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Updated front end for GS750

  • Thread starter Thread starter RocketReady
  • Start date Start date
R

RocketReady

Guest
I hope this makes sense.
My bike currently has stock forks, spoked rims, and single disk brake.
I like the spoked rims. I am going to install clip-on bars and hate the half bar-clamp that is still on the top tripple clamp. I would prefer a twin disk brake setup. I also have the choke knob/cable running through the middle of the top tripple clamp(stock).
Is there a setup I can rob, beg, or steal that will allow me to retain my current spoked rim, add twin disks, and get a nice clean looking top tripple clamp, and retain the current choke position?
I have not re-built the forks yet and have not purchased the clip-ons yet because I am not sure what fork diameter I am going to end up with.
 
GS%20side.JPG

I have done a similar change but mine is not really an update since I still use old style forks. Mine has GS1000 forks, they are 37mm tubes rather than the 35mm that the bike came with. But the rest sounds similar to what you are looking for.
Which model 750 do you have since the 750E came with dual disc?
And are you looking for new style forks or want to keep the style you have?
Sorry about the work in progress shots.
GS%20Triple.JPG
GS%20brakeF.JPG
 
I like what you are doing with that bike! That is what I want but would like to retain my spoked rims, is that possible? Are those GS1000 tripple clamps, brakes, and disks also? Where did you mount your choke actuator pull knob to?
 
No problem, you can retain your spoked front wheel. The other side of your spoked wheel is already drilled and tapped to receive a disc on the right hand side under the existing black cover. You will need the forks off a dual disc model to mount the caliper on the other side.

Search under Ninja Brake Mod for description on how to fit twin piston Kawasaki calipers to both sides and upgrade to dual discs.
 
My goodness what increase have you made in fuel capacity?

that tank is ungodly huge.
 
Thank you,
This bike is a 79 GS550E, the little cousin to your bike so there are a few differences.
Yes you can retain your spoked wheels. The bolt pattern for the discs are the same.
The 550 had the choke down on the carbs so I never had the cable and this bike as a set of smoothbore pumpers on it. So i do not have any starting circuit in the carbs, I just prime the engine with the accelerator pump and she fires up.
My triples are a mix of 550 and 750 parts, best I can tell there is no difference. This set of clamps were bored out to accept the larger tubes of the GS1000 forks. I chose to do it this way since the GS1000 spaces the tubes further apart.
You could get by with a set of 750E forks that have the caliper mount on both sides.
The calipers are from a Bandit, they were available on some Kawasakis also. I do not know the model but someone may chime in with that info.
My calipers needed welding to add one mount to them but bolt on adapters are available on this site.
The discs are early Honda CBR 900. Might be the same as some Honda 750s also. The discs need the mounting holes drilled out to 8mm but otherwise bolt right up.
 
Hi Calvin,
Yup that tank is coming out pretty large, The original tank I built for the bike way back when I raced it was a 5 1/4 gallon. It was great for endurance racing since we could run a full two hours each fill. Made for quicker stops when we only changed riders.
This is the original tank and the 750 one before chopping it up.
GS%20Tanks.JPG
 
What year 900 RR do those Rotors come from?? I want em. Bad. I need to find some. Basicly the Kaw mod on the forum here would work with those discs??
 
The first year, I actually do not know when that was. I did just take a look on ebay and there are a few sets listed. These happen to be 295mm dia. I think later ones are a bit larger. I did this brake swap 6 years ago so it is not fresh in my mind.
To my eye this brake setup is just right for these bikes.
 
TheCafeKid said:
What year 900 RR do those Rotors come from?? I want em. Bad. I need to find some. Basicly the Kaw mod on the forum here would work with those discs??
Click to expand...

Dan (Salty Monk) and I have figured out that F3 rotors (and the same sized 900RR rotors) will work for his Kawasaki brake mod. They are 295mm OD. Most of the RR rotors are 310mm and will not work with Dan's brackets. Dan has a set of the F3 rotors and is waiting on a 2mm (I think it was) spacer to center the rotor in the ZX-6 calipers. When he gets them in, I am sure he will post his results. The bolt pattern is not the correct diameter on the Honda rotors and requires redrilling the carrier to fit the GS wheel.

