Wanted Keihin Carb

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gobium
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Re: Wanted Keihin Carb

Post by gobium » Sun Feb 07, 2016 2:40 pm

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jaybird
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Re: Wanted Keihin Carb

Post by jaybird » Sun Feb 07, 2016 2:54 pm

TerryG wrote:
markhas wrote:
INSUBORDINATOR wrote:If I could afford it, I'd have put on a Pay & Play set of Mikuni's, IMO much better performing, responsive Carbs.
Check out Hubert kriegal (thetimelessride.com) extensive testing of Mikuni carbs and why he abandon the idea because of their failure.
He abandon the 32mm ones because he could not get them tuned - because they were too big and flowed too much for a Ural. That is why Ural chose 28mm Mikunis (and used 28mm Pekars too) for the 650 models, and later replaced them with 32mm CVKs. In general a 4mm size difference will yield the same performance level between a CVK and a round slide Mikuni due to the flow restrictions of the CVK carbs. The only exception I know of is the 70s Suzuki 750 2-stroke Water Buffalo which went from 32mm round slides to 40mm CVs, but they also increased the porting a lot.
Hi Terry,

So you're saying that the Mikunis from a 650 Ural will work, with proper jetting? I'm just curious and want to be sure I understand your statement.
I would think that mikunis for a 650 would be a lot easier to find.

Happy trails,
Jaybird
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2013 Retro, Black beauty, AKA Lucky "13"
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TerryG
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Re: Wanted Keihin Carb

Post by TerryG » Sun Feb 07, 2016 3:07 pm

Same carb - different jetting. You'll need main and pilot jets. Didn't record whether or not the needles were the same, but you could get an aftermarket set from Raceway and be better of anyhow.
Terry

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mouka
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Re: Wanted Keihin Carb

Post by mouka » Tue Feb 09, 2016 11:02 am

gobium wrote:Ebay.
goggle Ural carburetor
That would be a great idea except they sell them on ebay for $600 plus shipping. I am not that desperate for carbs.
At $100, I am a taker. At $600, I would rather sell the rig as it is and go back to my trusted Hondas.
2005 Honda Sabre 1100
2003 Ural Tourist
1998 Honda Aero 1100

mouka
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Re: Wanted Keihin Carb

Post by mouka » Tue Feb 09, 2016 11:04 am

TerryG wrote:Same carb - different jetting. You'll need main and pilot jets. Didn't record whether or not the needles were the same, but you could get an aftermarket set from Raceway and be better of anyhow.
Can you please elaborate a little bit more?
Which Mikuni are we talking about? I can make the Mikuni work if it is a bit cheaper than the Keihins.
2005 Honda Sabre 1100
2003 Ural Tourist
1998 Honda Aero 1100

nbsdave
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Re: Wanted Keihin Carb

Post by nbsdave » Tue Feb 09, 2016 11:27 am

mouka wrote:Bumping the post. I definitely need at least one carb.
I just need the body of the carb. I have everything else.
If you have what I am looking for and do not want a huge amount of money, please let me know.

Thanks

you ever try this place"
pretty sure they have at least one
http://mikesurals.com/
just call and ask
keep your word, no excuses
Ural-it's not just another motorcycle!
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Re: Wanted Keihin Carb

Post by jaybird » Tue Feb 09, 2016 11:51 am

mouka wrote:
TerryG wrote:Same carb - different jetting. You'll need main and pilot jets. Didn't record whether or not the needles were the same, but you could get an aftermarket set from Raceway and be better of anyhow.
Can you please elaborate a little bit more?
Which Mikuni are we talking about? I can make the Mikuni work if it is a bit cheaper than the Keihins.
I couldn't quite follow that response either.

Happy trails,
Jaybird
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2013 Retro, Black beauty, AKA Lucky "13"
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Re: Wanted Keihin Carb

Post by TerryG » Tue Feb 09, 2016 1:00 pm

jaybird wrote:
mouka wrote:
TerryG wrote:Same carb - different jetting. You'll need main and pilot jets. Didn't record whether or not the needles were the same, but you could get an aftermarket set from Raceway and be better of anyhow.
Can you please elaborate a little bit more?
Which Mikuni are we talking about? I can make the Mikuni work if it is a bit cheaper than the Keihins.
I couldn't quite follow that response either.

Happy trails,
Jaybird
I was answering his question about 650 CVKs on his 750 - not the Mikuni question. Guess I should have quoted him.

For the Mikuni: I would go with 30mm carbs. They are the same physical size as the 28mm, just bored out a little so intake boots should work. The 28mm came standard on the 650s for a short while, so 750s could use a little more. The problem with the 32mm is that they are all VMs and are 'racing' carbs so they tend to flow too well for a slow turning Ural engine. The jetting, slide cutout, and needles for a 30mm should be about the same as the 28mm were (at least as a good starting place).

for 650 Mikuni:

Main Jet: 110
Pilot Jet: 35
Needle: 5F21
Slide Cutout: 2.5

(I am talking round slide - not flat slide. Don't know about them.)
Terry

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Re: Wanted Keihin Carb

Post by jaybird » Wed Feb 10, 2016 2:12 am

TerryG wrote:
jaybird wrote:
mouka wrote:
TerryG wrote:Same carb - different jetting. You'll need main and pilot jets. Didn't record whether or not the needles were the same, but you could get an aftermarket set from Raceway and be better of anyhow.
Can you please elaborate a little bit more?
Which Mikuni are we talking about? I can make the Mikuni work if it is a bit cheaper than the Keihins.
I couldn't quite follow that response either.

Happy trails,
Jaybird
I was answering his question about 650 CVKs on his 750 - not the Mikuni question. Guess I should have quoted him.

For the Mikuni: I would go with 30mm carbs. They are the same physical size as the 28mm, just bored out a little so intake boots should work. The 28mm came standard on the 650s for a short while, so 750s could use a little more. The problem with the 32mm is that they are all VMs and are 'racing' carbs so they tend to flow too well for a slow turning Ural engine. The jetting, slide cutout, and needles for a 30mm should be about the same as the 28mm were (at least as a good starting place).

for 650 Mikuni:

Main Jet: 110
Pilot Jet: 35
Needle: 5F21
Slide Cutout: 2.5

(I am talking round slide - not flat slide. Don't know about them.)
Thanks for the reply terry,

Sorry, maybe I didn't read far enough back into the thread, I have a pair of good mikuni's on a 650 engine, and from your statements I thought I might be able to use them on a 750 if need be. I didn't know that Ural used the CVK on their 650 engines.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
2008 Enfield Bullet 500
1974 BMW R 75/6
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Re: Wanted Keihin Carb

Post by TerryG » Wed Feb 10, 2016 12:54 pm

Give the Mikunis a try on your 750, they should work well enough to at least get you down the street at reasonable speeds.
Terry

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mouka
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Re: Wanted Keihin Carb

Post by mouka » Thu Feb 11, 2016 9:37 am

TerryG wrote:Give the Mikunis a try on your 750, they should work well enough to at least get you down the street at reasonable speeds.
Terry,

Can you please send a link to the Mikuni carbs you are talking about?
How about the carb compliance fittings? Would they work the same?

Thanks
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2003 Ural Tourist
1998 Honda Aero 1100

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