Triumphrat

2112

and any others whom may know. Imput from all will be appreciated.

I'm interested in the Keihin CR special Race Carbs
(35 mm smooth bore)

Does anyone here have any experience with this carb set?

My intended application would be on a 865cc with sprint mufflers and a NARK. I would also include a pringle hi-flow fuel tap and hi-po cams. Would the addition of this carb set make a clear difference in performance or would it be to much for stock displacement?

I've seen in a post that another member is using flat side carbs. I hear they are the true way to go but also difficult to dial in.

Would there be another carb selection that can be better.

I hate the effect of CVK carbs...sluggish response. I think I want this to be my next upgrade without going big bore.

sweatmachine

yep, those are the ONLY aftermarket carbs to consider.

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Click for a picture of my slightly modified Bonnie

2112

I checked out the carb set up on Bonneville performance and it looks the part but price wise I can't afford.

If I was to go with the CR 35mm smooth bores can someone speculate as to what kinda dyno numbers I could expect with the above mods?

Do you think I would be disappointed in the product?

Does anyone that actually has these on there bike comment?

SCCTrim

In your initial post you state you'd like to have some hi-po cams installed, I'm curious where your getting them from as well as the dyno sheet's for these cams. Have they been tested on a independant 3rd party dyno?

I'm asking you this because there isnt anyone I'm aware of that is backing up claims of horsepower gains on a 3rd party dyno. As far as cam's are concerned, you arent going to find a better cam than a 790cc setup for topend power versus cost. You could theoretically advance your exhaust cam to simulate the 790cc exhaust cam specs, but I dont know anyone that has done this...in theory it should work.


Cam's seem to be in the neighborhood of 8 bill's or maybe more, your money would be far better spent on a big bore kit. It isnt the minimal increase in cc's thats the benefit, it's the added compression. Expect roughly 10 horses at the rear wheel from a bigbore kit.

As for carbs, the cr's are old news man. While they will outperform a cv carb, they are the same size as the cvk's. While the mikuni's are kinda expensive, they are a great power builder as well as being pretty easy to tune. I'm using these carbs with a stock fuel tap.

Expect roughly 10 horses at the rear wheel from adding these carbs...either before or after the bigbore kit. They perform well on stock bore engines.

You could take the money you would spend on cr carbs and cams...and have either a bigbore or the mikuni kit installed and have verifiable gain's on your machine...cams wont get you 10 horses.

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vertwrks

Take your cam money and your CR money add them together and you have Mikuni HSR42's.....

I don't have mine yet but soon, very very soon.

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04 Bonneville w/904 kit, 1mm over valves, ported, ARK'd, Bub's, HSR 42's, F3 forks, kyb rear shox, F3 clip ons, Brembo M/C, 6 pot caliper, 17" Excel's, this & that

mikeinva

I just put the Mikuni on mine and good luck getting the cr carbs i dont think you will have much lucking finding anyone that has a set in stock.

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PaleForce

I clicked on that Bonneville Performance link, and one of the pics there caught my attention...



That "bell mouth" thing in the place of the air filter... I've seen that before, but honestly, I don't have the slightest clue what it is. Unless they're just runnin' fresh air through that thing without sending it through a filter, I don't know what that is.

Anyone know, or perhaps a have a really good guess?

SCCTrim

It is a velocity stack with a fine mesh screen for filtering, I dont run these on my setup..nor have I seen anyone else running them.

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Hated By All....cause thats just how it is.

grayghost

Yes, those are velocity stacks and you DON"T WANT TO RUN THEM! They were used back in the day on performance machines with a metal grid over them to keep the big "hunks" out.

There is absolutely NO AIR FILTRATION. You will seriously lessen the life of your engine. I read somewhere over the last while it takes only about 25 - 30 grams of fine grit introduced into an engine to do it serious harm.

The stacks are beautiful though in their simplicity.

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2112

Thanks for the info especially to SCCTrim and Sweatmachine.
Your opions and info are respected.

I guess I just need to save my money for the flat slides, sounds like the CR's are almost a waste of time. Also
I need to admit, those flat slides look sexy!

The Sprints and NARK should be here any day.