gsxr conversion parts and upgrade answers

[pan]

Are you going to cut a slot in the lower bushings so they can compress enough to clamp the fork leg properly? Cool looking project, I like it when people try different combinations of parts/bikes rather than just following tried & tested mods.

Keep up the good work!

Mark...

 

[spdjunkie]

Hi Mark, yes, it's essential that slots are cut in those lower bushings, although the'yre machined to within .001-.0015 of the fork tube. They're actually difficult to get to slide between the forks & lower when I put everything together. It seems like there's enough pinch to hold them, but that's not something you want to mess with when hitting a highway bump doing triple digits. If I line up the slots to the rear you won't be able to see them anyway. I had a guy here on GSR interested in them, and he measured his stock forks against what I got from these (both unsprung during measurement), and he said it's within a half inch. I don't have a stock front end anymore, so I guess I have to believe him. At any rate, the measurement from the top of the "clampable" portion of the fork to the axle centerline is very close to 28.5".

 

[namikuz]

bump

bump

Bumpity bump!!!

 

[tone]

I'm glad this thread has been bumped to the top again i'd forgotton about it

Question for spdjunkie ........ with those bushings in the lower yoke whats to stop them sliding out in use ? i dont see any sort of fixing & doubt the clamping effect will be enough under hard use.... i may be wrong but its something worth thinking about

 

[Guest]

I used a set of 2001 GSXR750 forks, wheel & calipers with a 92 GSXR1100 lower triple & stem, and a CBR954RR upper for the extra drop. This will not work with clip ons as the clearance wouldn't be sufficient. I'm using the 954 upper with conventional bar risers added. These are a mod that I think were developed for stunters. The GSXR1100 lower was too wide an I.D. for the '01 750 forks, and the top end of the steering stem was too narrow just above the top steering bearing. For these 2 issues, I had a friend machine 3 bushings, 2 aluminum for the forks, and one steel for the steering stem, and they worked perfectly. I can get the dimensions again, and post them another time. My mods aren't bolt-on, by any means, and I want to point that out. Additionally, I had the 1100 lower & 954 upper precision measured by laser where I work. The offset was so minimal as to be practially non-exsistant.

As a disclaaimer, I've not had an engine in with a header yet, so clearance is still up in the air (no pun intended). I looks like it should work once there's a tire on the rim, though.

My couple of cents...

Why not use the 954 lower? it is the correct size for the forks and the spindle is correct for the top triple. Also, the 1100 stem offset is not correct for the 954 top triple.
As far as the bushings go, there should be a lip on the bottom edge to keep them from migrating up but that being said, the offset is wrong. I know you can make them fit with lose bolts but if you tighten the lower pinch bolts first you will see the stem is mis-aligned.

 

[kichigai]

USD GSXR Suspension Upgrade on a 83 GS1100ESD

USD GSXR Suspension Upgrade on a 83 GS1100ESD

For those looking at doing the early 90's USD GSXR front and rear upgrade on a 1983 GS1100ESD, Here are my parts list used for my conversion.

You can also find additional info on my conversion on the link below.
http://www.thegsresources.com/_forum/showthread.php?p=749432#post749432

Keiichi?s GS1100/ GSXR Conversion Project Cost

1993 Suzuki GSXR 750 forks front end $175.00
1993 Suzuki GSXR 750 rear wheel $157.50
1993 Suzuki GSXR 750 front wheel $155.25
1993 Suzuki GSXR 750 front brake rotors $109.01
1993 Suzuki GSXR 750 front brake calipers $28.00
1993 Suzuki GSXR 750 front axle $31.00
1999 Suzuki GSXR 750 SRAD front fender $64.00
2006 Suzuki SV650 bar risers $37.00
1995 Suzuki GSXR key ignition switch $25.90
2001 Bandit 1200 modified swing arm $335.00
2001 Bandit 1200 axle, adjusting blocks $30.00
2001 bandit 1200 rear brake arm and brake hanger bracket $50.00
Custom bushings for swing arm pivot $100.00
Dunlop's 208-ZR tires size 120/70/17 and 180/55/17 for $149.00
RACETECH FORK SPRINGS $109.99
530 (JTR816 series) 47T Rear Sprocket $31.84
530 Chain - RK 120 link 'X' Ring $96.84
530 Chain - RK split link 'X' Ring $4.05
AFAM 530 Multi Fit C/S ? 13M Offset Sprocket $64.16

 

[patrickmcp]

Quick question, I picked up a 1996 GSXR 1100 front end, which year wheels will work on the front end? 600, 750..??
Will the stops be the same as the preferred 1993 front end?
Concerns about SRAD?

Thanks in advance.

 

[Billy Ricks]

Quick question, I picked up a 1996 GSXR 1100 front end, which year wheels will work on the front end? 600, 750..??
Will the stops be the same as the preferred 1993 front end?
Concerns about SRAD?

Thanks in advance.

Pretty much whichever wheels you like the most. You'll need rotors and calipers from the same model. They can be pre SRAD, Srad, or later, but the rotors and calipers need to come from the same range of years.

 

[patrickmcp]

Thanks for the reply, aren't though more recent years changed to a larger axle size?

Are Busa wheels the exact same as GSXR's?

 

[Billy Ricks]

Thanks for the reply, aren't though more recent years changed to a larger axle size?

Are Busa wheels the exact same as GSXR's?

The Busa wheels should be the same. The axle sizes changed in '88, before taht they use the same size as the GS.

