gsx1100 period 5 build

[mozza]

Hey guys, as some of you would be aware I have a GSX1100 1982 that I want to use to build a period 5 racer, my question :

Does anyone know of a good combo of wheels and front forks that are considered an aesy fit and can be used in this class ?

I'll be using the standars rear swinger but getting it braced along with bracing the frame, I'll also get some good triples made for the front end to tighten this up a bit.

It's along term build that I want to do as show quality but need to start getting bits together.

Thanks in advance for the help

[Tony Nitrous]

What do the rules allow ?

My 1100ET has relaced wire's with 18" rim's
using early GSXR size tyres, 160 rear I think ?

Works OK.

EDIT: Just had a look,
110/80/18 front,
160/60/18 rear.
GSXR1100J size's I think ?
Stock fork's, Stock swingarm arm.
(although chains close to the tyre and should be spaced out a little)

[RUSS M8]

Rules are 3.4 inch front and 4.5 inch rear wheels. Have to kinda look something like period, and everyone has decided 3 spoke is OK.
So, early GSXR ones are common, although the later SV650 ones look very similar and are slightly lighter. You can also use Kwakka rims, ZZR600 I think are right sizes. And Ducati, Monster/SS 600 use a 4 1/2.
Forks are max 41mm I think, or 42? And, obviously, must be conventional. So, really, there are a thousand bikes to choose from with 39/40/41mm forks. I think Robbie Phillis is still using GSX items...? The Honda boys often use really old Goldwing forks, slightly beefier :) But, there are a heap of late 80's early 90's Jap sports bikes the right size I think.

Other thing to think long and hard about is front discs. Rules are fairly specific on rotors, so you can't just bolt on whatever comes with your new wheelset... If you don't wanna make up custom rotor centers check discs out before you buy the wheels!

Here are 88 GSXR750 rims on a CB1100R :)

http://www.asfphotos.com/upload/1286011109.jpg

[devo]

What Russ said....... Zed14 or Chris41 would be ideal to answer this.
Tony the GSX11 has a 140 or 150 from memory.

[Tony Nitrous]

quote:Originally posted by devo


Tony the GSX11 has a 140 or 150 from memory.


Mine's still wearing the same 160/60 it arrived with.
I just went out to have a look....;)

[RevHead]

i gotta a 1200 bandit front end if you need 1,cheap

[devo]

quote:
Mine's still wearing the same 160/60 it arrived with.
I just went out to have a look....
I blame getting old for that :D:D:D
So how is the Ol Girl goin you still treat'n her good I hope ?[:p]

[Tony Nitrous]

Not done any long run's on it, but get regular blast's around
bayside and run's to the pub / cafe / bikeshops etc.

Out playing recently with a few mates on newish Ducati's, a ZX9R, Bandit.
Tight local country roads. Straights were OK but I was f*cked though the twistys!
Need to remember its got 30 years old brakes/forks/etc.... :D

[8D]
http://img268.imageshack.us/img268/8955/oldold.png

[probike]

http://www.asfphotos.com/upload/1286020387.jpg

this is the bike Trevor Birrel and myself built It uses 41 mm honda 600 forks gsxr1000 front and rgv rear wheels we had to change the front rotors braced swing arm braced frame

[DiscoDan]

quote:Originally posted by revheadpete

i gotta a 1200 bandit front end if you need 1,cheap

They're 43mm unfortunately as they can handle very nicely with a cartridge kit

[mozza]

Thanks boy's, Hey Dale I love that GSX that Steve Martin has been riding. Any detailed info regading the build that you can help with would be greatly appreciated.

I intend to use the bike for a track day blast but want to build to a spec that could be used in the future if I ever wanted to go racing or a class got started down here in Tas. It's the building process that I get more fun out of, plus I've always wanted to do a really high end build and touch up some later model bikes on an older machine

[Zed14]

gsxr750 or 1100 front will go in relatively easily. rgv and 250 bandit you have to change the bearings. 250 bandit only has one disc but the other side is pre drilled just covered you just have to thread. chris41 uses xs1100 discs and redrilled the mounting holes to suit. i used gt750 suzuki front discs got them machined for lightness and made my own billet centres to mount them. forks can only have preload no compression or rebound damping. however if you use cbr600 f4i they are 41 and long enough and thats the hard thing to find. and have no rebound damping but they do have compression damping but you can modify the adjusting screw to sit lower in the top of the forks and put an air fitting in there. this is cheating but a few people are getting away with it. gsx750f forks 92 on models are 41mm are long enough and work ok with new springs to suit and get some slabby preload adjusters and they screw in no prob giving you minor adjustment and legal. slabby triples are 41 and will mount straight into your gsx so no prob.you should be able to mount the rear wheel into your standard swingarm no problem or you could use a gsxr750 88 swingarm and put shock mounts on it then cut off the monoshock mounts then box in the front and call it homemade.:) hope some of this helps. front calipers we used early brembos off a bmw they are light and just get some good pads. make up some adapters to mount them. i used the front section of the gsxr swingarm for my over flow tank. most people with gsx use the cb1100r tailpiece you can get one from bob at homebush fibreglass.http://www.asfphotos.com/upload/1286024895.jpg


