Author Topic: The Hot Mess - 1975 CB550F1 Frame/1981 CB650 Engine (Read 128281 times)

slikwilli420 · « **Reply #550 on:** February 06, 2017, 10:20:34 AM »

No doubt a nice piece for a disc conversion, but for that kind of coin why not just use a flat track hub? The one I am going to use on my race bike weighs as much as just the cush drive from the 750 rear wheel.

SOHC4 Cafe Racer Fan · « **Reply #551 on:** February 06, 2017, 10:27:50 AM »

Quote from: calj737 on February 06, 2017, 10:07:29 AM

So the word is 2 pounds heavier than stock fully assembled. But for the improvements, I'll suffer.

Me, too.

tshrey · « **Reply #552 on:** February 06, 2017, 10:46:09 AM »

What kind of bike do I need to go steal the disc, caliper and master cylinder off of?

SOHC4 Cafe Racer Fan · « **Reply #553 on:** February 06, 2017, 10:53:02 AM »

Quote from: tshrey on February 06, 2017, 10:46:09 AM

What kind of bike do I need to go steal the disc, caliper and master cylinder off of?

Brembo P32 or P34 caliper. Check Devin's site for the rotor options.

SOHC4 Cafe Racer Fan · « **Reply #554 on:** February 07, 2017, 05:13:17 PM »

Yessss!!! My Cognitomoto disc hub is on its way West!

SOHC4 Cafe Racer Fan · « **Reply #555 on:** February 07, 2017, 05:24:01 PM »

Quote from: calj737 on February 07, 2017, 05:21:06 PM

Oh, by the way, you should hear the nasty names Devin was calling me yesterday! I merely suggested that in order to reduce weight he considered offering these hubs in magnesium. Thought I had inadvertently reached a Sailor's head from the language

I can only imagine how a block of magnesium that size as a blank would increase the cost but, yes, it would be light.

SOHC4 Cafe Racer Fan · « **Reply #556 on:** February 27, 2017, 02:06:44 PM »

Oops! I posted this in my other build thread, so here in comes again! My new Cognitomoto rear disc hub:

IMG_0883_zpszolcgai3 by Donald Leonhardt, on Flickr

IMG_0884_zps2kftquq3 by Donald Leonhardt, on Flickr

IMG_0885_zpsy1ylfq5o by Donald Leonhardt, on Flickr

Swapped the caliper, too.

IMG_0830_zpstixawtk0 by Donald Leonhardt, on Flickr

The machining is exquisite!

2 lbs heavier than a stock drum hub, but lighter than a CB750F disc hub (with disc and caliper, because the old hefty rotor, caliper and bracket).

SOHC4 Cafe Racer Fan · « **Reply #557 on:** February 27, 2017, 02:07:23 PM »

Ordered the rims, spokes and tires, too!

SOHC4 Cafe Racer Fan · « **Reply #558 on:** February 27, 2017, 05:51:09 PM »

This is the one that was catching all the drool when you picked up yours!

There's even some pencil handwriting on it that says, "Cal was here."

Restoration Fan · « **Reply #559 on:** February 27, 2017, 06:00:48 PM »

That is sexy as can be, Don!

SOHC4 Cafe Racer Fan · « **Reply #560 on:** March 03, 2017, 10:11:19 AM »

Parts starting to trickle in for the wheels. I also ordered the aluminum sprocket for the rear wheel (from Cognitomoto) to shave a pound or two.

bwaller · « **Reply #561 on:** March 04, 2017, 08:36:35 AM »

520 chain (& sprockets) saves weight too and takes less juice to spin. Come on Don dig deep.

What a prick huh?

SOHC4 Cafe Racer Fan · « **Reply #562 on:** March 04, 2017, 09:10:07 AM »

Quote from: bwaller on March 04, 2017, 08:36:35 AM

520 chain (& sprockets) saves weight too and takes less juice to spin. Come on Don dig deep.

What a prick huh?

Yes (as to the 520). Fortunately, Devin sells conversion sprockets (front and rear).

bwaller · « **Reply #563 on:** March 04, 2017, 11:48:25 AM »

Oh well done. I was joking of course but 520's are more than enough chain plus the combined weight savings including alloy rear sprocket is significant. They obviously won't last as long as a steel 530 but good chains and hard anodizing helps.

