Am I the only one that thinks every time there is an update the price goes up $500? I'd say you are up to around $1500-2000 by now. Even so, it will be interesting to hear what the Japanese distributor tells you.

any reply from japan on the carbs yet????

if anyone is interested in these carbs just contact sudco andtalk to them.
that would be the best bet.
i havent my self,but i have looked in the catalog and see nothing for us.
could probably adapt the sv kit it uses 41mm.

Any updates on this? With flatslides and a fuel pump, I could probably get a turbo setup that runs well. This is how the ZRX guys tend to do it.

This might be of interest to someone...

Just to let everyone know.

People have started doing this mod on KTM 950's. Supermoto, Adventure, Superenduro ect... Pretty much all the carb 950's. Adventure Machines Northwest (39mm) sells a kit for them. $$$. http://www.advmachines.com/KTM_950_FCR_p/fcr1039.htm

I have been reading some threads on ADVrider and the results have been positive but no Dyno #'s.

FYI, I just sent an e-mail to Allens Performance Ltd in the UK to enquire about their kits. I had sent a request some time ago to a supplier in Japan (a name given to me by Sudco, whom I had contacted only to be told they offered no such kit) yet never got a reply. Maybe I can luck out and get info this time around.

cheers

While I am interested in the outcome if anyone tries this I have my doubts it will be much of an improvement. The reason for this thought is that both HRC and Moriwaki used the CV carbs when they built the race VTRs. If the gain were so outstanding why didn't they use them?

Costly and little benefit?
I'd only use them with a turbo build.

Big benefit I reckon. I know a guy that had a set, and when I asked him the result his response was "More power everywhere".

The other factor is your intake. On the VTR we all know that you cannot remove the snorkel or put a bigger (oversize) airfilter in or remove the lid, as the bike runs like crap. But if you have carbs that do not require vacuum to operate then you can run a more open intake. More air = more power. The guy I know just ran pod filters with them.

As for why HRC and Moriwaki did not use them, who knows. Perhaps the racing regs did not allow a carb swap.

Just an FYI...

The guys with the DRZ400 love the FCR swap. The bike comes with a 36mm CV type carb, and we swap it out with a FCR39 mx. The swap is good for about 5hp, and once tuned, there are no dead spots, and the throttle response is instant. Also... the FCR is not affected by large bumps. (important while off-road)

The dirt only version of the bike came with the old slant style FCR from he factory, but the on/off road and SM versions got neutered by the EPA. (carb, lower compression, and cams)

I did the swap on my personal DRZ, and it was the best thing I've done so far. I know the Superhawk needs 2 of them... but if you are running on a track, it's worth the mod.


Attachment 28247

Going from a 36 mm CV carb to a 39 mm slide carb (as on the DR swap) is a HUGE change (as CV carbs, to get equivalent flow, are typically larger). In the case of the VTR, you`d be going from a 48 mm CV to a 41 mm FCR, more of an equivalent change.

its a different engine but I swapped FCR onto an older honda cb1100F a couple years ago - and have ridden a friends side by side. There is perhaps a bit more power, but its not very impressive. The biggest changes (good and bad):
good: immediate response since its direct life slide (of course too much lift and it bogs so slightly different riding still for WFO), loose ugly airbox (on the 1100 at least), much much easier to tune:make a lot of clicking as the slide slaps around with each power pulse at idle
bad: no choke, probably less of an issue on the SH, but on a cold blooded bike it makes starting and warm up more difficult; required changing the wire to sheath length of the throttle cable even though set up for the 1100f from sudco, expensive; make a lot of clicking!
overall, its neat to have them, but not sure of the overall benefit in a stock motor at least. of course loving to tinker with these thigns it would be very fun to try

intersting, I called Sudco and was told they couldn,t do it....

anyhow, I got a reply from my e-mal, here it is:
Hi Michael,

We can offer a kit using the Keihin FCR carbs in 41mm. There are 2 options, one using velocity stacks, the other airbox adaptors.

The prices are:
£1169.64+VAT and delivery.
£1352.39+VAT and delivery.

Quote reference is 11871.

Kind Regards,

Fran

Allens Performance Ltd
Unit B9
Moorbridge Road
Bingham
Notts
NG13 8GG


pretty expensive IMO

cheers

as of today 1200 pounds = 2000 USD.
And thats only 2 carbs!! I got all 4 for a quarter of that. they must know inline 4 guys are cheaper than Vtwin guys - all those ducatisti running up the costs!

Yep, waaaaaaay too much in my opinion....

The Moriwaki bile was running no air filter and ram air, so it can be done......

Yup... I don't think you would get $2k's worth of upgrade.

Here is a new one on Ebay starting at $400 US. The guy has a couple of them so it could be possible to get both for under a grand.http://cgi.ebay.com/ebaymotors/NEW-K...Q5fAccessories

Not sure if that would work as I think the ones made to be mounted at an angle are a slightly different design. You also have to consider the whole issue of fabricating the brackets to hold them together, as well as the linkage to have them open together. While not impossible, it could sure be a source of frustration.....

Those would be harder to make work. You need the downdraft version.

Bingo!

My bad, I didn't realize FCRs came in a sidedraft flavor. Here are some used ones for a Ducati monster http://cgi.ebay.com/ebaymotors/Ducat...item414b156394
I'm still on the lookout for some Mikuni TDMRs.

Or a challenge.:D Here is a conversion I did with 3 Mikuni HSRs on my Austin Healey.
https://www.superhawkforum.com/forum...5&d=1259773911

I have run a more open intake on my bike too. It made great power and felt fantastic when you cracked the throttle. It would have been great on the track, but it was no good on the street. You could not dial out the flat spots.

Have you ever had any experience with a HRC jet kit? It runs different needles (very rich) and blocks off an air jet in each carb. Mains end up in the 150 range from memory. The end result was the same though. Good on the track but not the street. This was in a friends bike, not mine. He reckons the flat slides were a big improvement.

found this on the net; fcr's installed and nice crankcase breather/ oil catch tank!


http://i45.tinypic.com/2q32g50.jpg

Not my Moriwaki bike. It has the stock filter and intake. The rest of the motor is the stage III build. The ram air bike was more of a test, it was a time bomb and didn't add much power.

Very true. I didn't mean to say that they were all that way. They did get it to run pretty good but the small gain wasn't worth the need for constant eng. rebuilds from sucking so much dirt. I onlt mentioned it because when I got the HRC jet ket set up notes from Bob H. it was listed as one of the set ups, of course he also said that you would be crazy to run it.

And yes he did say the stock filter and intake made the most power ;)

Mhhh... interesting!!!

I have 4 FCR 41 carbs (of my Kawasaki ZX-7RR)... i want to look if it's possible (and how...) install in the VTR engine...

i've also a modified carbon air-box in my VTR, so.........:rolleyes:

But i'm perplessed about the increase of performance: I have 2 Kawasaki ZX-7R model (1 R and 1 RR), the first have 39 carbs, the second 41 FCR: I've try to install in the R the FCR carbs, but at dyno the improvement was very low... the only difference, it's a very great throttle response... FCR are very "nervous", and need of a great work in air/fuel calibration, or go bad... According to the weather can go very well or very badly, from one day to another...

That is what my friend said too Rama. Work very well, but needed patience to set them up properly.