Aftermarket Exhaust Options for GS1000G?

[moudis]

I have a 1980 GS1000G that is suffering from rust finally eating its way out through the bottom of both mufflers on the stock system. I've done some searching on the forum and it sounds like the various 8-valve motors can have exhausts swapped around, but the rear brackets and heat shields on stock systems might not line up.

I was looking at the aftermarket options, and Delkevic seems to be well liked here. They have systems for the GS1000, but nothing specifically for the -G. Does anyone have any experience with what modifications might need to be done (if any) to fit their system? An adapter for the hanger bracket?

[salty_monk]

I think you'll be fine with the Delkevic. I fitted one to an 1100G. You may have to fabricate a new rear bracket I would think....

I used to have a V&H 4:1 fitted to my 1000G. It was fine (with an adapter at rear). I also have 1000E system fitted to it for a while. Same thing... just needed an adapter at the back on each side.

[moudis]

Thanks for the info! If it’s just fabricating a bracket, I can manage that.

[Piers Pitcher]

I have the same issue with my 81 gs1000g and have been looking at various aftermarket options. Delkevic advise they do not advertise their 4 into 1 for the G model as the Rear brake lever interferes with the collector.
Would be interested to hear how others overcame this issue.

[moudis]

See the pictures linked below for pictures of my installation. A couple of things had to be changed to make this exhaust fit on my GS1000G. They were:

• The stock 45mm header bolts were too long, as the new flanges are much thinner. 35mm bolts were a good fit.
• The Delkevic bracket fouls the rear frame just barely. Spacing it out with two washers and giving it the slightest additional bend outward sufficed to make clearance.
• The brake lever can be adjusted, along with bending and spacing the rear bracket, to make just enough space. A warning: you may find this pedal adjustment to be too high for your taste, but it can be made to work. At full rear brake application, I can just barely see daylight between the pipe and lever.

You should be able to make it work with these modifications. A custom rear bracket that lowers the exhaust and creates the appropriate space from the rear frame would be the ideal solution, if you're looking for the perfect fit.

Image album: https://imgur.com/a/R1mT0S1

[rphillips]

Great info. Thanks and Congrats... Always loved those 1000G's, Kind'f wish I'd got another of them instead of my GSX1100G.

[Datsa Noydb]

I have a 1980 GS1000G that is suffering from rust finally eating its way out through the bottom of both mufflers on the stock system. I've done some searching on the forum and it sounds like the various 8-valve motors can have exhausts swapped around, but the rear brackets and heat shields on stock systems might not line up.

I was looking at the aftermarket options, and Delkevic seems to be well liked here. They have systems for the GS1000, but nothing specifically for the -G. Does anyone have any experience with what modifications might need to be done (if any) to fit their system? An adapter for the hanger bracket?

Nice to see that you have already accomplished your installation, but for those reading this for reference in the future, let me say (from personal experience) that the 850G and 1000G pipes are very similar, but the mounting bolts at the collars are ever-so-slightly differently spaced. I did not measure just how much, but the 1000 bolts are about 5-6mm farther apart. Just enough difference that the holes in the collars would have to be slotted to fit the other size engine.

[steve murdoch]

Thanks for the follow-up, moudis.

A lot of us, myself included, forget or don't bother to finish off our threads.