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CX Customization and Modifications
Started by lifeon2whls at 06-04-2009 11:00 PM. Topic has 24 replies.
  
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 06-04-2009, 11:00 PM
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lifeon2whls
 
Joined on 09-11-2006
Burbank, CA
Posts 74
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When I swapped the caliper on my CX to the dual piston CB900 caliper, there was a bit of mystery around the process for some reason. So I decided to do a write up and post whatever knowledge I could dig up. Enjoy: http://2wheels2nuts.blogspot.com/2009/06/cx500-project-cb900-brake-swap.aspx
If you have anything additional that I may have forgotten let me know.
Check out my motorcycle blog: http://2wheels2nuts.blogspot.com
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06-05-2009, 12:12 AM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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Looks pretty good. Guess the bracket is the key.
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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06-05-2009, 6:14 AM
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RodW
Joined on 02-18-2008
Posts 33
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If you think one disc and one CB900 twin pot caliper is good you should try the full CB900 set up with both discs and calipers. Swapped mine a few years ago and its a big improvement. I actually find this set up easier to use and wouldn't want to go back to the standard brakes. I did for a short while when the new, supposedly genuine Honda, seals in the CB900 calipers failed. Put the old brakes back on until I could get another set of seals and it was scary!
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06-05-2009, 8:21 AM
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kingston73
Joined on 04-19-2008
Bellingham, MA
Posts 1,722
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Did you/can you use the CB900 disk? Where did the ventilated disk in the picture come from?
1979 cx500D - mostly stock
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06-05-2009, 2:47 PM
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lifeon2whls
Joined on 09-11-2006
Burbank, CA
Posts 74
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I wanted to go with the dual disc setup but when I swapped everything I was still living in an apt. I was able to do the caliper swap without issue there but didnt have access to everything I needed to pull the wheels, get the proper fork, etc.
As far as the wheel that is pictured...I found that one online. I havent had time to take a picture of mine with the caliper on it so that was a quick solution. The person whos bike that was...if I remember correctly...did swap the rotor as well.
Check out my motorcycle blog: http://2wheels2nuts.blogspot.com
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06-06-2009, 6:52 AM
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RodW
Joined on 02-18-2008
Posts 33
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I had the advantage that my bike came with twin discs as standard. These discs are only 240mm diameter while the CB900 discs are 280mm. The CB900 discs and calipers simply bolt on in place of the CX stuff. With one exception, later CB900's had anti dive built into the front suspension and was activated by the calipers so the mountings are different. Not sure what year anti dive was added.
In my case I have the discs from the frst version of the CB900 which only had single pot calipers but I have the twin pot calipers from a slightly later version. This means there is a band around the inner part of the disc which is not touched by the pads. No big deal. Sure it would look better with the later discs which have the slots in them.
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06-06-2009, 2:08 PM
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prairie
Joined on 05-25-2009
central Iowa
Posts 99
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Just went and measured my CX/GL500 single disc setups, both are 275mm diameter. Anybody know of a disc that will bolt onto a ComStar thats signifantly larger? Something around 300mm would be a real improvenent.
1973 CB350G
1978 CX500 Lumpy
1982 GL500 (just got it woo hoo!)
1989 NT650 or Hawk GT
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07-16-2009, 6:41 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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The post is a bit old - but I'm hoping the person is still out there...
I'm studying the swap - its great - and hoping I can get some insight into the brackets you used for the swap.
Using the bike bandit as a resouce guide, I cannot tell which brackets are the correct ones to use.
I believe I understand which rotors to use (I am looking for ones from a CB750F or CB900 model)
I believe you are indicating the twin pot calipers can be used - thats what I have on the 82 GLI.
I think if I get the rotors + brackets + ss brake lines, I can make this swap too. Can you help?
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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08-22-2009, 11:43 AM
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ScrapMetal
Joined on 07-18-2009
NY/CT
Posts 104
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Bump.
I'm doing a caliper switch now also.
