Author Topic: Dry clutch on CB750 (Read 131823 times)

turboguzzi · « **Reply #525 on:** March 09, 2011, 01:47:42 PM »

Quote from: paulages on March 09, 2011, 01:41:58 PM

Quote from: voxonda on March 09, 2011, 12:54:32 AM
Hi Paul,

Maybe you're right. I am not into 500/550. But years ago I helped someone out who had a dry one on his 500. Cannot seem to recall how it was build.

Rob

I'd love to see one!

here ya go

short memory you've got....

http://forums.sohc4.net/index.php?topic=37074.0

paulages · « **Reply #526 on:** March 10, 2011, 10:18:47 AM »

Yeah, yeah Yossef...

Isn't most of that bike mystery? It's hard to tell from the pictures how they worked their way around the primary/clutch gearing..

Syscrush · « **Reply #527 on:** March 10, 2011, 10:47:57 AM »

So, the short story is that this mod would have to be worth over $2000-3000 to me to even entertain the idea, yeah? If something like a 750SS dry clutch could be made to work for a total budget of $1k, I'd look at it pretty hard. At the $2k for parts alone plus a bunch of machining etc. pricepoint, it's outside the scope of my project.

wannabridin · « **Reply #528 on:** March 10, 2011, 11:02:44 AM »

i sure hope it's not 2-3K!! otherwise i'll be using the stock clutch...

i can probably work with a max budget of 1k, although i've been mentally preparing myself for 5-600 or so. i bet Rob has quite a few people who would like to buy one, as he knows a bunch on here and the racing circuits! hopefully my lower end guess is the right one!!

Howell · « **Reply #529 on:** March 10, 2011, 11:17:18 AM »

CB500 with dry cluth and the alu plates.

Syscrush · « **Reply #530 on:** March 10, 2011, 12:02:31 PM »

Quote from: Howell on March 10, 2011, 11:17:18 AM

CB500 with dry cluth and the alu plates.

That looks sooooo bad.

CB500Four · « **Reply #531 on:** March 10, 2011, 03:53:44 PM »

Here are some little bit more pics of the dry clutched CB500.

http://forums.sohc4.net/index.php?topic=63940.msg848358#msg848358

I think the plate which is mentioned by René doesn´t belong to the shown CB500.
But it looks and works very similar.
In my opinion the mainshaft is the weaky point. Probable it is a little bit too short.

Regards, Heinz

voxonda · « **Reply #532 on:** May 19, 2011, 10:39:37 AM »

While racing(?) my 'test-rig', had a wonderful time tho had a minor issue with the clutch, but could solve it on site.
Tho carburation was a bit of, she ran like a beauty without any problems. Clutch can handle this 'power' easy. Next week clutch will be used in stronger engined CR836/CR31 etc.etc. During festival at Dijon France.

Minor adjustments to carbs and clutch.

Once past 4k she really flew. A lot of potential in her.

Sam Green Racing · « **Reply #533 on:** May 19, 2011, 11:42:22 AM »

Rob, the last picture reminds me of the start of the 1970 Daytona race and Dick Mann.

Nice pics young fellow.

Sam.

Syscrush · « **Reply #534 on:** May 19, 2011, 11:48:27 AM »

Very nice.

mcpuffett · « **Reply #535 on:** May 19, 2011, 11:53:04 AM »

Bet you'd go faster without that barn door strapped to the front eh Rob

, cheers Mick.

Sam Green Racing · « **Reply #536 on:** May 19, 2011, 12:12:33 PM »

It disappears when it gets over 75mph Mick.

Sam.

voxonda · « **Reply #537 on:** May 19, 2011, 01:43:04 PM »

Quote from: SamCB750A on May 19, 2011, 11:42:22 AM

Rob, the last picture reminds me of the start of the 1970 Daytona race and Dick Mann.

Nice pics young fellow.

Sam.

