CB and the CG

[TUG]

quicky one for you all, could i swap the front end off a CB onto the CG both 125's obviously, better brakes on the CB. i'd swap just the wheel but i dont know if theres a clearance issue, can anyone comment?
thanks for the help!
____________________
Haz ER-5, innit!

[Kickstart]

Hi

Probably depends on which CB (there are loads of different models of CB125) and which CG. Fair chance the complete front end would swap across, but you might have issues getting the clocks to mount on the new front end.

And if the front end you source is one from an old CB with the cable operated front disk then don't bother. When perfectly set up they were just about OK, but most of the time they were useless.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[TUG]

hhmmm its a 88-89 cg from what i can make out of pics on bikepics, i've not looked at the bike propperly to determine year, but it looks in great condition and only £150. what cb front end would fit, not the super dream one, i'm after spoked wheels, i just want to fit up a front disc to have at least one good brake. with my 99 CG i found the brakes where no good and had to brake really soon. im also after swaping the clocks for 2 barrel type clocks.
____________________
Haz ER-5, innit!

[TUG]

is there any front ends with hydraulic disc brakes that would have the same spoked sized wheel i could get to fit a CG?
____________________
Haz ER-5, innit!

[virus]

doubt it, have a look for the cb125t comm stars if you like the look of them, not sure on back comm stars though.

you may have a size issue with comm stars though so id recomend getting another front brake set-up including brake plate and shoes, then getting another linkage set up and try to convert it over to twin leading shoe, would work fantastically but make sure you don't bodge it, if its not built solidly enough then your brake plate is likely to explode under heavy braking, not good.


Cheers
John
____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

[stinkwheel]

The CB and CG drum brakes are identical.

I'm pretty sure any CBs with wire wheels and a disc are cable operated discs which as G says, are a total abortion.

The CBs with cast wheels have hydraulic brakes but you would probably need the entire front end, I think the forks are wider.

Something I always considered is bastardising two CG brake drum callipers into a twin-leading setup (so steal the cam from one, knock the pin out of the other, bore the hole out and fit the cam in its place, join the two cams with a bit of threaded bar. The cam just runs in the alloy casting anyway.).

I have given it no more than thought at the moment. I'm pretty convinced the calliper could be modified without too much difficulty. Linking the two cams and having enough clearance for it to fit on the bike may be a different issue entirely.

If anyone fancies trying out my idea, please do and let me know how you got on.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TUG]

so could i go with the CB front and fine a differenet caliper to fit the mount and disc diameter? am not keen on drums as my 99 CG was really rubbish at brakeing.
____________________
Haz ER-5, innit!

[stinkwheel]

The CBs with the cable operated disc have a very weird calliper mount on the fork leg. I doubt you'd find a hydraulic one to fit, it kind of attaches at the leading side of the fork leg but loops round so the calliper itself is on the trailing side.

You would have to make a calliper mount entirely from scratch.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TUG]

dam, gunna be a difficult one this. but will find a way. any ideas? different set of forks?
____________________
Haz ER-5, innit!

[stinkwheel]

Whole front end off something else is probably your best option in this case.

The brakes aren't THAT bad, it's a light bike, I find the brake on my H100 (which has identical brakes to the CG125) perfectly sufficient.

Here's my suggestion. Get a modern, span adjustable clutch lever assembly off something like a GPZ500 (I say that because it's what I used when I did this). Fit it upside down in place of your standard CG brake lever. Now get a new bowden cable made up using REALLY thick cable like they use for car handbrakes with fittings to suit the clutch lever at one end and the CG drum at the other. Wire the front brakelight switch wiring into the clutch idiot switch.

You can pull this WAY harder than the standard levers. If you can pull it harder, you will brake harder.

I did this mod on my Jawa 350 and it made a massive difference to the brakes.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TUG]

thats a great idea, if i cant find a set of forks and hydraulic brake to suit then i'll use that idea. thanks for that stink mate! anyone got anymore suggestions, all are welcome.
____________________
Haz ER-5, innit!

[stinkwheel]

Here's my GPZ clutch Jawa brake lever.
https://www.bikechatforums.com/files/lever.jpg
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[hmmmnz]

the cb250g5 has hydrolic disc and spokes
although the stupid caliper is on the front of the forks
to be perfectly honest, the rear drum is more than suffecient on my cb,
i dont use the front brake as i get used to the proformance on the zxr and if i hop straight from that on to the cb, i find i nearly rear end people... and we all know, only a cunt hits the car in front,
so i just use the rear which i know is crap
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Paddy Blake]

No longer available

[virus]

i think a mtx 125 front end will do the job if you can find one, if not then running a twin leader on the front is the only real option, trust me a win leading shoe drum set up can make a cg stoppie, plenty powerful enough for the job
____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

[Pete.]

A big obstacle to converting a sigle-leader to twin-leader might be whether there's enough meat on the back-plate to support the spindle for the extra cam. The backplate will probably have a lump cast on it for the stock brake-cam.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[TUG]

great idea's guys keep em coming, the twin drum brake idea is cool, i could get someone to make me a better set of levers easy, but anymore ideas are welcome.
____________________
Haz ER-5, innit!

[Paddy Blake]

[TUG]

yes i have, and so far theres only one hydraulic option, you posted up a cb150 link and said a gs125? that confused me a bit. ok i wont go for the twin leadin shoes. anymore ideas? and the levers i would have made would be to take the bigger cable, and to match each other. why is that so wrong?
____________________
Haz ER-5, innit!

[Paddy Blake]

GS125.

[TUG]

right will have a look paddy thank you.
____________________
Haz ER-5, innit!

[Kickstart]

Hi

GS125 might fit, but I would be very surprised if Suzuki used a similar head stem to Honda. Basically you likely leave you trying to bodge the Honda stem onto the Suzuki yokes.

MTX125 would be way too long.

Your best bet would be the front end from a very late CG125.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[TUG]

[TUG]

is there a difference in tyre width? am guessing a whole front end jobby will have to do? is there a difference in stem diameter? dam i need to ask an old honda owner and a new one.
____________________
Haz ER-5, innit!

[ms51ves3]

A CB front end should fit. Isn't the front end in the picture a CB?