http://www.asfphotos.com/upload/1286058512.jpg


http://www.asfphotos.com/upload/1285982099.jpg


http://www.asfphotos.com/upload/1286014658.jpg


http://www.asfphotos.com/upload/1286058954.jpg

[80s freak]

I have a complete RF600 front end in mine even the stem fits unmodified. 41mm dia. might struggle to find one tho. I do still have my original complete front end '81 model no anti dive if you need any bits. Arse end is '88 gsxr750 complete wheel disc and carrier running 3/8 off set front sprocket brake torque arm mounts to original centre stand mount.
http://www.asfphotos.com/upload/1286003071.jpg

[mozza]

what do you guys think about using a cbr600 F2 front forks and the 88GSXR750 front wheel ??

[mozza]

cant believe it, just checked the 4 sale section and someone has a set of 88GSXR front forks and wheel, just missed out by the looks of it. Damn !!!!!

[probike]

here are some pics of the bike just as a roller I got 2 sets of forks from the usa cbr600 f2 Ihave the mould for the seat section if you need one I,m currently working on a new bike which will be a kat body work is already made one piece seat unit one piece fairing with head light blanked off and making my own frame will put up some pics of it further down the track if you need any more info just let me know Dale
http://www.asfphotos.com/upload/1286055901.jpg


http://www.asfphotos.com/upload/1286034545.jpg


http://www.asfphotos.com/upload/1286033822.jpg


http://www.asfphotos.com/upload/1286028827.jpg

[mozza]

mate the mould would be awesome, any chance you could send me some decent resolution pics and a basic spec sheet to smorrisby@das.com.au

It's pretty hard to find info on what mods people have done out there. Doubt I'll ever race but love the look of these and Kats and would just love to have a trick custom built bike in the shed, plus its something different to have out on the track compared to everyone on late model stuff.

Anything that you are willing to assist with would be greatly appreciated.

Love that bike you have built, why the change ?

[mozza]

what are those front disc's that you run ? They dont look familiar. Also what model GSXR1000 has a 3.5" front wheel ?

[RUSS M8]

Most Gixxer thousands have a 3.5 inch front, that's the standard rim to run a 120 section front tyre.

[probike]

they knocked back those discs we had to run these
http://www.asfphotos.com/upload/1286051658.jpg

[mozza]

anyone know the width of an early 1200 Bandit front wheel ? I think they are wider than 3.5"

[probike]

I dont think they would be wider

[Tony Nitrous]

quote:Originally posted by mozza

anyone know the width of an early 1200 Bandit front wheel ? I think they are wider than 3.5"


I think ALL 1200 Bandits,
Both the Oil-Boilers shapes, and the Water-cooled had 3.5's ?

http://www.banditalley.net/wiki/doku.php?id=bandit_alley_wiki#st_generation_1200_1 995-2000

[RUSS M8]

Bandit is 3.5

Rims aren't especially light, and generally not the greatest balanced wheels either (they can take 60+ grams to balance)

[TurboKat]

