1981 gs750 (gs750e) Retro Racer project

[LarsKroghStea]

Finally passed the turning point, and the bike is getting together again

IMG_20180809_105244 by Lars Krogh-Stea, on Flickr

With the top breather cover off, the frame slid nicely over the engine.

IMG_20180809_110423 by Lars Krogh-Stea, on Flickr

After putting on the rear wheel and shocks it looks like half a bike already

IMG_20180809_150438 by Lars Krogh-Stea, on Flickr

Also refurbished some of the wires:

IMG_20180809_144438 by Lars Krogh-Stea, on Flickr

[storm 64]

Your motorcycle is looking great! Keep up the good work👍

[LarsKroghStea]

Thanks!

Here are some photos of my 520 conversion. The rear sprocket is for a Suzuki DR 750 and the front sprocket is for various 90's Kawasakis. The chain is a very narrow d.i.d chain.

Front first. The sprocket has a section which is 2.6mm wider as shown here:

IMG_20180809_171020 by Lars Krogh-Stea, on Flickr

On the inside of the sprocket I have 6mm spacer similar to the one you see between the sprocket and the nut. The reason I have a spacer on the outside is because I'm missing the retainer washer. It's in the mail.. When I had it mounted like this the chain was to close to the rear tire. I flipped the front sprocket and put two 1.3mm washers behind the rear sprocket. Now there is 7mm clearance between chain and tire. I believe that is enough. I will at least try it for a while. With this configuration I can also use the original rear sprocket bolts.

IMG_20180809_172232 by Lars Krogh-Stea, on Flickr



IMG_20180809_172737 by Lars Krogh-Stea, on Flickr


IMG_20180809_172701 by Lars Krogh-Stea, on Flickr

[steve murdoch]

Looks like at least a 3.5" rear wheel?
What swingarm is that?

[LarsKroghStea]

The wheel is 4.25'. The rim is laced to an original 1979 gs1000/750 hub with 6mm shorter spokes. The tire is 150/70-18. The swing arm is the original. If I put the axle all the way towards the front of the adjustment range the tire is too close to the swing arm. It needs to be about two cm towards the rear, but that's normal anywhay, I think.

[LarsKroghStea]

Trying to get a little bit done each day.. today I dismantled the fork and painted them.

Fork by Lars Krogh-Stea, on Flickr

Fork by Lars Krogh-Stea, on Flickr

[LarsKroghStea]

And here it is with rubber booth installed.


Fork with booth by Lars Krogh-Stea, on Flickr

[LightsOut]

Very nice fab work in this build! It's a great feeling passing the turning point when you start reassembling
What happened to the gsxr forks though? Going with the original forks instead?

Lykke til med prosjektet från Sverige

[LarsKroghStea]

Takk så mycket�� I'm going for a Cognito Moto wheel conversion for the gsxr front, so that will be a project for the winter. Dollar is expensive at the moment, and with postage and vat and everything that will amount to about 10.000,- Norwegian kroner. So I'll do everything else first.

[LarsKroghStea]

Full by Lars Krogh-Stea, on Flickr

This bend and silencer came today. Almost a good match I'll have to use some force to get them to fit..

Inni by Lars Krogh-Stea, on Flickr

Mellomstykke by Lars Krogh-Stea, on Flickr


Extra by Lars Krogh-Stea, on Flickr

Have no idea what those two extra parts are.. Looks like a dbkiller but doesnt fit anywhere.. came with the silencer.

[limeex2]

Is the muffler off of E-Bay?

[John Kat]

Where did you get the muffler?
I have a bike with a Devil exhaust and I wonder if this would fit?
What's the inner diameter of the muffler?
Ideally it should be around 75 to 78 mm!

[LarsKroghStea]

https://www.ebay.com/itm/61mm-Black-Universal-Motorcycle-Stainless-Exhaust-Muffler-Pipe-ATV-300mm-Kit/273372477695?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

This is the one. I was looking for 63mm in size, but i think this is the biggest. You could use something like this if you coud find it with the right measurements:

https://www.ebay.com/itm/Motorcycle-Exhaust-Adapter-Reducer-Connector-Sleeve-Pipe-61-51mm-2-4-2/153128454798?hash=item23a72aca8e:g:dL8AAOSwvAhbZ7C8

[John Kat]

https://www.ebay.com/itm/61mm-Black-...72.m2749.l2649

This is the one. I was looking for 63mm in size, but i think this is the biggest. You could use something like this if you coud find it with the right measurements:

https://www.ebay.com/itm/Motorcycle-...8AAOSwvAhbZ7C8

Many thanks!
I can tell you that my Devil muffler looks identical from a fabrication standpoint and I didn't even try it without a dB killer and it's still loud !

[LarsKroghStea]

Tried to make the tube at the end a little wider by hammering a stepped tube inside it. This clipped two of te rivets holding the muffler together. I drilled out the last one and took it apart.

Clipped rivet by Lars Krogh-Stea, on Flickr

Stuffing by Lars Krogh-Stea, on Flickr

Hammered lightly on the inner ring to set the pieces together.

Separated by Lars Krogh-Stea, on Flickr

Put it back together with new pop rivets. From now I'll treat the two parts as one and mask off the bend before I powdercoat the muffler.

Back together by Lars Krogh-Stea, on Flickr