Here is a tech article discussing the effects of flywheel mass (moment of inertia).
http://www.gasgasrider.org/html/flywheel_effect.html
F_G,
Like Ken mentions, you can add a flywheel weight to your existing 2K-2. The nut is removed and a new nut with integrated weight is installed. Your 2K-2 ignition remains as-is (i.e, no flywheel puller is needed).
A 10 to 14oz weight makes a noticeable difference in my opinion. However, my '07 EC250 has the 2K-3 and it "lugs" down very low without stalling compared to my old '01 XC250 with 2K-2 + 10oz weight.
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Matt
Current: 2009 Yamaha FZ1
Previous: 2001 GasGas TXT280, 2001 GasGas XC250, 2004 KTM 200EXC, 2007 GasGas EC250, 2007 Husqvarna SM610, 2008 Husqvarna WB165
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