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Author Topic: 1981 GS750E (GSX750E) Rat Cafe Racer  (Read 4194 times)

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #40 on: Aug 21, 2018, 18:10:26 »
The complete fork. I'll remove some of the screws for sandblasting and powdercoating later..

Fork 2 by Lars Krogh-Stea, on Flickr

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #41 on: Sep 05, 2018, 17:54:48 »
Borrowed the cnc-router again. This time for the top triple. Did some prototyping in oak for speed.

L by Lars Krogh-Stea, on Flickr

L by Lars Krogh-Stea, on Flickr

Ordered gear indicator and warning lights from ebay. The gear indicator was awesome, but the warning lights was a big disapointment :D For some reason they were all blue. Waiting for another shipment with the usual blue, green, red and orange. I will alsp cut down to four lights and have one common light for the indicators. The reason for the hole next to the gear-indicator is that I forgot to alter the settings before testing on the oak. The aluminum I've bought is 8mm thicker and i trilled 6mm down into my friends router table :o

L by Lars Krogh-Stea, on Flickr

L by Lars Krogh-Stea, on Flickr

The reason for the uneven outer edges is that I went too fast and broke the end mill piece. Had to use a band saw to finish it off. It's only for testing so it doesn't really matter, and I have more end mills at home.

L by Lars Krogh-Stea, on Flickr

L by Lars Krogh-Stea, on Flickr


« Last Edit: Sep 08, 2018, 17:18:49 by LKS »

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #42 on: Sep 07, 2018, 14:15:16 »
After nearly a month of waiting... Tada..the m-unit blue 😊

Munit by Lars Krogh-Stea, on Flickr

« Last Edit: Sep 08, 2018, 17:22:27 by LKS »

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #43 on: Sep 07, 2018, 14:41:16 »
I was struggling to find a good placement for the speed sensor. I've seen some people mount them in the rear brake, or under the front fender, but I will try to modify the original speedo-gear unit. That way I won't have to machine a spacer to replace it. I will drill a hole inside the original hole to place the pickup perpendicular to the magnet. Then I'll grind off some off the original gear so the magnet will sit flush.

Sensor4 by Lars Krogh-Stea, on Flickr


Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #44 on: Sep 09, 2018, 04:42:59 »
I sodablasted the carburettors and dusted them of afterwards with compressed air. I thought I was careful not to get any soda inside them, but my father said I should open and clean them anyway.

2018-09-08_08-12-08 by Lars Krogh-Stea, on Flickr

Glad I did, because he was right. Also, although I've adjusted the needles in my zx7r and knew there were diafragms in there, I didn't know the big oval channel in the inlet was directly connected. I imagine if you blow hard enough directly in there, you might rupture the diafragms. Mine where fine, but I will clean my carburettors some other way the next time.

Soda by Lars Krogh-Stea, on Flickr

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #45 on: Sep 09, 2018, 19:22:56 »
Sometimes the build finds its own path and I have to tag along to see where the build goes. I've been good at spending time on planning to minimise the need for doovers. But when I thought I found a similar exhaust on the internet as I had stowed away 3 years ago, I was dead wrong. Measurements was wrong and after countless tries to make the new exhaust look good on the bike, I gave up. I then decided to make my own. The goal was to have the same amount of stainless perforated tube as in the Kercher.

Exh 5 by Lars Krogh-Stea, on Flickr

Lucky me had some stainless perforated tube laying around.

Exh 4 by Lars Krogh-Stea, on Flickr

Took some half inch aluminum to the lathe and made the end piece. It is stepped with the same thickness as in the perforated tubing. Did also put in some set screws to secure it.

Exh 1 by Lars Krogh-Stea, on Flickr

Packed it:

Exh 2 by Lars Krogh-Stea, on Flickr

And hammered it gently in. All that is missing is a screw on the backside to keep it from moving.

Exh 3 by Lars Krogh-Stea, on Flickr
« Last Edit: Sep 11, 2018, 02:53:43 by LKS »

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #46 on: Sep 10, 2018, 07:26:03 »

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #47 on: Sep 14, 2018, 16:22:42 »
New throttle control with teflon lining and adjustable sensitivity :)

Throttle by Lars Krogh-Stea, on Flickr


Offline hooligan998

  • Posts: 240
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #48 on: Sep 16, 2018, 01:30:53 »
Das beeyooteefull!

Offline LKS

  • Posts: 53
Re: 1981 GS750E (GSX750E) Rat Cafe Racer
« Reply #49 on: Sep 16, 2018, 10:17:30 »
Thanx :)

I've had a go at designing the wiring for the bike. I would be very grateful if someone would look it over and correct mistakes :) I'm not sure if I should connect the regulator to battery or switced plus, so it would be helpful with a hint about that too.

Noisemaker_koblingsskjema by Lars Krogh-Stea, on Flickr