 

[tone]

The Busa wheels should be the same. The axle sizes changed in '88, before taht they use the same size as the GS.

hmmm not quite fella early water cooled bikes used the same dia wheel spindle as the oil cooled gsxr up to around 92 then they went to the larger spindle on busa's & TL1000 etc, ofsett from steering stem to fork centres & the distance between the fork centres themselves varies as does the disc ofsett

some parts can be mixed & matched but some cant so by far the easiest solution is to use the wheel discs & yokes from the same year as the forks

 

[Guest]

90-98 gsxr 1100, 90-95 gsxr 750's are 20mm axles front and back like gs.

busa and srad (96-99 gsxr 750) wheels will not fit with early 90s forks. The rear wheels will not fit either.

 

[Billy Ricks]

hmmm not quite fella early water cooled bikes used the same dia wheel spindle as the oil cooled gsxr up to around 92 then they went to the larger spindle on busa's & TL1000 etc, ofsett from steering stem to fork centres & the distance between the fork centres themselves varies as does the disc ofsett

some parts can be mixed & matched but some cant so by far the easiest solution is to use the wheel discs & yokes from the same year as the forks

My bad, I thought I had seen in the past where a few people had used late model wheels with earlier forks. Personally, I kept everything '95 or newer other than the 954 triple.

 

[long_av8r]

My bad, I thought I had seen in the past where a few people had used late model wheels with earlier forks. Personally, I kept everything '95 or newer other than the 954 triple.

It can be done and it is done on GSXR's, but you will need to change the bearings and pay close attention to what you use as far as rotor offset. You can mix and match quite a bit, but some combo's simply won't work, or require so much to make work that it no longer makes sense to do it. The other problem to get around is the speedo drive if you intend to use stock instruments. The SRAD's and up use electrical senders for the speedos, I'm sure you can work around it, but with other straight spoke wheel options, why bother?

Billy, you are absolutely right, 95 and newer below the trips is pretty much fool proof.

 

[ChrisW]

I'm glad this thread has been bumped to the top again

I know, no questions, but I would like to see any tips for:
* mounting stock headlights and gauge clusters to USD forks.
* how are you re-working the steering stops on the CBR954 triples?
* experience with rear-sets, and mounting plates?

Chris W
IBA #393

 

[FLHGSRay]

Maybe someone else can do the same with late 80's gixxer parts?, late 70's gs's and early 80's 1100E's?, and 1150's?

I'd love to see some stuff applicable to my '79 GS1000E. I'd like to go with a bolt-on aluminum swingarm, slotted rotors and matching calipers. Prefer bolt-ons.

 

[5t341th]

I'd like to bump this thread up because there is awesome info in here.
I also want to ask a few questions as well.

I see that most of these conversions are on bikes older than my year. I have a 85 GS700 and I'm not sure what bikes are equivalent to mine. It seems there are lots of pre-85 750s that are doing this swap and I'm curious if our frames are even similar.

I'm looking to do the more modern GSXR front end swap and also the rear wheel swap
Does the information for these other bikes apply to my bike? I know nothing as this is my first bike and I love the older bike style with modern parts

Also, the rear wheel swap, am I able to use my stock swingarm or do I have to upgrade to the newer swing arm. My rear tire is in need of replacement, so why not upgrade it in the process?

I appreciate any help and guidance. Thanks

 

[Guest]

This is my '83 750 as you probably know is the sister bike to the 700. Early gsxr wheel will fit in stock arm. Mine has 4.5 wheel with 160/60 -17 tire. Front fork is RF900 with (same style as rear wheel) gsxr wheel. Not bolt right up mods but, not major work either. Mine now has swingarm from a '94 1100 gsxr on it now, THAT was major work... If you do a search you'll find a lot of posts on this and other 700/750's modded like this.

 

[5t341th]

This is my '83 750 as you probably know is the sister bike to the 700. Early gsxr wheel will fit in stock arm. Mine has 4.5 wheel with 160/60 -17 tire. Front fork is RF900 with (same style as rear wheel) gsxr wheel. Not bolt right up mods but, not major work either. Mine now has swingarm from a '94 1100 gsxr on it now, THAT was major work... If you do a search you'll find a lot of posts on this and other 700/750's modded like this.

Thanks for the info. I'm looking to do the 93-98 gsxr front end because I really like the look of the inverted forks(it's called USD, right?)
What rear wheel from which gsxr fits the stock swing arm?

I've done searches but I mostly see older 750s with the dual rear shocks. Not the single shock like ours. I'm not sure if the part swap is the same between them

 

[jms]

I'm gonna give this thread a bump since I'm really interested in the info it contains. I've been looking into this swap for days and I finally came across some useful information!

*Advice for anyone looking for anything: there's at least one thread for you out there, you just have to be precise with your search words

My bike is a 1980 GS850G and after installing progressive springs and replacing fork seals (which started leaking right away) I'm really considering this upgrade.

It's my understanding that 90-93 GSXR 750 or 1100 forks bolt right on:

http://members.dslextreme.com/users/cbsaunders/gs/steering_bearings.html

But I have a couple of questions:

1. The 1980 stock wheel will NOT work on and a wheel corresponding to the year the forks belong to will need to be purchased, correct?
   
2. Does the rear suspension/wheel need to be changed at all? If so, why?
   
3. Will the frame suffer from this upgrade?
   
4. Is a steering damper needed?
   
5. Triple tress no longer include steering stops in the right place and these would have to be cut off and new ones welded into place? I recall seeing that some Honda triples solve this problem but I'd appreciate clarification.

I'm aware that the stock brakes won't work on these forks and that new calipers and rotors will have to be sourced too.

If anyone can answer any of these questions I'd be really grateful. I don't like making uninformed decisions and before pursuing this I'd like to know what I'd be getting myself into!