Author Topic: Just joined the CR29 club (Read 7607 times)

Captaindonutbikes · « **on:** July 28, 2010, 04:36:58 AM »

I am running a cb 550 k3 and just took delivery of a brand spanking set of smooth bores.

offered them up and they are well out for the standard rubbers, do i need to change the rubbers/intakes or move the carb bodies in ?

cheers in advance

Sam Green Racing · « **Reply #1 on:** July 28, 2010, 05:33:03 AM »

No doubt you will get a reply during the night from one of our American brothers.

When is your website going to be up and running and how's the Italian bird making out.

Sam.

Captaindonutbikes · « **Reply #2 on:** July 28, 2010, 07:10:47 AM »

italian is super fine, but getting impatient.

(she is pretty good tho)

so whats the deal with the rubbers bro ?

the 550 k3 does not line up, and i have seen on other threads people running different rubber mounts for the carbs.

what are these ?

cheers

Captaindonutbikes · « **Reply #3 on:** July 28, 2010, 07:14:07 AM »

tried putting this on the english forum but it has disappeared !

Sam Green Racing · « **Reply #4 on:** July 28, 2010, 07:17:56 AM »

It's off line at the moment and I don't know anything about the smaller 4s.
You'll probably get a reply later tonight when the US guys get home from work, it's 9.15 in the morning over there.

Sam.

Sam Green Racing · « **Reply #5 on:** July 28, 2010, 07:23:14 AM »

Check out this thread, it might be of some use.

http://forums.sohc4.net/index.php?topic=42903.0#top

Sam.

Captaindonutbikes · « **Reply #6 on:** July 28, 2010, 07:26:00 AM »

CB750 (SOHC) VM29/A2HSM set of 4. 005-026
For mounting aftermarket performance carburetors to CB750 (SOHC) from 1969 to 1978 SOHC models.

think these are the ones i need but not sure, shall wait for the american guys to answer.

Captaindonutbikes · « **Reply #7 on:** July 28, 2010, 11:01:26 AM »

BUMP!

MCRider · « **Reply #8 on:** July 28, 2010, 12:05:28 PM »

Quote from: Captaindonutbikes on July 28, 2010, 07:26:00 AM

CB750 (SOHC) VM29/A2HSM set of 4. 005-026
For mounting aftermarket performance carburetors to CB750 (SOHC) from 1969 to 1978 SOHC models.

think these are the ones i need but not sure, shall wait for the american guys to answer.

I may be way off base here, but as an owner of VM29s they are not the same as the CR29s, pretty sure. Don't know about the rubber manifolds though.

Captaindonutbikes · « **Reply #9 on:** July 28, 2010, 12:19:48 PM »

yep just realized what i had posted. thanks any how

fastbroshi · « **Reply #10 on:** July 28, 2010, 08:28:28 PM »

You might wanna PM member Goddfrey, he's got some on his 550. Sounds like a custom job though (quote from Goddfrey in the Inspiration Gallery:

"The build is shown here: http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Richards-Cafe-project/
I also had questions regarding the CR carbs, It took some doing to get SUDCO to make a set for the CB550 and get the intake mainofolds right (had to use CB500) but I'm loveing them & just need to tweek the jetting now. Call Mike "AKA Dude" at 1-414-588-3106 or cycletunewisconsin@sbcglobal.net"

Captaindonutbikes · « **Reply #11 on:** July 29, 2010, 05:19:49 AM »

link does not work

Godffery · « **Reply #12 on:** July 29, 2010, 10:13:31 AM »

Quote from: Captaindonutbikes on July 29, 2010, 05:19:49 AM

link does not work

Try this one:
Café overkill project http://tinyurl.com/23udf4f

turboguzzi · « **Reply #13 on:** July 29, 2010, 11:13:17 AM »

running 29's on my racer which has essentially the same head as yours and you'll definitely need to craft custom inlet stubs to fit them.

most do a big flanged thing on a lathe.

you might find pics of such setup in my cb500 racer development thread and in howell's posts.

