Exhaust Chirping Sound - Kawasaki KLR 650 Forum
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post #1 of 16 Old 04-01-2008, 02:36 PM Thread Starter
 
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Exhaust Chirping Sound

I own a stock 2001 650 KLR that has now has 7,500 miles on it. In/around 6K I started hearing a high-pitched ticking/chirping-kind of sound coming from the stock exhaust pipe. The normal sound was more of a muffled patter, patter sound. I had the local shop take a look and they found nothing wrong wit the bike during it’s recent full service. They claimed that all these bikes make this high pitched sound and that I must have been lucky up until now. Go figure…

Has anyone else experienced a change in exhaust sound over time? Is there anything I can do to correct this without replacing the pipe?
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post #2 of 16 Old 04-01-2008, 02:42 PM
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It's called the TWEETY!....
Why does my bike sound like an old VW?
This is affectionately known as "tweety," and can happen to bikes anytime after a few thousand miles. It seems to appear earlier on bikes that are ridden on a lot of short trips, thereby allowing condensation to remain in the muffler. It also seems to be traced to clogging of the spark arrestor system. The noise is merely an annoyance; it will not damage your engine. Aside from replacing the exhaust system, you can try to fix it:

Take a huge straightblade screwdriver (like 12" shaft), and sharpen the end with a file. Look in the end of the exhaust, there is a small perforated pipe running from the opening to about 8" inside. It has a seam on the bottom (6:00 position) that may already be split open. Using the screwdriver and a hammer, drive the screwdriver into and along the seam, opening it up to within 1" of the end. Start the motor and listen for tweety. If it's still there, make another lengthwise slit at the 12:00 position, start the motor and check. Some people have had to make four slits (at 90 degree intervals) to fix the tweet.

Some bikes get it some don't.
Heres a link to a possible fix. http://www.klrforum.com/showthread.php?t=1985
It took about 70% of the tweet out of my buddies pipe. Of course we are running Jardine pipes now, so no more tweety anyway..

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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Last edited by DXKLR; 04-01-2008 at 02:46 PM.
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post #3 of 16 Old 04-01-2008, 02:43 PM
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Was looking at the miles on your bike. Have you done the doo yet, and have you checked the valves?

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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post #4 of 16 Old 04-01-2008, 03:40 PM
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I seem to remember a few pics with additional holes drilled in the rear muffler plate. Was that to kill the tweet or what? Does it help. Not a problem with mine yet, but .....
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post #5 of 16 Old 04-01-2008, 03:51 PM
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yeah the more holes the better, I had probably 10 holes in mine. My pipe had not started doing the tweety, but I thought I would be preventative and it seemed to work. I had 6100 miles on mine when I took it off and never once had a tweet. My buddies 05 had 2500 miles on it, and the thing sounded awful.

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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post #6 of 16 Old 04-02-2008, 03:58 PM
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I killed Tweety at around 4,000 miles.. Stuck a big screwdriver through his widdle head.. Tweety's been gone for 7,000 miles and I don't miss him at all..
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post #7 of 16 Old 04-02-2008, 04:18 PM
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Paper - you did the screwdriver mod and not the drill modor did you try the drill fix at all? tks.
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post #8 of 16 Old 04-02-2008, 06:55 PM
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Yep, just the hammer/screwdriver.. When I did mine a couple years ago, I didn't know about drilling the holes.

I found mine actually sounded just like my old BMW airhead twins, only louder. I just beat up the internal screen with a screwdriver and ended Tweety's life..
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post #9 of 16 Old 04-02-2008, 06:58 PM
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Hammer/screwdriver here also. I only opened up the 1 existing slot so far and it helped quite a bit, but it's not completely gone. Will open it some more eventually and should fix the rest of it I guess.

For those that are doing the holes, doesn't that change the overall exhaust note? Opening the slot hasn't done that so far.
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post #10 of 16 Old 04-02-2008, 07:10 PM
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If anything the exhaust note just got a slight bit deeper, but you would be hard pressed to know the difference if you were blindfolded and couldn't see the non hole pipe versus the one with holes and listening to them running.

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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Last edited by DXKLR; 04-03-2008 at 08:45 PM.
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