Exhaust Mods - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 
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post #1 of 5 Old 10-24-2012, 07:40 PM Thread Starter
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Join Date: Oct 2012
Location: Silver City, NM
Posts: 217
Exhaust Mods

Interesting. It's well known by now that I dis-like the lawnmower sound of the stock exhaust on my 2011....but hafta wait a bit for a new muffler.

I went ahead a bit ago and hole-sawed the end of the muffler and pulled out the 5" piece that's part of it. (some have spoken of it as being stainless, but mine definitely is not) Didn't have any problems with the hole saw, just kept the speed down, the pressure light and hit it intermittently - only cut 5 seconds or so, give a quick break and then some more - I've done a lot of this over the years. Hole saw is still sharp.

Several people have mentioned that after pulling that component they reached in with long nosed vice grips and pulled some other baffle. All I can see is way down there a part with what looks like angled vanes on it. You'd need some kind of extreme vice grips to reach that, so I fired it up for a listen......and was immediately glad I hadn't gone any farther.

Yes, the tone is deeper and sounds just right, but when accelerating it has a sharp bark that I don't like. Haven't had it for a real run yet, just a mile or so down the road and back and seems like it's a little stronger. We'll see.

Question - now that I have a common reference point, maybe someone can recommend a muffler for when the time comes. I like the deeper tone of this mod when just running along but don't like that sharp bark at all. Many of you have done or have seen this mod, so which aftermarket muffler would come close to doing what I'm asking here ??

Also, the last few days I've noticed a mild, intermittent backfiring when de-celerating. Is that a sign of tight valves ??

Thanks...........Lar.
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post #2 of 5 Old 10-24-2012, 09:10 PM
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Location: No. CA
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Quote:
Originally Posted by biglar

Also, the last few days I've noticed a mild, intermittent backfiring when de-celerating. Is that a sign of tight valves ??

Thanks...........Lar.
Have you done the .22 mod or anything else to the carb since opening the pipe up? My guess off hand is the bike is flowing better and running lean. Check the common mods thread, betting that will get rid of the backfire.

On the pipe, check YouTube and you may be able to get a sound sample for different pipes. Can't make any personal recommendations there, sorry. When/if you do any mods to richen up the fuel, be VERY CARFUL with the slide diaphram and reinstalling it. it is very delicate and will cause you a boatload of trouble if you tear or otherwise damage it. Don't ask me how I know...
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post #3 of 5 Old 10-24-2012, 10:01 PM Thread Starter
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Join Date: Oct 2012
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Quote:
Originally Posted by ArcticKLR View Post
Have you done the .22 mod or anything else to the carb since opening the pipe up? My guess off hand is the bike is flowing better and running lean. Check the common mods thread, betting that will get rid of the backfire.

On the pipe, check YouTube and you may be able to get a sound sample for different pipes. Can't make any personal recommendations there, sorry. When/if you do any mods to richen up the fuel, be VERY CARFUL with the slide diaphram and reinstalling it. it is very delicate and will cause you a boatload of trouble if you tear or otherwise damage it. Don't ask me how I know...
Thanks Arctic. It's been popping a bit on decel for several days. I haven't modified anything to do with the engine yet except the exhaust pipe this afternoon. Seems to me - much as I know - that living at 6,000 ft and the lower air pressure here, shouldn't that richen up the fuel mixture to begin with ??
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post #4 of 5 Old 10-24-2012, 10:35 PM
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Quote:
Originally Posted by biglar View Post
Thanks Arctic. It's been popping a bit on decel for several days. I haven't modified anything to do with the engine yet except the exhaust pipe this afternoon. Seems to me - much as I know - that living at 6,000 ft and the lower air pressure here, shouldn't that richen up the fuel mixture to begin with ??
Makes since that the altitude would richen the mix a bit, but considering that the bike comes lean from the factory you may have cancelled out whatever gains that you alt. may have helped you with by opening the flow. Not 100% sure, as I'm at just above sea level but I'm willing to bet someone else on here may have an idea how the altitude will affect adjustments and will most likely pop on sometime soon. Also, I think there are some threads on here regarding different alts and how they effect the bike. I know I'm seen a few discussions about it before, but my search isn't the best with my phone app. Might also google cvk40 and effects of altitude to help give a baseline for diagnosis. Since you are at a higher alt. you may just want to try a single washer if you choose to do it, then test it out for a bit. It is not a hard mod to do as long as you are careful with the diaphram.
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post #5 of 5 Old 11-25-2012, 09:26 PM
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Join Date: Nov 2012
Location: New Jersey
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I have a 2 brothers can that's too loud. Waiting for a power tip to come in and quick it down a little.
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