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Author Topic: 1981 GS750E (GSX750E) Rat Cafe Racer  (Read 1195 times)

Offline LKS

  • Posts: 17
1981 GS750E (GSX750E) Rat Cafe Racer
« on: Feb 05, 2018, 14:01:31 »
Hi everyone! I've been working on a bike for a while and decided  I'd start a thread to get feedback and to get help when I get stuck.

Here's a picture of the bike when I bought it. The engine ran OK, but the bike was misssing som parts like som bolts, and one of the engine mounts. I descided to take it apart and make sure everything was in order.

gsx by Lars Krogh-Stea, on Flickr

All the small parts removed:

20151203_212014_zpsze8gyesy by Lars Krogh-Stea, on Flickr

This is how the bike looks now:

IMG_20170708_231958_149 by Lars Krogh-Stea, on Flickr

I'll explain some of the work and choices I've made in the following posts

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #1 on: Feb 05, 2018, 15:48:13 »
I have no previous experience with metalwork, so behind every part is a lot of Googling and hours of Youtubewatching.
In the next picture I've made some kind of buck to bend the rear seat around:
20160529_194812_zpsc9rkobar by Lars Krogh-Stea, on Flickr

Here I've been trying some TIG welding. extremely easy to burn a hole in the thin plates:

IMG_20170408_221434_282_zpsxqqxjpj2 by Lars Krogh-Stea, on Flickr

Here the seat and tank is painted, rat-style. The tank is a cheap, dented one from a Honda CX500. I also found a how to make a seat on Youtube, so I borrowed my wifes sewing machine and followed it as close as possible:

IMG_20170630_144244 by Lars Krogh-Stea, on Flickr

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #2 on: Feb 05, 2018, 15:56:36 »
Wanted wider rear wheels and also wanted to get rid of the cast wheels. So I got hold of a 1977-9 gs750 hub. This hub is for both disc brakes and spokes. Ordered a 4.25x18 aluminum rim for it and powdercoated spokes and hub. The rim was powdercoated by the supplier.

20160707_133821_zpsx0ns4jgx by Lars Krogh-Stea, on Flickr

Snapchat-3550012378084688016_zpshtswbcoz by Lars Krogh-Stea, on Flickr

20160707_212122_zpsp8rix6ty by Lars Krogh-Stea, on Flickr

20170112_101044_zps2gerfrjv by Lars Krogh-Stea, on Flickr


Fitted it with Pirelli Night Demon 150/70-18:

IMG_20170208_083312_zpsnwkvjqnk by Lars Krogh-Stea, on Flickr

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #3 on: Feb 05, 2018, 15:59:01 »
I have a friend with a cnc-router, so I decided to make my own rear sets. Excited to see how that goes:

IMG_20170402_181501_502_zpsbsmnmawy by Lars Krogh-Stea, on Flickr

Offline The Limey

  • Posts: 378
  • Evil English Villain
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #4 on: Feb 05, 2018, 18:04:12 »
Intriguing.  I'm in.
I was born a rocker.  I'll die a rocker.  And I'm proud of it.

Offline canyoncarver

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #5 on: Feb 05, 2018, 18:40:48 »
Cool!
--
KZ400 The Rabbit
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
65 Norton, My damn Shovelhead chop
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
--

Offline spotty

  • Posts: 931
  • Vmax...why,yes i think i will
    • spottys world of vmax (and great danes)
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #6 on: Feb 05, 2018, 18:49:50 »
nice, i had the 1100 version a long time ago, it got a 70 endurance racer fairing and a genuine CB1100R kevlar seat, hideously uncomfortable but looked great and went like stink (topped 250kmh out on the highway)

i was amused to see the pic with "small parts removed" with the headlight taken off, not what i'd ever have described as a small part.....

keep up the good work
short fast loud, three things punk rock and vmaxs have in common

south of the border, down melbourne way

Online Hurco550

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #7 on: Feb 05, 2018, 18:50:55 »
I like it! Nice work so far

Sent from my SM-G920V using Tapatalk

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj

2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennett

Offline The Jimbonaut

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #8 on: Feb 05, 2018, 19:16:18 »
Wait, what?!?  First time making all this stuff and it looks that good?  Kudos my man, looking great!  (And I hear you on the Youtube thing - I'd be sunk without it!)
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline hooligan998

  • Posts: 210
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #9 on: Feb 06, 2018, 01:19:40 »
In.  Inspiring work.

Offline CrabsAndCylinders

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #10 on: Feb 06, 2018, 01:46:50 »
Looks great!
Lighter, Quicker, Faster.
ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #11 on: Feb 07, 2018, 11:42:17 »
Thanks for all the friendly replies! I will keep you updated :)

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #12 on: Feb 18, 2018, 18:06:21 »
Got som time with the bike today. Did a test of the rearsets on the brake side. When i have the final measurements for both sides I will make some more parts on my friends cnc-router.
The arms that hold the linkage will be about an inch shorter and much slimmer in the final version.

Pictures:
27971797_10155989847505915_6775108173156400425_n by Lars Krogh-Stea, on Flickr

28055771_10155989847360915_8431573641075982601_n by Lars Krogh-Stea, on Flickr




Video:


Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #13 on: Mar 29, 2018, 04:34:09 »
Had a full days work on the bike today :) Tedious work, and I'll need another full day to finish these. Hope I'll get the time to take another full day off soon.

IMG_20180328_203355 by Lars Krogh-Stea, on Flickr

IMG_20180328_123910 by Lars Krogh-Stea, on Flickr

Offline JustinLonghorn

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #14 on: Mar 29, 2018, 07:12:34 »
keep it up, man. Nice work so far.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #15 on: Apr 06, 2018, 10:42:44 »
Today I got to finish one of the parts that I've really been looking forward to see finished. The Motogadget MIni embedded in the headlight. The result is not perfectly symmetrical, but close enaugh :)

Motogadget embedded in headlight by Lars Krogh-Stea, on Flickr

Motogadget embedded in headlight by Lars Krogh-Stea, on Flickr

Motogadget embedded in headlight by Lars Krogh-Stea, on Flickr

Offline canyoncarver

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Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #16 on: Apr 06, 2018, 13:22:06 »
Very cool.  Nice work.   
--
KZ400 The Rabbit
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
65 Norton, My damn Shovelhead chop
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
--

Offline LKS

  • Posts: 17
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #17 on: May 22, 2018, 18:32:17 »
Rearsets testing. Needs better finish and some adjustments

2018-05-22 23.09.51 by Lars Krogh-Stea, on Flickr