According to the PCRA rules, forks must be 41mm max dia, non cartridge, vertical or single horizontal pinch bolts (I've seen blokes using ZX6 cartridge forks with one of the pinch bolt holes welded up) no external adjustability (maybe preload is OK now that the cutoff is 1982) All antidive equipment including castings therefore must be removed (that means if you'd have bought those GSXR forks, you'd have had to machine the antidive mountings off the sliders - pain in the bum)
Discs must be non floating except for RG 500 MK1V or replicas thereof (this rule might be different now with the later cutoff) 300mm max dia.
As Russ said, most use the swept spoke Gixer 750 J/K wheels, there are a couple of sets of ZZR 600 jobs floating around & a couple of Ducati 600 Monster ones. I didn't think the RGV wheel would be able to handle the grunt of a hot 1100 because of the small cush hub area - I tore the fingers off one on my 'Motard - but Dale's No 99 bike has the most power in the whole field & they're using RGV units so they must be OK. I've got SV 650 rears because they're lighter than the Slingies with the same cush area, plus they're straight spoke so they match the bandit front wheels.
A hot tip is to use a Blandit front wheel (smaller disc mounting PCD than the Gix ones) & early Slabby 750 discs, both are readily available & reasonably priced, you hafta elongate the mounting holes in the discs a tad but it's piss easy.
Rexie is spot on with the forks, I'm using the GSX1100F jobs, 41mm, no antidive, no adjustability (I hadn't thought of the Slabby preload cap idea, that's gold - thanx mate.)
Mick Hone told me ages ago that the GS/GSX frames don't need bracing but the swingarms definately do, I've put some bracing in anyway as most do, if you're on a budget, Mick also said that the GS steel swingers are a lot stiffer than the GSX ally ones.
Hope this helps.

[mozza]

thanks mate, the more info the better. I like the idea of Kat bodywork, I'd only need to source a tank and hopefully Dale can assist on bodywork details.

[probike]

Here are the pics of the katana tail section I have made the grey one is the plug white are just out of the mould
http://www.asfphotos.com/upload/1286286926.jpg


http://www.asfphotos.com/upload/1286322473.jpg


http://www.asfphotos.com/upload/1286357316.jpg

[probike]

quote:Originally posted by TurboKat

According to the PCRA rules, forks must be 41mm max dia, non cartridge, vertical or single horizontal pinch bolts (I've seen blokes using ZX6 cartridge forks with one of the pinch bolt holes welded up) no external adjustability (maybe preload is OK now that the cutoff is 1982) All antidive equipment including castings therefore must be removed (that means if you'd have bought those GSXR forks, you'd have had to machine the antidive mountings off the sliders - pain in the bum)
Discs must be non floating except for RG 500 MK1V or replicas thereof (this rule might be different now with the later cutoff) 300mm max dia.
As Russ said, most use the swept spoke Gixer 750 J/K wheels, there are a couple of sets of ZZR 600 jobs floating around & a couple of Ducati 600 Monster ones. I didn't think the RGV wheel would be able to handle the grunt of a hot 1100 because of the small cush hub area - I tore the fingers off one on my 'Motard - but Dale's No 99 bike has the most power in the whole field & they're using RGV units so they must be OK. I've got SV 650 rears because they're lighter than the Slingies with the same cush area, plus they're straight spoke so they match the bandit front wheels.
A hot tip is to use a Blandit front wheel (smaller disc mounting PCD than the Gix ones) & early Slabby 750 discs, both are readily available & reasonably priced, you hafta elongate the mounting holes in the discs a tad but it's piss easy.
Rexie is spot on with the forks, I'm using the GSX1100F jobs, 41mm, no antidive, no adjustability (I hadn't thought of the Slabby preload cap idea, that's gold - thanx mate.)
Mick Hone told me ages ago that the GS/GSX frames don't need bracing but the swingarms definately do, I've put some bracing in anyway as most do, if you're on a budget, Mick also said that the GS steel swingers are a lot stiffer than the GSX ally ones.
Hope this helps.
the reason you may have broken the fingers of your rgv sprocket drive could have been sloppy drive rubbers we keep on top of them

[mozza]

the glass looks good Dale, are you interested in selling a complete set once your own is sorted ? and if so do you have any idea on what a set would cost ? or would you be interested in selling a copy of your existing rear cover on the bike that Steve rides ?

I understand if your not keen but just thought I'd put it out there.

[mozza]

after looking again I really do like the look of your first build Dale. Let me know if we can do something regarding the fiberglass rear.

[fast2v]

Dale, I would be interested in the glass rear end, thought of a price? hope to debut my Kat at the Motogp!

[probike]

quote:Originally posted by fast2v

Dale, I would be interested in the glass rear end, thought of a price? hope to debut my Kat at the Motogp!

I don,t think I could do one in time

[pucks711]

gday are you making these tails for the katana i would be interested in one for sure .
let me know thanks

[mozza]

1484bit of an update, she's heading off to Manta Enterprises next week for a bit of work !!!!!

[80s freak]

Looking the goods, In good hands at Manta, saw Stiff Simons frame the other week, looks great.

[BANDITROD]

looking good mozza

[stiffsimon]

Peter will see you right Mozza. He's a good bloke and knows his stuff. I'm very happy with the work he's carried out on my bike. I'm sure you won't be disappointed.Would like to hear your update when he's finished with it. Looking good by the way.