The Honda rotors should be several pounds lighter (each!:eek:) than the GS 295mm rotors that he originally used for his conversion, resulting in better handling and suspension action along with better braking. If Dan doesn't post his results, I will when I get the spacers and calipers installed on my 1100E.

Mark
 
Mark M said:
Dan (Salty Monk) and I have figured out that F3 rotors (and the same sized 900RR rotors) will work for his Kawasaki brake mod. They are 295mm OD. Most of the RR rotors are 310mm and will not work with Dan's brackets. Dan has a set of the F3 rotors and is waiting on a 2mm (I think it was) spacer to center the rotor in the ZX-6 calipers. When he gets them in, I am sure he will post his results. The bolt pattern is not the correct diameter on the Honda rotors and requires redrilling the carrier to fit the GS wheel.

The Honda rotors should be several pounds lighter (each!:eek:) than the GS 295mm rotors that he originally used for his conversion, resulting in better handling and suspension action along with better braking. If Dan doesn't post his results, I will when I get the spacers and calipers installed on my 1100E.

Mark
Click to expand...
PLEASE DO! I can see this being an instant mod on my soon to be mine 1100ES :)
 
Are you guys spacing the caliper in or the rotor out?
With the narrower fork spacing of the 550 and 750 I did not need spacers.
 
Old Colt said:
Are you guys spacing the caliper in or the rotor out?
With the narrower fork spacing of the 550 and 750 I did not need spacers.
Click to expand...

Dan measured it up on his 1000, I believe. I have not tried my 1100E yet. The rotor is being spaced out, it is an easy piece to make, just a 2mm shim with a pilot to center it on the wheel and the rotor and the GS bolt pattern drilled in it.

Mark
 
I have responded to a few "parts for sale" posts tonight and hopefully will obtain a set of gs1000 forks. I also checked out the Kaw Ninja brake mod/adapter plates available through Salty Monk. Thats looks to be very well suited to what I am trying to create.
Regarding tripple clamps: Should I bore out my existing 750 clamps or go to the 1000 clamps. I don't know what is the worse evil, dealing with the forks spaced apart further or weakening the tripple clamps by boring.
Any input greatly appreciated.
 
I imagine that the reason he doesn't need a hub spacer for the brake disks on that bike is 100% to do with the fact that he used the original triple trees & thus his fork legs are closer together. He could also have a slightly different offset on that caliper too.
The PCD is 74mm not 78mm so you can enlarge the original holes to 8mm but you have to do it off centre... not easy, I decided it would be better to drill new holes in between the existing. The spacer also acts as a template for that.

The spacer's I got are 3mm. Unfortunately I tried to be too clever & get a collar built in to take up the little bit of slack in the Honda centre hole, I couldn't get that done (for a reasonable sum - a lot more machining) so we deleted that part but long story short someone got confused & deleted the whole centre hole!!

Without this set back I'd be using the Honda rotors already, I've mocked it up & I'm very confident that it will work (enough that I already have two sets of rotors on the shelf)

More news asap, just waiting for new spacers now.

Dan :)
 
Hi Salty,
I do not recall the BC being different, but it was 6 years ago and being that I run a machine shop I may have offset drilled the hole when I opened them up. I thought mine were the same BC.
What are your thoughts to spacing your calipers in and making your adapters be the spacers?
OT - And any chance you run a bike engine in that Westy/ Caterham?

Rocket.
I have a spare modified upper tree that does not have bar mounts. I have been considering using it on my old T20 Hustler but that bike will be getting some Cerianis and I may not go to clipons on it.
It is not visually perfect but they do clean up the bike when running clipons.

There are no issues with boring the triples, plenty of material there.
If you can not get it done locally I can bore them for you.
 
I got a 79 gs 1000 with a Katana front end. do you know if the stock mags or spoke wheel will fit?
 
It would need some custom spacers made for the axle and caliper mounting.
 
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