1979 CX500C - blown engine
1980 CX500C - a work in progress
2003 Aprilia SL1000R "Falco"
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10-07-2009, 3:31 PM
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Thorivola
Joined on 10-07-2009
Madison/Milwaukee, WI
Posts 68
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I just bought a 1979 CX500D last night and have ordered a caliper and the bracket off e-bay for $33 shipped they claim is in working order with decent pads
Has anyone tried to do a full front-end swap with a CB900? As long as the fork diameter is the same and the lengths are within an inch or so I would imagine it would work. I have access to another comstar rim that I will be grabbing and potentially modding to get a better break system on this thing.
This winter I plan a complete cafe racer alteration, so maybe I'll have to get a full front end suspension and take the neck from a CB to weld on?
Thoughts please.
Current bikes:
2004 Buell XB12R Firebolt
1979 Honda CX500 Deluxe
Old bikes/previous rebuilds:
1987 CBR600F Hurricane
1982 CB650
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10-28-2009, 3:00 PM
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ScrapMetal
Joined on 07-18-2009
NY/CT
Posts 104
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Sooooo, I've just received my 1982 cb900 caliper to place onto my 1980 CX500C and I'm a bit puzzled. It appears as though the CB caliper bracket is WAY longer than the CX. ? ? ?
Any thoughts on this one?
1979 CX500C - blown engine
1980 CX500C - a work in progress
2003 Aprilia SL1000R "Falco"
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10-28-2009, 4:43 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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ScrapMetal,
You have an 80 CX custom, does it have a stock dual 30mm pot caliper or single 42mm pot caliper?
I belive the single brake disc on your 80 CX is 280mm.
It sounds like you are just trying to swap out the caliper from the single pot to a dual pot caliper. Is this right?
You are not going to dual disc brakes - is this correct?
If this is true, your lower fork caliper braket attachment points may be spaced for the single 42mm pot caliper. Since your single brake disc is the same 280mm as the CB900's, there is no adavantage to swaping single pot calipers. You want to swap to the dual pot calipers. This may require swapping forks or having custom mounting brackets to hold the dual pot caliper to your fork. I don't think you can mount an 83 CB900 caliper bracket to your current fork then add the dual pot caliper.
that said, you maybe able to add another disc to the front right and add another single pot caliper to that side (will have to source out the lower fork with the caliper attachment points). Then you would have dual 280mm disc brakes using the single 42mm pot calipers...
enough with the pots already...
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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10-28-2009, 5:48 PM
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ScrapMetal
Joined on 07-18-2009
NY/CT
Posts 104
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Jerry,
My bike came with a single pot, I'm assuming it is stock. Single sided. I'm trying to switch to a dual pot 82 cb900. It looks as though I'd need a custom fork mount. I was thinking I could just bolt and run as per the Blindstitch thread of all knowledge (general discussion first post)[Hey wait a minute, that IS this thread!]. The link never mentioned any fabrication of mounts.
You are correct in that I am not trying to switch to dual discs, although who knows what the future will hold!
1979 CX500C - blown engine
1980 CX500C - a work in progress
2003 Aprilia SL1000R "Falco"
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10-28-2009, 6:22 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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ScrapMetal,
Not to talk you out of a project, but I dodn't see much of an advantage to swaping to a dual pot caliper as the disc is still a single 280mm. At best, the only thing you are doing is increasing the surface area of the brake pad a bit + increasing the ratio of master cyclinder area to caliper piston area (about a 7% improvement; 1,414/154 vs. 1,321/154).
I think you will get more stopping power per dollar invested if you source out a dual 280mm disc setup with dual pot 30mm or 32mm calipers. If you commit this much effort and funding, spend a bit more and swap out the master cylinder to a 12.7mm diameter piston vs. 14mm stock.
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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10-29-2009, 3:14 PM
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ScrapMetal
Joined on 07-18-2009
NY/CT
Posts 104
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Jerry,
Not to worry about talking me out. I'm just getting into this stuff so all the suggestions are quite welcomed.
