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Old 03-04-2013, 05:30 PM   #1
darmahman OP
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exhaust system

In the past I have put several sets of Staintune's on my BMW's. (airheads)
Staintune no longer manufactures exhausts for the /7. The fit and finish was always perfect with them. I am interested in specifically the differences in quality and fit and finish to the Keihan's. I AM ONLY INTERESTED IN THAT COMPARISON. If you have knowledge of the differences or your experience with Keihan's I would like to hear your experiences but only with that brand. Thanks on the front side.
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Old 03-04-2013, 05:35 PM   #2
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What I've seen of the Keihan stuff has varied quite a bit. Sometimes they just don't fit up very cleanly, sometimes they do. The finish quality on all of it has been a step down from staintune stuff I've seen. The welds typically aren't the neatest.
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Old 03-04-2013, 05:56 PM   #3
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I have Keihan headers and collector on my R80G/S, and it was a bit of a fight to install everything.
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Old 03-04-2013, 08:40 PM   #4
Max Headroom
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I have bought two sets of Keihan silencers to date. The first set was their standard issue, intended as a direct replacement for /6 models and later. They are well made, nicely finished and are as quiet as the factory items. Having traveled only 15,000mi so far, they have years of life left in them and are currently on the shelf, awaiting their next assignment which is under construction. They were originally fitted to my R90S.

The second set arrived just under two years ago, purchased direct from Keihan. They are the "Jim Cray" sport silencers, developed by Jim with the aid of an R100/7 and a dyno. Probably similar to the Staintune Sport silencers in design and noise levels. It took quite a few miles to get used to the new sound, and initially I had reservations, but they have grown on me and I now like the deeper, more authoritative "voice" the R90S now has.

I'm happy with the quality of both sets, and won't hesitate to purchase another set of Keihan silencers for the /5 toaster I'll be re-assembling next year. My only observation is that they are prone to discolour, as many S/S exhaust systems are inclined to do. (Incidentally I also have a S/S header set of unknown origin or manufacture which don't discolour noticeably, which I find quite appealing. There are no markings or identification on them though, unfortunately.)

Everything fits together as it should, and at a glance, from a distance, the Keihans look just like stock. They come with a 10 year manufacturer's warranty, but you probably knew that.

No connection, YMMV etc
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Old 03-04-2013, 11:37 PM   #5
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I have Staintunes on now and a set of the Jim Cray designed Keihans in the shed. There was a LEO blitz on noise so I took 'em off for a while.

In the past, I've also had a set of the stock Keihans.

Fit was never a problem. Finish is good but Staintune is better.

The seam along the bottom of the Keihans is finished differently, hard to describe, but Staintune looks better there. Keihans do seem to discolour more, around the area before the weld in the region of the bracket. It polishes out easily enough.

Both sets of Keihans developed a small crack in the area where the bracket is. It doesn't seem to affect tune at all, but is a disappointment. They're half the price of the Staintunes, or were. I'd buy 'em again.




https://www.youtube.com/watch?v=pYGmE05H7SA

https://www.youtube.com/watch?v=xeQv-fO0-vY

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Old 03-04-2013, 11:46 PM   #6
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Quote:
Originally Posted by boxerboy81 View Post
I have Staintunes on now and a set of the Jim Cray designed Keihans in the shed. There was a LEO blitz on noise so I took 'em off for a while.

In the past, I've also had a set of the stock Keihans.

Fit was never a problem. Finish is good but Staintune is better.

The seam along the bottom of the Keihans is finished differently, hard to describe, but Staintune looks better there.

