What is the deal with Keihin carbs? (2011)

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VR880 said:
One other thing about the Keihin Flat Slides. They are so compact they look like a single. I have the race version fitted to the VR880 by Kenny Dreer. The bike always starts, idles easily and runs like a scalded cat when you twist the throttle. I am not sure how much effort went in to setup but I can say once they are set up they are an amazing carb that out performs just about everything else out there IMHO.
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The Keihin is indeed much more compact than all other carbs commonly available to fit the Commando.............to the extent that fitting to a stock bike is a matter of using flange to spigot mount adapters, and simply bolting them onto the stock manifolds. Seems astonishing that people spend so much time and effort messing around trying to get Anals working, when a couple of OKO's (quality Keihin copy) at a little over $60 will work far better in every way!
 
I have no problem with somebody who wants modern carbs, so don't want to get dragged into the argument about Amals being made from trash, etc. However, I have purchased "quality" Keihin copies made in China because the price seemed to good to be true. It was. You want cheap, that is what you get.

Russ
 
Carbonfibre said:
VR880 said:
One other thing about the Keihin Flat Slides. They are so compact they look like a single. I have the race version fitted to the VR880 by Kenny Dreer. The bike always starts, idles easily and runs like a scalded cat when you twist the throttle. I am not sure how much effort went in to setup but I can say once they are set up they are an amazing carb that out performs just about everything else out there IMHO.
Click to expand...


The Keihin is indeed much more compact than all other carbs commonly available to fit the Commando.............to the extent that fitting to a stock bike is a matter of using flange to spigot mount adapters, and simply bolting them onto the stock manifolds. Seems astonishing that people spend so much time and effort messing around trying to get Anals working, when a couple of OKO's (quality Keihin copy) at a little over $60 will work far better in every way!
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You are talking about two different Keihin carbs. The Dreer carbs are Kiehin FCR flatslides and are first rate all the way.
The OKO carbs are Keihin PWK copies. They can work very well but like most discount knock-offs they occasionally have quality control issues. Jim
 
Never ever had a single problem with OKO carbs, and quality is comparable to Keihin which cost about 4 times as much! Not quite sure why anyone would want to fit FCRs to a road bike, as performance wont be much better than using a pair of OKO's which cost less than a pair of FCR slides.

However there are some pretty poor Keihin copy carbs made in China and Thailand, and these need to be avoided, as do "no name" carbs which have had the branding removed.
 
Carbonfibre said:
Never ever had a single problem with OKO carbs, and quality is comparable to Keihin which cost about 4 times as much! Not quite sure why anyone would want to fit FCRs to a road bike, as performance wont be much better than using a pair of OKO's which cost less than a pair of FCR slides.

However there are some pretty poor Keihin copy carbs made in China and Thailand, and these need to be avoided, as do "no name" carbs which have had the branding removed.
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Im still looking at the induction side of things and dont really like the single mikuni (more the manifold than anything else), what sort of experience have you had with the oko carbs, what bikes have you set them up on?
 
Have been using them for around 4-5 years on off road bikes............very few problems, and would think the 32mm ones would work great on a Norton. Think there is someone in the US selling the Chinese (Koso) made Keihin copy carbs, which have had the branding removed.......... but not had any experience of these.
 
Carbonfibre said:
Not quite sure why anyone would want to fit FCRs to a road bike, as performance wont be much better than using a pair of OKO's which cost less than a pair of FCR slides.
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Why would anyone want a Commando when performance won't be much better than a Yamaha XS650 which cost less?
 
If anyone here in the US buys 15 of the 32mm PWK copies made by OKO (or whomever) - I'd like to buy one from them & check it out so I know whats what.

Just send me a private message.

or email to

Jim@jsmotorsport.com

Jim
 
BrianK said:
Carbonfibre said:
Not quite sure why anyone would want to fit FCRs to a road bike, as performance wont be much better than using a pair of OKO's which cost less than a pair of FCR slides.
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Why would anyone want a Commando when performance won't be much better than a Yamaha XS650 which cost less?
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Looks :!:

Jean
 
jseng1 said:
If anyone here in the US buys 15 of the 32mm PWK copies made by OKO (or whomever) - I'd like to buy one from them & check it out so I know whats what.

Just send me a private message.

or email to

Jim@jsmotorsport.com

Jim
Click to expand...


I have not had any experience of the flat slide carbs you are using Jim (which I think might be Koso's), but OKO carbs are easily available from Ebay, and it might be well worth getting some to try, as you may find they are better than what you are using currently, and if you deal directly with OKO in Taiwan unit cost will be less than the wholesaler in China.
 