I've already purchased a new MC and SB Brake lines, so the only thing left to fiddle with was the caliper. My project has not been road tested yet so this is really the last piece to the puzzle before I give it a run up the road.
Looks like I'll just hook up the old caliper and see what happens and how it feels then reconsider.
Thanks!
1979 CX500C - blown engine
1980 CX500C - a work in progress
2003 Aprilia SL1000R "Falco"
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10-29-2009, 6:11 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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good luck - don't forget to post pics!
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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10-31-2009, 10:49 AM
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ScrapMetal
Joined on 07-18-2009
NY/CT
Posts 104
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Well, looks like the culprit is the brackets. I'm measuring 4 inches bolt to bolt on the CB and only about 2 3/4 on the CX.
Either I've got the wrong CB bracket or the wrong CX forks.
Looks like I'm sticking with the "original" single pot for a while.
1979 CX500C - blown engine
1980 CX500C - a work in progress
2003 Aprilia SL1000R "Falco"
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01-13-2010, 8:50 AM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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I'm thinking of upgrading my braking by adding a right caliper to the cx500 fork leg and I was wondering if the single piston caliper and bracket will work so I don't have mismatched calipers on each side?
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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01-13-2010, 5:58 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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Blindstich,
Sounds like you will have 4 things you will need to put on the bike.
1. Rt disc
2. Bracket to attach to lower fork
3. Bracket to interface to new lower fork bracket and brake caliper.
4. Caliper
#1 is easy.
#4 drives #2 and #3.
It is possible that #2 and #3 can be combined as a single item that attaches to the fork. THis might be a problem if you want to use a factory single piston caliper. My guess is that the fabricator will want to go with dual pot calipers. If the fabricator goes with a single piece design, then you will need to upgrade the left side to match brake calipers.
So, if you can talk the fabricator to make a fork attachment design only, do so. Tell him you'll pay the delta to make the interface bracket (#3).
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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01-13-2010, 6:15 PM
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WisconsinCX
Joined on 07-07-2008
Germantown, WI
Posts 772
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Don,
Why don't you just buy the front end off a dual disc 750, 900.....
Then have your triple clamps milled out to fit the new forks if needed...a 1979 750 forks may be the same diameter....
I have a complete front end off that 1100F beater with the big brakes, cast wheel, TRAC forks, triple clamps...I'm sure with that set up you could sure haul a CX to a stop pretty good! A bit of an overkill tho! Oh, wait...I don't want to sell it....dang.
BH
83 CB1100F Super Sport
No Twins at this time. :( Went through about 12 of them tho!
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01-13-2010, 8:01 PM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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Well what's up is one of the guys on here is making a prototype of a right fork attachment for a caliper and if that works I'm going to demo it. I would do the whole front end again if I had one on the cheap.
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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01-14-2010, 5:30 PM
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Mell00
Joined on 12-05-2009
Sherrills Ford North Carolina
Posts 58
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Speaking of that....Just put the assembled wheel, forks and stock brackets up on the ferrel arm to be digitized. I will get exact dimensions in 3-D to assist in creating the new right side bracket.
I don't do the measusring on that piece of equipmet so I have to wait until my collegue can do it.
Current stable: 79' CX500C, 86' FZX700 (resto projuect), 04' KTM 125SX, 96' KTM 360EXC, 99' KTM300MXC (resto project), 04' CRF70, 99' PW50, 91'LT250R (resto project)
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01-14-2010, 5:40 PM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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Sounds interesting.
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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01-14-2010, 5:59 PM
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WisconsinCX
Joined on 07-07-2008
Germantown, WI
Posts 772
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I still have that dual disc front wheel if you need it. Just the wheel...no discs or tires.
83 CB1100F Super Sport
No Twins at this time. :( Went through about 12 of them tho!
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01-14-2010, 6:06 PM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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Thanks Barry.
I'm going to see what Mel comes up with for this prototype right fork adapter. Who knows it could be a really simple upgrade solution.
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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Honda CX500 & G... » CX500 GL500 Tra... » CX Customizatio... » CB900 Brake Swap
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