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I've had my KLX for 3 years. I do a lot of fairly fast single track, and always ride the bike there.
If I can offer any insight, it would be this,
I did the jetting, and carb mods first, including drilling the slide, a 300 needle, and removing the lid. This helped a lot. Next I did a Muzzy can, and that made a big difference. Removing the backfire screen made a far bigger difference than I expected. I'm not sure why, but maybe the air signal is stronger, and the slide opens faster, or maybe my jetting was a little off, and the extra airflow corrected it, but it was one of the mods that made a very significant difference. If I bought another one, it would be the first thing I did. The FMF header, and muffler were icing on the cake. I'm quite happy with the power now, but since the stock cams are quite mild, when i go after more power, cams will probably be next, followed by a 300 barrel, and piston.
With my bike, the way it is now, I was able to beat (barely) a KLX 300 with carb mods and FMF muffler in a drag race.
I am very happy with the bike.
My mods now
FMF Powerbomb header, and Q4 muffler
132 Main, N1TC needle, drilled slide
Airbox lid and backfire screen removed
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