Both sets of Keihans developed a small crack in the area where the bracket is. It doesn't seem to affect tune at all, but is a disappointment. They're half the price of the Staintunes, or were. I'd buy 'em again.




https://www.youtube.com/watch?v=pYGmE05H7SA

https://www.youtube.com/watch?v=xeQv-fO0-vY
I am not claiming a cure all but keeping your front muffler clamps tight really cuts down on cracking there. I check all airheads I work on. It's easy. Reach down and grab the end of the muffler on twist on it. If you can twist it at all, the front clamp needs tightening. I find them loose ALL the time! A loose front clamp lets them vibrate a LOT compared to a tight one.

supershaft screwed with this post 03-05-2013 at 12:42 AM
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Old 03-05-2013, 02:33 AM   #7
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Steve,

Worth trying the Keihans 10yr Gtee? But you are a long way away. Also check that the little cross bracket on your pillion/exhaust mount is not cracked, they often are and can cause exhaust cracking.

I agree with Max on the Keihans, they seem to last forever and the ones I have fitted have all be sized properly.

The sports mufflers were built because of the Internet, Jim had been talking for a couple of years about getting some sports silencers made to his own design, I was on the Motobins forum at the time and put the word out so between forum members and Jim's own customers, we got the minimum number of orders together so that he could get them made. They look stock apart from the outlet that is of a larger diameter.

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Old 03-05-2013, 01:28 PM   #8
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Quote:
Originally Posted by chasbmw View Post
Steve,

Worth trying the Keihans 10yr Gtee? But you are a long way away. Also check that the little cross bracket on your pillion/exhaust mount is not cracked, they often are and can cause exhaust cracking.

I agree with Max on the Keihans, they seem to last forever and the ones I have fitted have all be sized properly.

The sports mufflers were built because of the Internet, Jim had been talking for a couple of years about getting some sports silencers made to his own design, I was on the Motobins forum at the time and put the word out so between forum members and Jim's own customers, we got the minimum number of orders together so that he could get them made. They look stock apart from the outlet that is of a larger diameter.

Those are very different from Staintune Sport mufflers. The Cray Keihans are a lot louder and freer flowing I know just from looking. Typically speaking, the perforated linings breath best but they are LOUD. They also tend to work best when tightly packed and the packing doesn't last forever.

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Old 03-05-2013, 05:12 PM   #9
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[QUOTE=chasbmw;20868464]Steve,

Worth trying the Keihans 10yr Gtee? But you are a long way away. Also check that the little cross bracket on your pillion/exhaust mount is not cracked, they often are and can cause exhaust cracking.

Well over 20 yrs I'v had my Keihan's on the outfit and they're superb. But they have both cracked in the pillion support area. I never thought that the omission of that little tab would be the cause. Of course both my tab's have broken off.
Other than welding, is there a Meccano fix for this?
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Old 03-09-2013, 10:51 AM   #10
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Quote:
Originally Posted by boxerboy81 View Post
I've watched those videos of your 1000 times before, thanx!

I noticed the Staintune seems to have a larger outlet than the Keihin. Did you notice that as well? The Staintune seems a little deeper in tone at idle.

The polish on the Staintune seems a little better than the Keihin.

I have the Keihin Mufflers, H-pipe, and I am getting ready to do the Headpipes.
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Old 03-09-2013, 11:41 PM   #11
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Originally Posted by Les_Garten View Post
I've watched those videos of your 1000 times before, thanx! Cheers

I noticed the Staintune seems to have a larger outlet than the Keihin. Did you notice that as well? No, I didn't unfortunately, nor did I measure them. I sold the stock Keihans so can't do that comparo. The Staintune exhaust has a 32.2mm diameter. The Staintune seems a little deeper in tone at idle.

The polish on the Staintune seems a little better than the Keihin. Yep, but the Keihans are ok. They do get some discolouration in the area under the foot, but that polishes out ok.



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Old 03-10-2013, 01:20 AM   #12
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I just measured my Keihins, they are 28.25mm
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Old 05-24-2013, 04:10 PM   #13
darmahman OP
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I put my new keihan "Jim Cray specials" up for sale. The bike feels and sounds like a hot rod when on but too loud for me. See this link in flea market:

http://www.advrider.com/forums/showthread.php?t=889828
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