Author Topic: '72 CB500/4 : Project WTF was I thinking!? ...Time for some updates! (Read 51756 times)

Stev-o · « **Reply #100 on:** March 05, 2013, 05:08:27 AM »

I vote Lesters, great job on the paint work. Really like this build, Scott.

SOHC4 Cafe Racer Fan · « **Reply #101 on:** March 05, 2013, 07:46:46 AM »

Definitely the Lesters.

Scott S · « **Reply #102 on:** March 08, 2013, 01:17:22 PM »

Installed the carbs today. This was sort of a "hold your breath" moment because I wasn't sure if the petcock was going to clear the carbs. I KNOW there are some interference issues with the earlier style or CR carbs, and possibly with other tanks with different style petcocks.

Turns out it clears. Sort of....

In the "OFF" position, it's fine. In the "ON" position, it's fine. But getting between the two is going to be a minor problem.

We'll have to trim the tab on the lever just a tiny bit so it will clear the carb top. I also have to figure out a fuel "T" so I can go from two small outlets on the petcock to one larger inlet on the carbs. Shouldn't be a big deal.

Scott S · « **Reply #103 on:** March 08, 2013, 01:20:17 PM »

We also worked on fitting the seat. My Dad helped me trim off the hinge mounts...

....and we figured out how we're going to mount the seat. Here's a mock-up. I picked up some hardware today and we'll have to make to small brackets. We should have it all done in a few days and I can have the cowl painted to match the tank/side covers.

Scott S · « **Reply #104 on:** March 09, 2013, 05:03:32 PM »

I realized today that the manifolds have an arrow on them. I'm assuming that it points in the direction of flow. Well, as luck would have it, I only had ONE of them in the right direction.

Removed them and Dad "match ported the rubber lip inside to make a smoother transition between the carb body and head while we were at it.
Found out that my throttle cable will work, which is good since I have the lower 400F bars.

But the real bonus of getting the manifolds correct was finding out the petcock will now clear the carb tops. Yay! No grinding on the petcock lever!

Scott S · « **Reply #105 on:** March 09, 2013, 05:05:32 PM »

Did some more work on the seat mount (pics to come), and pulled the swing arm for new bronze bushings.
I hope to get the bearings in the wheels this weekend, too. It won't be long 'til the rear-end is done and I can start work on a few things up front.

chris mcshifty · « **Reply #106 on:** March 09, 2013, 07:54:23 PM »

Nice build where can I find those Henry Abes

RAFster122s · « **Reply #107 on:** March 09, 2013, 09:45:14 PM »

The CV carbs can be fiddly, a couple variants of the CV were used on the CX500/CX650 and GL500/GL650 motors.
Sirius Consolidated in Canada has some parts for the carbs if you have trouble finding sources.
Larry on the CX/GL forum has a pretty good carb guidance as he knows how to work magic with them. There are some basic guidelines he has published on them before creating the rebuild manual on them. An industrial ultrasonic cleaner works very well, the HF just doesn't have the power to do it right.

Here's a cutaway of the CV carb design...
http://globalcxglvtwins.forumlaunch.net/viewtopic.php?f=17&t=546

The CV carb basics are part here...

http://globalcxglvtwins.forumlaunch.net/viewtopic.php?f=19&t=32
Larry now recommends the Purple formula of the Simple Green that Home Depot carries for cleaning the carbs in the ultrasonic cleaner. Saves a lot of the other stuff with the traditional cleaners and CLR...

Good resources check them out.

David

Scott S · « **Reply #108 on:** March 10, 2013, 04:52:01 AM »

Quote from: chris mcshifty on March 09, 2013, 07:54:23 PM

Nice build where can I find those Henry Abes

Good luck with that. The last few sets on ebay sold for ~ $1200-1800! Just watch ebay and Craigslist.

Scott S · « **Reply #109 on:** March 10, 2013, 04:59:16 AM »

Quote from: RAFster122S on March 09, 2013, 09:45:14 PM

The CV carbs can be fiddly, a couple variants of the CV were used on the CX500/CX650 and GL500/GL650 motors.

Thanks, David. I used this as a guideline: http://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revD.pdf

The carbs I have came off a running bike. I gave them a good cleaning using some tips in the above link. Hopefully, I'll be OK. I'll see how well they respond to the K&N filters.
It's odd that you say they're finicky, as the CB650 guys seem to think the CV carbs are more forgiving. That's been my experience with CV type carbs on XS650's, too; they respond well to intake and exhaust changes.

Retro Rocket · « **Reply #110 on:** March 10, 2013, 04:04:36 PM »

I would use the HA wheels, i would also just move the tank a little when necessary to turn the petcock on or off, there's enough movement in the tank to do that, and last but not least, i prefer the stock seat....

