11:43:38 AM »

I was going to post in the "other thread" but I know the carbs came off of a 750.. Just not sure what type. I was told they may be "smoothbores"

Also, this wheel, I have no clue what kind it is as well..... Thanks in advance for any insight guys..

jaguar · « **Reply #1 on:** November 14, 2011, 11:57:50 AM »

Carbs are cheap chinese know offs
Major scandal from back in the day

Lots of people got hurts in fires. It was a bad time in motorcycles

Really you should just trade them to some #$%* for the stock carbs...
Hey wait i have stock carbs that would work great on your bike

Ill even pay shipping...
Do WANT

Tews19 · « **Reply #2 on:** November 14, 2011, 12:03:11 PM »

Ahh glad to see you Jags. I knew you would know, hence the reason I posted on the other site as well. Can you please inform me if the cheap knock offs is true? I was told they are really nice carbs and high quality.... expensive was the word described for them.. I will not be using them and may look to get rid of them.

Hush · « **Reply #3 on:** November 14, 2011, 12:09:40 PM »

That wheel looks decidedly Italian!
I always hated the twin leading shoe brakes on my bikes, about as much stopping power as oil on a black iced road!

jaguar · « **Reply #4 on:** November 14, 2011, 12:13:43 PM »

The wheel is probably a british wheel

As for the carbs you need to take a picture(we love pics) down the bore of the carbs with the slides up.
IF you cant see the slide then they are smoothbores. if not they are VMs
Either way they are nice carbs

MCRider · « **Reply #5 on:** November 14, 2011, 12:18:42 PM »

I thinks Jag was jokin around. They look like Mikuni VM29 Smoothbores. I have 2 and am ashamed to say i can't confirm by looking. I'd need some time to match things up.

If they are, they routinely go for $400+ on eBay. Mikuni no longer makes them. They are prized by the Z1 crowd. I had/have them on my current project and they were wonderful performers. As many others here will attest.

But again I can't say for sure. Did someone who informed you mention "VM29"? The VM28s are not nearly as coveted.

DynoMan sells the rubber manifods for about $150 set and they are NA right now. The VMs work great on the CB750 esp if overbored.

jaguar · « **Reply #6 on:** November 14, 2011, 12:25:07 PM »

Thats what it looks like down a set of smoothbores from a kawi
I think that these are 26? but it gets the idea across

jaguar · « **Reply #7 on:** November 14, 2011, 12:46:35 PM »

prices are all over the place
But new CR carbs can be had for under $700 and they are more then twice as nice....but not vintage....so i guess not really apples to apples
Truth is like all of these "whats it worth" threads its all over the place

I watches a sandcast frame sell for almost $3000 not that long ago but couldnt get half that for mine and it was a left hand bracket....stories are all over....

http://providence.craigslist.org/mcy/2648184625.html
Just bought those carbs for $160 From what i can tell from other pictures they sent me they are 29mm smoothbores.

I do wonder who buys some of the parts for the big money.
we all say that its worth X but when something comes up listed for that we are upset that our beloved hobby is getting to expensive to enjoy. Look back at the "unicorn" clamp threads....i dont know if i would spend $100+ on one....but then again i dont have a $40k sandcast(different subject). people were saying they arent rare. they are right.

MCRider · « **Reply #8 on:** November 14, 2011, 01:16:51 PM »

Jag: If they truly are VM29s, then the seller simply didn't know what he had. Z1 Enterprises has a legend on theri page that says "if anyone wants to sell VM29s, contact us". (Might have been DynoMan) Point being people want them. I've been watching them on eBay for 4+years. $400+ is not uncommon.

Granted if I had new money coming to market i would probably buy something newer. But owning a set that I didn''t want, they can bring real good money. (Tews, don't give them away) And owning a set, or two, that I do want, won't be a disappointment.

As to the Unicorn fork bridge, the most recent one went for $150 used. $200+ is not uncommon. (3 buy it now at $200+) May not fit one's definition of rare, but they don't make them anymore, and each time someone breaks one they get a little rarer.

There is one with 3 hours left, current bid $102. If it goes for that, the buyer was lucky, and that happens.

PS: In your second post you imply that VMs are not smoothbores. They are.

http://www.motorcyclecarbs.com/About_Mikuni_VM29_Smoothbore_C_W307.cfm

Ricky_Racer · « **Reply #9 on:** November 14, 2011, 01:26:09 PM »

VM29 Smoothbores. Triumph brake. RR

MCRider · « **Reply #10 on:** November 14, 2011, 01:32:16 PM »

Quote from: Ricky_Racer on November 14, 2011, 01:26:09 PM

VM29 Smoothbores. Triumph brake. RR

Thanks for the confirm. There is a set on ebay now, current bid $225, reserve not met. Buy it Now = $850! Now they are really REALLY nice, completely gone thru, better than new, but dang!

