New to me 09 KLX250s
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Junior Member
Joined: May 2019
Posts: 13
From: Western New York, south of Buffalo
1st Gear Member
Dominic,
Please think twice about taking the 1/2" drill bit to your muffler.
This was a common practice when these first came out and you'll find threads where 2006/07 owners did it with apparent regularity.
Then, later, you'll find the threads where those that did it said it made little to any difference in flow/performance, may have made it a little louder, and definitely destroyed the spark arrester, yielding the muffler illegal for off road use on most all public lands. The spark arrester on these bikes swirls the exhaust gasses and the drill bit destroys the swirling fins.
Look for that KLX300 system you mentioned, or a fairly priced FMF Q4, if you want to keep it quieter.
Please think twice about taking the 1/2" drill bit to your muffler.
This was a common practice when these first came out and you'll find threads where 2006/07 owners did it with apparent regularity.
Then, later, you'll find the threads where those that did it said it made little to any difference in flow/performance, may have made it a little louder, and definitely destroyed the spark arrester, yielding the muffler illegal for off road use on most all public lands. The spark arrester on these bikes swirls the exhaust gasses and the drill bit destroys the swirling fins.
Look for that KLX300 system you mentioned, or a fairly priced FMF Q4, if you want to keep it quieter.
I've read more posts and saw that mentioned a few times, so I have already decided against it. On the hunt for a 300 exhaust!!!
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Junior Member
Joined: May 2019
Posts: 13
From: Western New York, south of Buffalo
1st Gear Member
Not really, I did the math, the stock snorkel is really long about half the cross sectional of the air boot between the air box and the carb... can you say "restrictive"? I thought you could... The KDX200/220 snorkel is much shorter and virtually the same size as the air boot, much less restrictive.
The pipe will add a bit, but not a lot. I'd say take off the head pipe and grind the weld inside at the head end to get rid of the lumpy factory weld at that point, if I remember right I noticed that in the head pipe I have laying around. That will open up some of the restriction. The pipe is a bit small, calculations say 1.375" ID is what should be there, but still the problem for real flow is at the intake snorkel and that the pipe at the head is small. I have an aftermarket 300 pipe I need to install.
Doing the intake side of things helps starting and performance all through the range. The pipe really won't do as much as the intake modifications.
The pipe will add a bit, but not a lot. I'd say take off the head pipe and grind the weld inside at the head end to get rid of the lumpy factory weld at that point, if I remember right I noticed that in the head pipe I have laying around. That will open up some of the restriction. The pipe is a bit small, calculations say 1.375" ID is what should be there, but still the problem for real flow is at the intake snorkel and that the pipe at the head is small. I have an aftermarket 300 pipe I need to install.
Doing the intake side of things helps starting and performance all through the range. The pipe really won't do as much as the intake modifications.
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