Retro Rocket · « **Reply #564 on:** March 04, 2017, 04:25:59 PM »

Quote from: bwaller on March 04, 2017, 11:48:25 AM

Oh well done. I was joking of course but 520's are more than enough chain plus the combined weight savings including alloy rear sprocket is significant. They obviously won't last as long as a steel 530 but good chains and hard anodizing helps.

I'm currently changing my 750 Kawasaki from 630 to 520, the 520 I'm using is stronger and far lighter than the 630, My friend has a 520 conversion on his GSXR1000 and he's the importer for the chains and sprockets {all sizes}...

FunJimmy · « **Reply #565 on:** March 04, 2017, 08:18:32 PM »

Quote from: CB750 Cafe Racer Fan on February 27, 2017, 02:06:44 PM

My new Cognitomoto rear disc hub?

The machining is exquisite!

2 lbs heavier than a stock drum hub, but lighter than a CB750F disc hub (with disc and caliper, because the old hefty rotor, caliper and bracket).

Exquisite is right. That's some serious programming.
Any reason why Devin didn't increase the distance between the spoke flanges?
There should be lots of room to move them out. Much stronger wheel and better suited to wide rims.

SOHC4 Cafe Racer Fan · « **Reply #566 on:** March 04, 2017, 10:03:01 PM »

Jim,

I'm not sure. I can only surmise he kept it stock for overall fitment with the cush drive and spacers. Cal might have more insight as he was the squeaky wheel that persuaded Devin to make the 550/750 hubs.

FunJimmy · « **Reply #567 on:** March 05, 2017, 08:31:55 AM »

Quote from: calj737 on March 05, 2017, 04:02:06 AM

Stock fitment. This hub is far stronger than stock already. Wide rims don't require different spacing on the spoke flange because the rim is centered tensioned, remember. If you spread the flanges, you'd need completely different hole geometry and likely non-stock spokes, and then you'd have to modify the Cush drive. No point, no value in it.

Ya I don't see it that way. Strength of the hub wasn't (isn't ) an issue. You are right that wide rims don't require wide spoke flange spacing but it does create a stronger wheel. The wheel assembly benefits from wide spoke flange spacing not the rim. Anyone purchasing this hub and building a wheel will purchase NEW correct length spokes so that's covered. As far as I see it, the cush drive need not change to accommodate wider spoke flanges. I could demonstrate what this hub would look like with wide spoke flanges in minutes with Photoshop. The only sacrifice may be the symmetrical "V" shape of the flange centre due to the cush drive hub. Maybe that's the issue. Form over function.

SOHC4 Cafe Racer Fan · « **Reply #568 on:** March 14, 2017, 10:15:25 PM »

New hoops (and spokes) from Buchanan's arrived!

IMG_1066_zpsbsgrfrik by Donald Leonhardt, on Flickr

SOHC4 Cafe Racer Fan · « **Reply #569 on:** March 15, 2017, 08:02:03 PM »

Just got my sprockets, too. 520 front and rear with offset for the larger meat on the rear.

riverfever · « **Reply #570 on:** March 15, 2017, 08:03:41 PM »

Quote from: CB750 Cafe Racer Fan on March 15, 2017, 08:02:03 PM

sprockets

Now is the time we dance.

SOHC4 Cafe Racer Fan · « **Reply #571 on:** March 15, 2017, 08:04:32 PM »

Quote from: riverfever on March 15, 2017, 08:03:41 PM

Quote from: CB750 Cafe Racer Fan on March 15, 2017, 08:02:03 PM
sprockets

Now is the time we dance.

SOHC4 Cafe Racer Fan · « **Reply #572 on:** March 16, 2017, 07:25:45 AM »

Nothing too large.

Restoration Fan · « **Reply #573 on:** March 16, 2017, 04:43:05 PM »

Quote from: CB750 Cafe Racer Fan on March 16, 2017, 07:25:45 AM

Nothing too large.

That's what she said?

Restoration Fan · « **Reply #574 on:** March 16, 2017, 06:57:56 PM »

Don, I have found the final piece for this bike.
Go this link and then type in 121G in the search window...seriously, just do it. This is what all of us wish we could have for our bikes!
http://www.oreillyauto.com/site/c/home.oap

News:

Author Topic: The Hot Mess - 1975 CB550F1 Frame/1981 CB650 Engine (Read 128281 times)