Thanks Sam, consider that a honour. Once I got grip of that, very tight, corner onto the straight and keeping her around/above 4k she went ballistic. LOL

Cheers, Rob

voxonda · « **Reply #538 on:** May 19, 2011, 01:46:53 PM »

Quote from: mcpuffett on May 19, 2011, 11:53:04 AM

Bet you'd go faster without that barn door strapped to the front eh Rob , cheers Mick.

Hey Mick,

Since Croix is such a short circuit ( real M.Mouse like) I prefer the straight bars and the AMA-style #plate. Have a very slick fairing for faster tracks, but like the sit up and beg (thanks CROZ) style more.

Cheers, Rob

voxonda · « **Reply #539 on:** May 19, 2011, 01:53:43 PM »

Since re-adjusting the carb's, it runs so much better. Changed the mains to 1.50 and lifted the needles to the mid position. Now she idles at 1200rpm, and still have to synchronize the carb's. Now hoping for the TinTop filter unit and making a baffle for the Yoshi rep and hoping to put some public road miles on her.

wannabridin · « **Reply #540 on:** May 19, 2011, 02:07:03 PM »

awesome news Rob!! looks like a fun day!!

any chance you took a video?

bwaller · « **Reply #541 on:** May 19, 2011, 02:12:08 PM »

Those number plate holes originally for the cooler might actually help air cool the "boys" on a hot day Rob.

voxonda · « **Reply #542 on:** May 19, 2011, 02:26:39 PM »

Quote from: wannabINDUSTRIdin on May 19, 2011, 02:07:03 PM

awesome news Rob!! looks like a fun day!!

any chance you took a video?

Hey G, Unfortunaly no vid's. This tastes for more!

Cheers, Rob

voxonda · « **Reply #543 on:** May 20, 2011, 12:41:14 PM »

Since I am fiddling with the carb's I thought I'd better take a set of K7 carb's apart to have some spares, just in case.
What I found puzzled me a bit. Have to say am no expert on the PG carb's. But when dissambling the carb's I found the needles and jets and jettube in very good condition. But when I opened up the top and removed the slides I felt a weight difference. And the appereance of the slides looks like anodised aluminium. I took apart a F2 carbslide and again the weight difference puzzled me. I took a electric scale and weighed them both. The F2 complete slide, with needle 105.4 gram. Then the K7, same assembly, 45.8 grams.
Anyone can fill in?

Rob

Sam Green Racing · « **Reply #544 on:** May 20, 2011, 01:59:29 PM »

Sounds like the F2 is made of lead and the K7 magnesium.

Come on the carb experts

Sam.

voxonda · « **Reply #545 on:** May 21, 2011, 12:37:04 AM »

Just to show:

DannyBhoy · « **Reply #546 on:** May 21, 2011, 04:53:27 AM »

Well that's neat to know. This project just keeps getting better. I just came across it yesterday, late for work, stayed up late ( missed hockey playoffs, which I will have to go to church for), got up early and now am up to pg 22 and ready for more.
Great work Rob, especially with this young lad from Texas holding a gun to your head. Talk about grace under pressure. Yanks want everything NOW, like driver thur, LMAO. Sorry to take the piss out you Wannab. Your excitement and energy level is to be admired.
Cheers and Happy Victoria Day to all. That's the Canadian holiday to celebrate our beloved Queen and sovereign's birthday. We have all buy 24's and sit around camp fires and get lit up.

turboguzzi · « **Reply #547 on:** May 21, 2011, 06:01:44 AM »

heavy = chromed brass

light = either ally or mazak / zamak type alloy

voxonda · « **Reply #548 on:** May 21, 2011, 06:41:49 AM »

TG, I only knew the (heavy) chromed brass pieces, did not know Honda did them differently. Seen a lot of carb's but not with these slides.

Cheers, Rob

754 · « **Reply #549 on:** May 21, 2011, 10:12:19 PM »

One type of those 2 different slides uses an adjustable needle jet, the other has a fixed one.

News:

Author Topic: Dry clutch on CB750 (Read 131823 times)