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4 into 2 pipes

  • Thread starter Thread starter 520eek
  • Start date Start date
I have a Mac system which is not the best (didn't care for muffler sound) but does make it possible to replace mufflers easily with something better sounding, which I did. Not a lot of systems available for our 850s.
 
what is the diameter of the header pipe where the muffler would attach?
I have thought of same idea, but it is rather spendy to order up and see if what you had in mind fits or not
 
unless of course, mufflers for GS1000s or GS750s would fit. not sure on that.
 
growler said:
unless of course, mufflers for GS1000s or GS750s would fit. not sure on that.
Click to expand...
"Mufflers" are not the entire issue. :-k

Most of our four-cylinder bikes have one pipe on each side that is continuous along the entire length from the engine all the way to the back. While the 1000G and the 850G do share the same frame, there are some subtle details in the exhaust systems. For example, the header flange bolts on the 1000 are just a bit farther apart than those on the 850. If you were to try to install a set of 1000G pipes on an 850G, you would have to slot the mounting holes inward (assuming there is enough room). After that, all the mounting points should line up.

The 8-valve 750s and the '79 850 had the same cylinder head, so the header bolts will line up, but I don't know if the rest of the mounts would work.

I have no experience with the chain-driven 1000's exhaust to be able to say whether the mounting points are similar.

.
 
JC Whitney carries a generic Dunstall replica muffler that should make a good replacement for the standard pipes as long as your header is OK.

I think AZR had some on his 79 850, check with him
 
understood. if my headers are ok, which i'm almost positive they are, i'd like to shorten the overall length of the muffler portion with an aftermarket muffler. i don't even know if i'm making sense. maybe incorrect terminology?

something like this:
http://www.youtube.com/watch?v=FvXlIzwZ2_Q

:confused:


Steve said:
"Mufflers" are not the entire issue. :-k

Most of our four-cylinder bikes have one pipe on each side that is continuous along the entire length from the engine all the way to the back. While the 1000G and the 850G do share the same frame, there are some subtle details in the exhaust systems. For example, the header flange bolts on the 1000 are just a bit farther apart than those on the 850. If you were to try to install a set of 1000G pipes on an 850G, you would have to slot the mounting holes inward (assuming there is enough room). After that, all the mounting points should line up.

The 8-valve 750s and the '79 850 had the same cylinder head, so the header bolts will line up, but I don't know if the rest of the mounts would work.

I have no experience with the chain-driven 1000's exhaust to be able to say whether the mounting points are similar.

.
Click to expand...
 
Not really aftermarket but I just welded up some 4 into 2's. Its actually a pair of 2 into 1's, but I think that's what you mean. I like the sound. What I did was use the stock headers and cut/angle/weld new pipe to some mufflers. Didn't have any clamps on hand so I welded the mufflers to the pipe as well. They are one piece from the header back and fit around the kick stand. Easy to remove.
 
Hi Steve. I also bought a 4 into two exhaust from Tranzac for my GS1000G. They look great, very similar to the original. Since the system was fitted I've had a few small issues. The bike shop at Hornsby who fitted the pipes (and did a great original paint job) had a lot of problems tunning the carbs, trying to get rid of a slight hesitation at around 2500 revs . They spent many ours on it, without charging me, but now when I'm accelerating at low speed (eg. roundabouts or intersections) there is a sudden surge. Occasionally I also get a bit of a splutter when accelerating hard.
Have you had any tuning issues ? Did you make any changes to the Carbs/jetting ? Mine is still original,
Norm
 
Brownford: have been looking for good set of standard exhaust but so far no luck, so the Tranzac pipes was the best option I could find in Aus. The fitted well and work ok for the riding I'm doing, Sunday rides up the blue mountains. 200k

AussieGS ,Hi Norm, I have rebuilt the carbs,adjusted shims as per the bass cliff info. Carbs have standard jetting ,so far no problems down low ,runs pretty clean through the rev range.

How is your air filter box?
Steve
 
gssteve said:
Brownford: have been looking for good set of standard exhaust but so far no luck, so the Tranzac pipes was the best option I could find in Aus. The fitted well and work ok for the riding I'm doing, Sunday rides up the blue mountains. 200k

AussieGS ,Hi Norm, I have rebuilt the carbs,adjusted shims as per the bass cliff info. Carbs have standard jetting ,so far no problems down low ,runs pretty clean through the rev range.

How is your air filter box?
Steve
Click to expand...

gssteve, Im presuming its all good due to the fact the carbs were pulled down and cleaned. They had issues with one of the idle screws and is almost off spring to get it right. They also said compression is down slightly, but not an issue. Also when I shut off the throttle on a downhill, there is a fair bit of loud crackle from the exhaust. I seem to remember my original 1000G in '81 was a lot smoother.
 
Norm
Have you checked the shims?
What compression do you have?

Mine mumbles a bit but no backfiring. Where in Sydney are you?

Steve
 
Steve
I haven't done any of the work on the engine, I trusted the guys at the shop to have covered. They are pretty good.
I'm on the Northern Beaches (Brookvale) and looking for a tuner that has experience with the GS. Most of the local guys don't want to know about it.
Norm
 
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