Author Topic: cb750 dual disc conversion question (Read 3918 times)

.RJ · « **on:** December 12, 2007, 04:29:13 PM »

Question on getting everything lined up here -

The caliper just bolted to the fork

The caliper spaced out 3mm from the fork (looks correct)

Caliper installed - the spring, and the bolt that goes inside of it is now too short - there's no tension on the spring and the bolt doesnt go through the mount.

Anyone else had similar issues?

Left side, for comparison:

bwaller · « **Reply #1 on:** December 12, 2007, 04:45:55 PM »

Use a longer 6mm bolt and make one to suit.

754 · « **Reply #2 on:** December 12, 2007, 04:53:23 PM »

Toss the springs and adjusters.. dont need them.

Are you not going to move your brake line fitting to the back?

.RJ · « **Reply #3 on:** December 12, 2007, 04:55:25 PM »

Quote from: 754 on December 12, 2007, 04:53:23 PM

Toss the springs and adjusters.. dont need them.

Interesting, I never thought of that. Does the spacing look correct?

Edit - the bleeder is in the wrong place.

.RJ · « **Reply #4 on:** December 12, 2007, 05:30:25 PM »

The more I look at this, the more I like the single disc and CL350 fender. So simple.

Cyclone · « **Reply #5 on:** December 12, 2007, 05:32:28 PM »

.rj, just mailed you a doc w/pics....cyclone

FunJimmy · « **Reply #6 on:** December 12, 2007, 10:29:22 PM »

Might be an optical illusion but the caliper bracket doesn't look tightly fastened to the fork.

KB02 · « **Reply #7 on:** December 13, 2007, 05:16:45 AM »

I know that it's been said a few times before (in other posts on the conversion) that since the only one side was used for the brakes at the factory, that unused side received very little attention for brake fit and finish. Basically, I don't find it unusual that you need the spacer as you are the first one to put a brake on the right side of that particular bike.

bbrown · « **Reply #8 on:** December 13, 2007, 05:30:01 AM »

go to www.salocal.com/sohc/sohc.htm go to Dual Disc Conversion and view, hope this helps. Bob

.RJ · « **Reply #9 on:** December 13, 2007, 05:56:26 AM »

Quote from: bbrown on December 13, 2007, 05:30:01 AM

go to www.salocal.com/sohc/sohc.htm go to Dual Disc Conversion and view, hope this helps. Bob

That one's in the FAQ here

I punted last night, took the 2nd disc off and put it back together. I'll ride it as is and if I feel like I need more brakes then I'll put 'em on. That 2nd disc adds a lot of weight to the front wheel too!

bryanj · « **Reply #10 on:** December 13, 2007, 05:59:50 AM »

That article is OK EXCEPT it sez the 500 drive plate fits straight on SORRY IT DON'T 500 and 750 are identical parts! the one that fits is the VERY early 750 that is long obsoleted.
Should any body need them i have pictures of both types alongside each other so you can see how to modify.

.RJ · « **Reply #11 on:** December 13, 2007, 06:03:09 AM »

Quote from: bryanj on December 13, 2007, 05:59:50 AM

the one that fits is the VERY early 750 that is long obsoleted.

I believe thats the one I have - fits right inside the disc.

BulleyCafe · « **Reply #12 on:** December 13, 2007, 08:51:40 AM »

You can use the existing larger speedo drives, just take a grinder and pretty much remove the entire outer lip. Mine had a tendency to work itself loose after a while and slip on the rotor, a little dab of JB weld and the speedo never gave me any trouble after that. I had to also use a different variety of spacers to get the front disc to line up correctly, it is a giant pain in the rear to get that second disc to seat just right, too much and it will lock up, too little and it wont brake at all. Good luck, and make sure you have plenty of brake fluid for bleading, would have been a lot easier if I had someone around to help.

newcbguy · « **Reply #13 on:** December 13, 2007, 09:44:58 AM »

Is there a fender like the cl350 that will fit on the cb750 sandcast forks? I really hate the fender braces $:-\$

GNXFan · « **Reply #14 on:** December 13, 2007, 09:46:27 AM »

Yeah the 500 drive doesn't fit as stated above. What kind of tires are those in the pics? I like the tread pattern.

754 · « **Reply #15 on:** December 13, 2007, 09:54:00 AM »

They will look lighter drilled, the second disc can make a huge difference at high speeds.

But they are very very heavy, you could look at lighter discs or two calipers on one maybe or a 4 piston caliper.. these discs could take a lot of heat...

.RJ · « **Reply #16 on:** December 13, 2007, 09:55:59 AM »

Quote from: GNXFan on December 13, 2007, 09:46:27 AM

Yeah the 500 drive doesn't fit as stated above. What kind of tires are those in the pics? I like the tread pattern.

Pirelli sport demon

Quote from: 754 on December 13, 2007, 09:54:00 AM

But they are very very heavy, you could look at lighter discs or two calipers on one maybe or a 4 piston caliper..

Would be nice to fit a 4piston from a newer honda sportbike, RC51, CBR, etc.

hymodyne · « **Reply #17 on:** December 13, 2007, 10:04:37 AM »

Quote from: bryanj on December 13, 2007, 05:59:50 AM

That article is OK EXCEPT it sez the 500 drive plate fits straight on SORRY IT DON'T 500 and 750 are identical parts! the one that fits is the VERY early 750 that is long obsoleted.
Should any body need them i have pictures of both types alongside each other so you can see how to modify.

I'd like a look at those pics, as I'm in the beginning stages of a dual dice conversion right now...

hym

.RJ · « **Reply #18 on:** December 13, 2007, 10:21:15 AM »

Quote from: hymodyne on December 13, 2007, 10:04:37 AM

I'd like a look at those pics, as I'm in the beginning stages of a dual dice conversion right now...

Same article here - http://www.sohc4.net/index.php?title=Dual_disc_conversion

Good luck

I'm going to stick with 1 disc for now.

hymodyne · « **Reply #19 on:** December 13, 2007, 10:36:08 AM »

many thanks for the link.

hym

754 · « **Reply #20 on:** December 13, 2007, 05:28:09 PM »

just make an adaptor.

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Author Topic: cb750 dual disc conversion question (Read 3918 times)

BulleyCafe

newcbguy