Is it a street bike? If yes, then I am not sure about the wisdom of running CR29's on the street on a 500/550, specially with stock porting, cams and compression. They might work well on street 750 but on a small block 500/550 you'll need to pull pretty high rpm to get flow speed (and response). Hope I am not spoiling your party....but you better hear that now than after doing all the work.

TG

bwaller · « **Reply #14 on:** July 29, 2010, 11:49:10 AM »

I have to agree TG.

I can't understand how 29's an a stock 550 would be very streetable. I could never get a mostly stock one to run decent with Keihin 28mm (stock CB750) carbs back in the day. These 29's are night & day ahead of the 28's.

Godffery · « **Reply #15 on:** July 29, 2010, 12:18:32 PM »

Oh man 29's... I missed that little detail; Yes, I agree; 29's would be way too much. I'm running the CR26's on mine and that's with a hotter cam.

BTW; as for the spigots, I talked to the dealer / shop I got my Carbs from and he said that he DID turn them down on a Lath to modify the fitment.

bwaller · « **Reply #16 on:** July 29, 2010, 12:28:51 PM »

That makes more sense.

Howell · « **Reply #17 on:** July 29, 2010, 12:49:54 PM »

Quote from: bwaller on July 29, 2010, 12:28:51 PM

That makes more sense.

To fit the CR's on the CB500 head you have to buy or make new intake manifolds.
But we did some more work to fit them.
On our racer we use them of Takegawa made for Honda minibikes.
See the pictures how they are fit.

Godffery · « **Reply #18 on:** July 29, 2010, 12:50:13 PM »

Another update:
I looked a little deeper into those intakes I used; I was totally wrong! I got them mixed up with some others I had on the shelf; there from a 1978 550. http://www.bikebandit.com/houseofmotorcycles/1978-honda-motorcycle-cb550k/o/m9449 NOT CB500...! man I feel like an idiot. The 77-78 are shorter & don't have the tuning ports because Honda used different Carbs for those years. http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Cafe+Overkill/DSC+274.JPG.html

Captaindonutbikes · « **Reply #19 on:** July 29, 2010, 03:34:56 PM »

so drilling and tapping the manifolds are the best way for doing sync on these problematic bad boys ? i know they will be a nightmare in this current set up but its a start!

would it be worth running a 650 cam with them ?

the list goes on.

thanks everyone for your as always invaluable help

Captaindonutbikes · « **Reply #20 on:** July 29, 2010, 03:42:37 PM »

oh and for the ~~non believers~~ i quote traveller:

'so, 120 mains with velocity stacks and an open 4-1 are good on an otherwise stock 550!'

Godffery · « **Reply #21 on:** July 29, 2010, 11:28:53 PM »

Yes I think installing the tuning nipples were a must but not because I think there problematic, I'm just kind'a anal.
I've here real good things about the 650 cam trick, the only draw back is that you have to use a CB750 tach because the tack drive gear is different.

As for the main jets, 120's work well in stock Carbs with velocity stacks and an open 4-1. as for the CR Carbs, probably closer to 110 or so, I'll let you know when I get mine dialed in.

Captaindonutbikes · « **Reply #22 on:** July 30, 2010, 04:24:45 AM »

cool.

the tuning nipples are because there are no vacuum points on the cr's to do sync right ?

Captaindonutbikes · « **Reply #23 on:** July 30, 2010, 07:54:09 AM »

Carbs all fitted, must have been having one of those f*ckwitt days, thanks for everyones help.

Just need to know about drilling the manifolds ?

Godffery · « **Reply #24 on:** July 30, 2010, 09:34:23 AM »

Right.

The only thing critical is to make sure there positioned as not to interfear with the mounting and easy reached for plugging in the vacuum gauge. As for the Nipples them selves; I got mine at Dennis Kerk.
If you have never drilled & taped, you may want to have some expert help with that part.
Also, using blue lock tight when installing them will insure a air tight seal on the threads.

News:

Author Topic: Just joined the CR29 club (Read 7607 times)