I was thinking that wheel looked Triumph. I worked in Honda shops that often had Triumphs as the second line. That air scoop was great for directing water on the brake shoes.

Tews19 · « **Reply #11 on:** November 14, 2011, 01:44:12 PM »

Quote from: Ricky_Racer on November 14, 2011, 01:26:09 PM

VM29 Smoothbores. Triumph brake. RR

Hey RR. The wheel is a triumph? Thanks for the lead. Thanks to all for the insight. I contacted Z1 and thy confirmed 29mm smooth bore. Now it's time to find out if the slide is 1.5 for gs1 or the cb750 or 2.0 for the z1000. I have no need for the carbs. I will clean up and post them for sale. Once again thanks to all for the help

jaguar · « **Reply #12 on:** November 14, 2011, 03:56:37 PM »

Well what will it take to buy them?

Tews19 · « **Reply #13 on:** November 14, 2011, 06:39:36 PM »

I am going to clean them up and post them on Ebay and on this forum. I was advised by Z1 to list them on KZrider and thegsresource website to make the most. I really do appreciate all the insight guys. They aren't mine to sell. The owner has a specific price he wants and bought them new.. They have less then a few hundred miles on them. Just been sitting forever to have the build up of gunk in them. To those who sent me PM's with more info I really am thankful and grateful for your help as well.

Tews19 · « **Reply #14 on:** November 14, 2011, 07:39:20 PM »

So I opened them up tonight and they have the 1.5 on the slides. Set up for the Cb750..

grcamna2 · « **Reply #15 on:** November 14, 2011, 07:41:44 PM »

Are you going to set them up in your bike?, they might give you what you're looking for as far as the great performance you want...but stock works great too.

Tews19 · « **Reply #16 on:** November 14, 2011, 07:43:14 PM »

They aren't mine. They a buddies plus I don't own a 750.. I have 2 550's. He wants me to sell them for him so I will be doing that.

jaguar · « **Reply #17 on:** November 16, 2011, 06:35:38 PM »

So these are?

grcamna2 · « **Reply #18 on:** November 16, 2011, 07:13:09 PM »

Stock carbs from the 77'-78' CB750K's...very lean running carbs; use those 29mm smoothbores !

bwaller · « **Reply #19 on:** November 16, 2011, 07:54:49 PM »

Jaquar, those look to be Mikuni VM26's. I'd need to see an end with a rubber boot off to be sure.

jaguar · « **Reply #20 on:** November 16, 2011, 08:19:22 PM »

might be right...the intake is 27mm
Win some you lose some

Why would someone run these on a cb750?

bwaller · « **Reply #21 on:** November 16, 2011, 08:26:41 PM »

Then they are 26's. They are nearly fully 27mm full round compared to the complicated shape of the 28mm Keihin's. I don't see any advantage though.

Now I have a set of VM28's from an early Z1 that I fully rebuilt if anyone is interested.

They are supposed to come close to the smoothbore performance.

fishhead · « **Reply #22 on:** November 17, 2011, 05:33:24 AM »

The VM29 "smoothbores" are very different than the VM26-28. The main performance difference being the smoothbore inserts.
The pic below shows the VM-non-smoothbore. It has a cut out where the slide travels(red-arrow) making the air tract not very smooth. The 29's have an insert here that makes them smooth-er and the slide is "hollow" to fit around the insert.
The VM-29 Smoothbores will always have the extra brass plugged castings in the intake bell and the right hand side of the carb body will have a square cast in them (above the float bowl, centered on the right hand side of the carb).
The 29's will usually have a bowl drain plug on the bottom of the float bowl. Some very early ones do not have the drain plug, but they still have the extra castings in the bell and the cast in square.
The VM 28's are a semi affordable alternative to the smoothbores and were also available with accelerator pumps (the smaller VM's also came with/without accel pumps,also)

Tews19 · « **Reply #23 on:** November 17, 2011, 01:55:21 PM »

Those look a lot like the carbs I took off of a 78 KZ650B. I ended up selling them for I think 75 bucks or maybe 90..

On a side not, if anyone is interested with the smoothbores PM me.

Tews19 · « **Reply #24 on:** November 17, 2011, 02:30:38 PM »

more pics of the carbs.

Brass bead is an indicator of them being smoothbore's

If you look closely, you can see a 1.5 on the slide.. Indicator already set up for the Cb750 or the GS.

Nice yellow dot showing the carbs have not been messed with

If anyone would like to purchase send me a PM

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Author Topic: Need help to identify- Found out they 29MM smoothbore (Read 6780 times)