Looks cool with the 650 shoe horned in there, i've been trying to convince Dave500 to do the same thing...

Scott S · « **Reply #111 on:** March 10, 2013, 04:09:54 PM »

The petcock clears now that I have the manifolds on correctly. Too late to turn back on the seat now!!

Retro Rocket · « **Reply #112 on:** March 10, 2013, 04:18:52 PM »

Quote from: Scott S on March 10, 2013, 04:09:54 PM

The petcock clears now that I have the manifolds on correctly. Too late to turn back on the seat now!!

Sorry i didn't look back in the thread, did you cut the mounts off ..?

Scott S · « **Reply #113 on:** March 10, 2013, 04:25:15 PM »

Just the part the hinge pins go through.

Goofaroo · « **Reply #114 on:** March 10, 2013, 05:08:58 PM »

Quote

I would use the HA wheels, i would also just move the tank a little when necessary to turn the petcock on or off, there's enough movement in the tank to do that, and last but not least, i prefer the stock seat.... Looks cool with the 650 shoe horned in there, i've been trying to convince Dave500 to do the same thing...

I agree. That thing looked slick as hell with the stock seat but you did a nice job on the custom seat. For what it's worth, I think the spoke wheels look great.

Great job on the project! It is very tastefully done.

RAFster122s · « **Reply #115 on:** March 10, 2013, 08:29:00 PM »

Quote from: Scott S on March 10, 2013, 04:59:16 AM

Quote from: RAFster122S on March 09, 2013, 09:45:14 PM
The CV carbs can be fiddly, a couple variants of the CV were used on the CX500/CX650 and GL500/GL650 motors.

Thanks, David. I used this as a guideline: http://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revD.pdf

The carbs I have came off a running bike. I gave them a good cleaning using some tips in the above link. Hopefully, I'll be OK. I'll see how well they respond to the K&N filters.
It's odd that you say they're finicky, as the CB650 guys seem to think the CV carbs are more forgiving. That's been my experience with CV type carbs on XS650's, too; they respond well to intake and exhaust changes.

When in good shape and tune, they work great. But, they are a pain with the press in emulsion jet for the idle circuit and are not forgiving of bad fuel.

I like to use a few capfuls of SeaFoam Motor Treatment as a fuel conditioner and it seems to help keep the carbs clean and happy and serves as a fuel stabilizer to a certain extent.

Scott S · « **Reply #116 on:** March 15, 2013, 06:27:09 PM »

New Hagons...

...and new swing arm bushings...

....were installed today. Cleaned and greased the swingarm assembly. In this pic, I was waiting to pick up some washers for the top shock mount.

Scott S · « **Reply #117 on:** March 15, 2013, 06:28:38 PM »

New EBC shoes in the polished hub. I'm a big fan of EBC brakes. I can really tell a difference when I install new EBC pads or shoes.

Scott S · « **Reply #118 on:** March 15, 2013, 06:32:39 PM »

Installed new All Balls sealed bearings in the Lesters and got them all assembled. I plan on dropping off the wheels and tires to be mounted and balanced tomorrow.

That's a 40T rear sprocket. If my math is correct, that and a stock 17T front will get me very close to the correct gearing for the CB650 engine.

dave500 · « **Reply #119 on:** March 15, 2013, 10:29:55 PM »

bloody good work man!itll be a real sleeper!

RAFster122s · « **Reply #120 on:** March 15, 2013, 11:02:40 PM »

No, with those Lesters it will be rolling bike porn...

Retro Rocket · « **Reply #121 on:** March 16, 2013, 12:18:32 AM »

The wheels look awesome but i'm not a fan of 15 tooth front sprockets, puts a lot of strain on the chain....Just saying...

Scott S · « **Reply #122 on:** March 16, 2013, 04:29:36 AM »

Quote from: Retro Rocket on March 16, 2013, 12:18:32 AM

The wheels look awesome but i'm not a fan of 15 tooth front sprockets, puts a lot of strain on the chain....Just saying...

Oops! Fixed that...it should have been 17T.

bwaller · « **Reply #123 on:** March 16, 2013, 04:42:31 AM »

Well done Scott, you've done a lot of work there.

Scott S · « **Reply #124 on:** March 16, 2013, 05:11:57 AM »

Quote from: bwaller on March 16, 2013, 04:42:31 AM

Well done Scott, you've done a lot of work there.

Thanks! I couldn't have done it without the help of my Dad. He's almost always there when there's heavy lifting involved!

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Author Topic: '72 CB500/4 : Project WTF was I thinking!? ...Time for some updates! (Read 51756 times)