I found a side by side comparison of the OSOs and the Keihin carbs on youtube. The D slides on the OSOs wear quick and are made of inferior quality but I do not know how long they would last. Would be interesting if the D slide from a Keihin would fit the OSO and that may take away that issue.

Have found PWKs from Steadfast Cycles if I remember right starting at $215 on the bids or buy it now at $235. If I had the funds I would buy those but unfortunately I had to put all the money I do not have to an attorney to fight a case against ex on my son so until that is done I am going to have to stick with Amals. Have bid on a set of 3.5 slides and waiting the end of auction tonight to see if I win. Those should get me through the season for now since the plugs look good but the idle sweeps about 200 rpm, maybe fresh slides will keep my idle steady?!

Also saw some PWK copies on the chinese site for about $17 each and you can buy just one. Heck, $35 would not be too bad to try that route!
 
Have not heard of OSO carbs, but the slides on the OKO's we have been using for 4 years show no visible signs of wear.
 
Carbonfiber

Show me where the 32mm OKOs are available on ebay. You can find them in other sizes but not 32mm
 
I guess very few people use the 32mm carbs (I think the body is bigger than the 30mm), so you cant find them on Ebay. They are available singly here though: http://www.aliexpress.com/fm-store/7021 ... 32MM-.html

Personally I would buy a pair of 30mm OKO's and see what they are like, and if they look ok, then contact the OKO factory and see if you are able to deal direct, and ask them to send your drawings of the 32mm ones to make sure they will fit properly, and see what sort of prices they can provide.
 
Carbonfibre said:
I guess very few people use the 32mm carbs (I think the body is bigger than the 30mm), so you cant find them on Ebay. They are available singly here though: http://www.aliexpress.com/fm-store/7021 ... 32MM-.html

Personally I would buy a pair of 30mm OKO's and see what they are like, and if they look ok, then contact the OKO factory and see if you are able to deal direct, and ask them to send your drawings of the 32mm ones to make sure they will fit properly, and see what sort of prices they can provide.
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$204.22 delivered for a pair is a little over your $60 quote from earlier. What's up with that?
 
Carbonfibre said:
Have been using them for around 4-5 years on off road bikes............very few problems, and would think the 32mm ones would work great on a Norton. Think there is someone in the US selling the Chinese (Koso) made Keihin copy carbs, which have had the branding removed.......... but not had any experience of these.
Click to expand...


On off road bikes it seems to be every one is putting the FCRs on them, tempted to pull the Dellorto off my 501 and try one, lots around second hand now
 
I am considering replacing the single, 1-1/16", 376 Monobloc on my Model 99 project with a pair of Premier 626 Concentrics.

The standard 99 Monobloc has:

Main Jet - Size 250
Needle Jet - Size 106
Pilot Jet - 25cc or 20cc
Throttle Slide No. 3 Cutaway


I would like to try and avoid to much T&E, so; has anybody done this upgrade & can recommend a jet/slide specification for the 626 Premier Concentrics?
 
Carbonfibre said:
The "unbeatable" Amals mentioned here must be made out of something other than the lead/zinc pot metal that is used more commonly? Like it or not making precision parts using materials which are totally unsuitable, results in rapid wear and in the case of a carb reduced levels of performance.
QUOTE]

I’m no metal expert, but I understand that Amal’s are made from a Mazak alloy (monkey metal?) commonly used in the production of motor parts such as carbs, fuel pumps;

https://www.model-engineer.co.uk/forums/postings.asp?th=30815
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So I have a contribution to offer for the JS carbs. I JUST pulled my bike from a 2 year sleep out to throw a battery and some new oil in it and noticed it fired first kick. It ran great with the old gas too on a 15 mile run. I strongly suggest the JS flatslides as once I got them tuned before they have ben bulletproof since.

I don't baby my bike either, my method is to ride it and if it breaks, rebuild it.

This is an old pic but shows the carbs nice, I will dig a new pic up too...

What is the deal with Keihin carbs? (2011)


What is the deal with Keihin carbs? (2011)
 
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iceteanolemon said:
So I have a contribution to offer for the JS carbs. I JUST pulled my bike from a 2 year sleep out to throw a battery and some new oil in it and noticed it fired first kick. It ran great with the old gas too on a 15 mile run. I strongly suggest the JS flatslides as once I got them tuned before they have ben bulletproof since.

I don't baby my bike either, my method is to ride it and if it breaks, rebuild it.

This is an old pic but shows the carbs nice, I will dig a new pic up too...

What is the deal with Keihin carbs? (2011)


What is the deal with Keihin carbs? (2011)
Click to expand...


Properly prepared for storage, ANY/ALL carbs will wake up ready to rock.
 
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