will SM pipe fit the DRZ 400 E?


10 replies to this topic
  • Zapp22

Posted March 26, 2007 - 10:05 AM

#1

gang
I need to replace the can on my E model, just for cosmetic reasons. will the SM and S rear stage fit the E model? put another way, do they all have same exhaust system, stock, or different?
thx
z

  • William1

Posted March 26, 2007 - 10:29 AM

#2

No, not the same. The E header is larger. You can 'make it fit' if you must. The internals and flow characteristics are the same, however. Also, the mount at the foot peg area is different. A S/SM one afftaches to the passsenger footpeg bracket where as your E attaches to the bolt holes the foot peg bracket would be.

To make it fit with little work, you will have to fabricate your own 'gasket'. One thing you may be able to do (I am going to try to do this myself) is take the S muffler to an exhaust place and have them expand the connection to enable use of the stock E gasket.

  • supermotogreg

Posted March 26, 2007 - 01:49 PM

#3

I finally got curious enough yesterday to find out if an SM muffler could actually fit onto an E head pipe on my SM bike...

...so I did it.:bonk:

I removed 3/4 inch off the end of the head pipe with a rotary pipe cutter, used a rolled up strip of thin copper sheet as a gasket, and put the pipe on.

It took some jiggling around, but it fits on all of the original mounting points, and the gasket made a good tight seal.

The only unresolved issue is the pipe mounting holes don't line up with the holes in the heat shield, but I think that by slightly elongating the holes, I can get it to fit.

The short E muffler still fits the slightly shorter headpipe just fine with no leakage at the joint, so removing that little section of tubing made no difference.

The E and SM mufflers are identical inside, and flow exactly the same amount of exhaust.

The only differences are where the muffler attaches to the head pipe, and the location of the mid mount point.


Greg

  • William1

Posted March 26, 2007 - 02:00 PM

#4

Greg, since you have done so much messing about with stock pipes, confirm for me if you can. If A complete E system was installed on a S/SM, does the midpipe mount line up with the passenger footpeg bracket hole?
I have a bunch of pipes now, two complete S/SM systems and one complete E sytem.
I was going to modify a S muffler by expanding the joint, cut down the E header to fit, reweld the heatshield brackets. Or... Use a complete E system, move and reweld the midpipe mount. But I am thinking if... I can simply bore out the threaded hole in my SM sub frame and pass a properly sized bolt through to connect to the complete E system, I might do that.

Your thoughts?

  • supermotogreg

Posted March 26, 2007 - 03:00 PM

#5

Hey William, :naughty:

A full E system on an SM puts the mid mounting hole just aft of the rear footpeg mounting hole. Sorry, I don't have a closer picture. The other pipe is already on the bike now.

If you look at the red spring you can see the hex bolt that pins the mid mounting point onto the rear footpeg bracket. I've rode over 1,000 miles with the pipe mounted like that, and it has never loosened up or slipped off...
Posted Image

This is the SM muffler mounted onto the E head pipe...
Posted Image

Here's how the connection looks where the SM muffler attaches to the E head pipe. You can't tell they aren't stock matching parts. I still need to resolve the issue of the heatshield mounts...
Posted Image

...and had to reinstall the rear footpeg mount to provide a mounting point for the SM muffler. I think I'll make a simple aluminium bracket, so I can take off the footpeg bracket.
Posted Image

The bike sounds really mellow and deep. :bonk:

Take Care,


Greg

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  • William1

Posted March 26, 2007 - 03:30 PM

#6

Greg, thaks for the pictures and the benefit of your experience. I think I'll be using a S muffler, E header, and simply shorten the E header, Expand the S muffler joint to E size and move the heat shield mounts. Will not be done for a few months as I have several other projects in the works. Still looking for good quality Stainless Steel bungs and a source for Ti ones. Arghhh!

  • supermotogreg

Posted March 26, 2007 - 10:38 PM

#7

You're welcome, :naughty:

It's been a lot of fun following my interest and exerimenting with the various exhaust options. But I've ended up with a very narrow range of expertise. :bonk:

I'm not too sure that that the S joint will take much expanding, but you probably know more about metals than I do. A simple thin wrapped sheet copper gasket seals really well, and if you notice in the joint picture... the diameter of the E headpipe and SM muffler tubing is exactly the same for a nice clean undisturbed flow.

There is one problem with a super quiet free flowing exhaust like this...

I ride a LOT faster when there isn't hardly any exhaust noise... it's like flying a stealth fighter. :bonk:

The bike performs really well... I'm now doing mileage testing to see if there is any improvement in efficiency.

An S/SM muffler with an E headpipe works just fine...

...especially when you consider that S/SM exhausts are really common and dirt cheap! :D

Take Care,


Greg

  • npm

Posted March 28, 2007 - 01:37 PM

#8

I finally got curious enough yesterday to find out if an SM muffler could actually fit onto an E head pipe on my SM bike...

...so I did it.:bonk:

I removed 3/4 inch off the end of the head pipe with a rotary pipe cutter, used a rolled up strip of thin copper sheet as a gasket, and put the pipe on.

It took some jiggling around, but it fits on all of the original mounting points, and the gasket made a good tight seal.

The only unresolved issue is the pipe mounting holes don't line up with the holes in the heat shield, but I think that by slightly elongating the holes, I can get it to fit.


Greg


I had the same question about the heat shield a while back. It was pointed out to me the ring on the end of the s header fit inside the s muffler where the clamp is. If you look at the pictures above you will see the ring on the e header butts up against the s muffler where the clamp fits. I haven't done it yet but I plan to trim off a little of the part where the clamp fits to make the heat shield fit.

  • supermotogreg

Posted March 28, 2007 - 01:46 PM

#9

Hi np, :naughty:

Yeah... I didn't want to cut off any more off of the E headpipe than the minimum amount to make the SM muffler work...

...because I want to retain the interchangeability back to the shorty E muffler when I'm in a loud mood. :bonk:

Take Care,


Greg

  • Zapp22

Posted March 29, 2007 - 04:40 AM

#10

well, if any of you innovators have a decent E stocker can sitting around the garage, let me know. I need!

  • npm

Posted March 29, 2007 - 11:58 AM

#11

Hi 05xt225 greg,

Like you I cut down the e header thinking that would make it fit. When the heat shield still wouldn't line up I looked closer and found the remaining lenghth of head pipe should have easily let the pipe go in to the s muffler far enough. It was only when I was told about the ring at the end of the header needing to go into the s muffler instead of butt up against it did I realize I needed to do something about that problem.





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